Changes with nginx 1.3.9 27 Nov 2012v1.3.9

*) Feature: support for chunked transfer encoding while reading client
request body.

*) Feature: the $request_time and $msec variables can now be used not
only in the "log_format" directive.

*) Bugfix: cache manager and cache loader processes might not be able to
start if more than 512 listen sockets were used.

*) Bugfix: in the ngx_http_dav_module.

24 files changed, 1119 insertions, 545 deletions

diff --git a/CHANGES b/CHANGES
index da414ef92..013350ba7 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,18 @@
 
+Changes with nginx 1.3.9                                         27 Nov 2012
+
+    *) Feature: support for chunked transfer encoding while reading client
+       request body.
+
+    *) Feature: the $request_time and $msec variables can now be used not
+       only in the "log_format" directive.
+
+    *) Bugfix: cache manager and cache loader processes might not be able to
+       start if more than 512 listen sockets were used.
+
+    *) Bugfix: in the ngx_http_dav_module.
+
+
 Changes with nginx 1.3.8                                         30 Oct 2012
 
     *) Feature: the "optional_no_ca" parameter of the "ssl_verify_client"
diff --git a/CHANGES.ru b/CHANGES.ru
index e1c1bc93d..568cea2e7 100644
--- a/CHANGES.ru
+++ b/CHANGES.ru
@@ -1,4 +1,18 @@
 
+Изменения в nginx 1.3.9                                           27.11.2012
+
+    *) Добавление: поддержка chunked transfer encoding при получении тела
+       запроса.
+
+    *) Добавление: переменные $request_time и $msec теперь можно
+       использовать не только в директиве log_format.
+
+    *) Исправление: cache manager и cache loader могли не запускаться, если
+       использовалось более 512 listen-сокетов.
+
+    *) Исправление: в модуле ngx_http_dav_module.
+
+
 Изменения в nginx 1.3.8                                           30.10.2012
 
     *) Добавление: параметр optional_no_ca директивы ssl_verify_client.
diff --git a/src/core/nginx.h b/src/core/nginx.h
index df247dffc..58a4b1d16 100644
--- a/src/core/nginx.h
+++ b/src/core/nginx.h
@@ -9,8 +9,8 @@
 #define _NGINX_H_INCLUDED_
 
 
-#define nginx_version      1003008
-#define NGINX_VERSION      "1.3.8"
+#define nginx_version      1003009
+#define NGINX_VERSION      "1.3.9"
 #define NGINX_VER          "nginx/" NGINX_VERSION
 
 #define NGINX_VAR          "NGINX"
diff --git a/src/core/ngx_connection.c b/src/core/ngx_connection.c
index 660e0af4a..c818114df 100644
--- a/src/core/ngx_connection.c
+++ b/src/core/ngx_connection.c
@@ -749,6 +749,8 @@ ngx_close_listening_sockets(ngx_cycle_t *cycle)
 
         ls[i].fd = (ngx_socket_t) -1;
     }
+
+    cycle->listening.nelts = 0;
 }
 
 
diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
index f15372990..e8b155921 100644
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -447,7 +447,9 @@ ngx_init_cycle(ngx_cycle_t *old_cycle)
                 continue;
             }
 
-            if (shm_zone[i].shm.size == oshm_zone[n].shm.size) {
+            if (shm_zone[i].tag == oshm_zone[n].tag
+                && shm_zone[i].shm.size == oshm_zone[n].shm.size)
+            {
                 shm_zone[i].shm.addr = oshm_zone[n].shm.addr;
 
                 if (shm_zone[i].init(&shm_zone[i], oshm_zone[n].data)
diff --git a/src/core/ngx_shmtx.c b/src/core/ngx_shmtx.c
index 6cf7af58a..a62999f33 100644
--- a/src/core/ngx_shmtx.c
+++ b/src/core/ngx_shmtx.c
@@ -117,11 +117,11 @@ ngx_shmtx_lock(ngx_shmtx_t *mtx)
                                   "sem_wait() failed while waiting on shmtx");
                     break;
                 }
-
-                ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
-                               "shmtx awoke");
             }
 
+            ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
+                           "shmtx awoke");
+
             continue;
         }
 
diff --git a/src/http/modules/ngx_http_dav_module.c b/src/http/modules/ngx_http_dav_module.c
index dbb17ac30..a97c60e44 100644
--- a/src/http/modules/ngx_http_dav_module.c
+++ b/src/http/modules/ngx_http_dav_module.c
@@ -209,6 +209,11 @@ ngx_http_dav_put_handler(ngx_http_request_t *r)
     ngx_ext_rename_file_t     ext;
     ngx_http_dav_loc_conf_t  *dlcf;
 
+    if (r->request_body == NULL || r->request_body->temp_file == NULL) {
+        ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
+        return;
+    }
+
     ngx_http_map_uri_to_path(r, &path, &root, 0);
 
     path.len--;
diff --git a/src/http/modules/ngx_http_gunzip_filter_module.c b/src/http/modules/ngx_http_gunzip_filter_module.c
index b73fe4859..d4e41e4a0 100644
--- a/src/http/modules/ngx_http_gunzip_filter_module.c
+++ b/src/http/modules/ngx_http_gunzip_filter_module.c
@@ -165,6 +165,7 @@ ngx_http_gunzip_header_filter(ngx_http_request_t *r)
 
     ngx_http_clear_content_length(r);
     ngx_http_clear_accept_ranges(r);
+    ngx_http_clear_etag(r);
 
     return ngx_http_next_header_filter(r);
 }
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 387f77f9b..b1b8f46da 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -81,12 +81,9 @@ typedef struct {
 
 typedef struct {
     ngx_http_status_t              status;
+    ngx_http_chunked_t             chunked;
     ngx_http_proxy_vars_t          vars;
-    size_t                         internal_body_length;
-
-    ngx_uint_t                     state;
-    off_t                          size;
-    off_t                          length;
+    off_t                          internal_body_length;
 
     ngx_uint_t                     head;  /* unsigned  head:1 */
 } ngx_http_proxy_ctx_t;
@@ -558,6 +555,8 @@ static char  ngx_http_proxy_version_11[] = " HTTP/1.1" CRLF;
 static ngx_keyval_t  ngx_http_proxy_headers[] = {
     { ngx_string("Host"), ngx_string("$proxy_host") },
     { ngx_string("Connection"), ngx_string("close") },
+    { ngx_string("Content-Length"), ngx_string("$proxy_internal_body_length") },
+    { ngx_string("Transfer-Encoding"), ngx_string("") },
     { ngx_string("Keep-Alive"), ngx_string("") },
     { ngx_string("Expect"), ngx_string("") },
     { ngx_string("Upgrade"), ngx_string("") },
@@ -583,6 +582,8 @@ static ngx_str_t  ngx_http_proxy_hide_headers[] = {
 static ngx_keyval_t  ngx_http_proxy_cache_headers[] = {
     { ngx_string("Host"), ngx_string("$proxy_host") },
     { ngx_string("Connection"), ngx_string("close") },
+    { ngx_string("Content-Length"), ngx_string("$proxy_internal_body_length") },
+    { ngx_string("Transfer-Encoding"), ngx_string("") },
     { ngx_string("Keep-Alive"), ngx_string("") },
     { ngx_string("Expect"), ngx_string("") },
     { ngx_string("Upgrade"), ngx_string("") },
@@ -1006,6 +1007,9 @@ ngx_http_proxy_create_request(ngx_http_request_t *r)
 
         ctx->internal_body_length = body_len;
         len += body_len;
+
+    } else {
+        ctx->internal_body_length = r->headers_in.content_length_n;
     }
 
     le.ip = plcf->headers_set_len->elts;
@@ -1252,7 +1256,7 @@ ngx_http_proxy_reinit_request(ngx_http_request_t *r)
     ctx->status.count = 0;
     ctx->status.start = NULL;
     ctx->status.end = NULL;
-    ctx->state = 0;
+    ctx->chunked.state = 0;
 
     r->upstream->process_header = ngx_http_proxy_process_status_line;
     r->upstream->pipe->input_filter = ngx_http_proxy_copy_filter;
@@ -1617,265 +1621,6 @@ ngx_http_proxy_copy_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
 }
 
 
-static ngx_inline ngx_int_t
-ngx_http_proxy_parse_chunked(ngx_http_request_t *r, ngx_buf_t *buf)
-{
-    u_char                *pos, ch, c;
-    ngx_int_t              rc;
-    ngx_http_proxy_ctx_t  *ctx;
-    enum {
-        sw_chunk_start = 0,
-        sw_chunk_size,
-        sw_chunk_extension,
-        sw_chunk_extension_almost_done,
-        sw_chunk_data,
-        sw_after_data,
-        sw_after_data_almost_done,
-        sw_last_chunk_extension,
-        sw_last_chunk_extension_almost_done,
-        sw_trailer,
-        sw_trailer_almost_done,
-        sw_trailer_header,
-        sw_trailer_header_almost_done
-    } state;
-
-    ctx = ngx_http_get_module_ctx(r, ngx_http_proxy_module);
-
-    if (ctx == NULL) {
-        return NGX_ERROR;
-    }
-
-    state = ctx->state;
-
-    if (state == sw_chunk_data && ctx->size == 0) {
-        state = sw_after_data;
-    }
-
-    rc = NGX_AGAIN;
-
-    for (pos = buf->pos; pos < buf->last; pos++) {
-
-        ch = *pos;
-
-        ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
-                       "http proxy chunked byte: %02Xd s:%d", ch, state);
-
-        switch (state) {
-
-        case sw_chunk_start:
-            if (ch >= '0' && ch <= '9') {
-                state = sw_chunk_size;
-                ctx->size = ch - '0';
-                break;
-            }
-
-            c = (u_char) (ch | 0x20);
-
-            if (c >= 'a' && c <= 'f') {
-                state = sw_chunk_size;
-                ctx->size = c - 'a' + 10;
-                break;
-            }
-
-            goto invalid;
-
-        case sw_chunk_size:
-            if (ch >= '0' && ch <= '9') {
-                ctx->size = ctx->size * 16 + (ch - '0');
-                break;
-            }
-
-            c = (u_char) (ch | 0x20);
-
-            if (c >= 'a' && c <= 'f') {
-                ctx->size = ctx->size * 16 + (c - 'a' + 10);
-                break;
-            }
-
-            if (ctx->size == 0) {
-
-                switch (ch) {
-                case CR:
-                    state = sw_last_chunk_extension_almost_done;
-                    break;
-                case LF:
-                    state = sw_trailer;
-                    break;
-                case ';':
-                case ' ':
-                case '\t':
-                    state = sw_last_chunk_extension;
-                    break;
-                default:
-                    goto invalid;
-                }
-
-                break;
-            }
-
-            switch (ch) {
-            case CR:
-                state = sw_chunk_extension_almost_done;
-                break;
-            case LF:
-                state = sw_chunk_data;
-                break;
-            case ';':
-            case ' ':
-            case '\t':
-                state = sw_chunk_extension;
-                break;
-            default:
-                goto invalid;
-            }
-
-            break;
-
-        case sw_chunk_extension:
-            switch (ch) {
-            case CR:
-                state = sw_chunk_extension_almost_done;
-                break;
-            case LF:
-                state = sw_chunk_data;
-            }
-            break;
-
-        case sw_chunk_extension_almost_done:
-            if (ch == LF) {
-                state = sw_chunk_data;
-                break;
-            }
-            goto invalid;
-
-        case sw_chunk_data:
-            rc = NGX_OK;
-            goto data;
-
-        case sw_after_data:
-            switch (ch) {
-            case CR:
-                state = sw_after_data_almost_done;
-                break;
-            case LF:
-                state = sw_chunk_start;
-            }
-            break;
-
-        case sw_after_data_almost_done:
-            if (ch == LF) {
-                state = sw_chunk_start;
-                break;
-            }
-            goto invalid;
-
-        case sw_last_chunk_extension:
-            switch (ch) {
-            case CR:
-                state = sw_last_chunk_extension_almost_done;
-                break;
-            case LF:
-                state = sw_trailer;
-            }
-            break;
-
-        case sw_last_chunk_extension_almost_done:
-            if (ch == LF) {
-                state = sw_trailer;
-                break;
-            }
-            goto invalid;
-
-        case sw_trailer:
-            switch (ch) {
-            case CR:
-                state = sw_trailer_almost_done;
-                break;
-            case LF:
-                goto done;
-            default:
-                state = sw_trailer_header;
-            }
-            break;
-
-        case sw_trailer_almost_done:
-            if (ch == LF) {
-                goto done;
-            }
-            goto invalid;
-
-        case sw_trailer_header:
-            switch (ch) {
-            case CR:
-                state = sw_trailer_header_almost_done;
-                break;
-            case LF:
-                state = sw_trailer;
-            }
-            break;
-
-        case sw_trailer_header_almost_done:
-            if (ch == LF) {
-                state = sw_trailer;
-                break;
-            }
-            goto invalid;
-
-        }
-    }
-
-data:
-
-    ctx->state = state;
-    buf->pos = pos;
-
-    switch (state) {
-
-    case sw_chunk_start:
-        ctx->length = 3 /* "0" LF LF */;
-        break;
-    case sw_chunk_size:
-        ctx->length = 2 /* LF LF */
-                      + (ctx->size ? ctx->size + 4 /* LF "0" LF LF */ : 0);
-        break;
-    case sw_chunk_extension:
-    case sw_chunk_extension_almost_done:
-        ctx->length = 1 /* LF */ + ctx->size + 4 /* LF "0" LF LF */;
-        break;
-    case sw_chunk_data:
-        ctx->length = ctx->size + 4 /* LF "0" LF LF */;
-        break;
-    case sw_after_data:
-    case sw_after_data_almost_done:
-        ctx->length = 4 /* LF "0" LF LF */;
-        break;
-    case sw_last_chunk_extension:
-    case sw_last_chunk_extension_almost_done:
-        ctx->length = 2 /* LF LF */;
-        break;
-    case sw_trailer:
-    case sw_trailer_almost_done:
-        ctx->length = 1 /* LF */;
-        break;
-    case sw_trailer_header:
-    case sw_trailer_header_almost_done:
-        ctx->length = 2 /* LF LF */;
-        break;
-
-    }
-
-    return rc;
-
-done:
-
-    return NGX_DONE;
-
-invalid:
-
-    return NGX_ERROR;
-}
-
-
 static ngx_int_t
 ngx_http_proxy_chunked_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
 {
@@ -1901,7 +1646,7 @@ ngx_http_proxy_chunked_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
 
     for ( ;; ) {
 
-        rc = ngx_http_proxy_parse_chunked(r, buf);
+        rc = ngx_http_parse_chunked(r, buf, &ctx->chunked);
 
         if (rc == NGX_OK) {
 
@@ -1952,16 +1697,16 @@ ngx_http_proxy_chunked_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
             ngx_log_debug2(NGX_LOG_DEBUG_EVENT, p->log, 0,
                            "input buf #%d %p", b->num, b->pos);
 
-            if (buf->last - buf->pos >= ctx->size) {
+            if (buf->last - buf->pos >= ctx->chunked.size) {
 
-                buf->pos += ctx->size;
+                buf->pos += ctx->chunked.size;
                 b->last = buf->pos;
-                ctx->size = 0;
+                ctx->chunked.size = 0;
 
                 continue;
             }
 
-            ctx->size -= buf->last - buf->pos;
+            ctx->chunked.size -= buf->last - buf->pos;
             buf->pos = buf->last;
             b->last = buf->last;
 
@@ -1982,7 +1727,7 @@ ngx_http_proxy_chunked_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
 
             /* set p->length, minimal amount of data we want to see */
 
-            p->length = ctx->length;
+            p->length = ctx->chunked.length;
 
             break;
         }
@@ -1997,7 +1742,7 @@ ngx_http_proxy_chunked_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http proxy chunked state %d, length %d",
-                   ctx->state, p->length);
+                   ctx->chunked.state, p->length);
 
     if (b) {
         b->shadow = buf;
@@ -2094,7 +1839,7 @@ ngx_http_proxy_non_buffered_chunked_filter(void *data, ssize_t bytes)
 
     for ( ;; ) {
 
-        rc = ngx_http_proxy_parse_chunked(r, buf);
+        rc = ngx_http_parse_chunked(r, buf, &ctx->chunked);
 
         if (rc == NGX_OK) {
 
@@ -2116,13 +1861,13 @@ ngx_http_proxy_non_buffered_chunked_filter(void *data, ssize_t bytes)
             b->pos = buf->pos;
             b->tag = u->output.tag;
 
-            if (buf->last - buf->pos >= ctx->size) {
-                buf->pos += ctx->size;
+            if (buf->last - buf->pos >= ctx->chunked.size) {
+                buf->pos += ctx->chunked.size;
                 b->last = buf->pos;
-                ctx->size = 0;
+                ctx->chunked.size = 0;
 
             } else {
-                ctx->size -= buf->last - buf->pos;
+                ctx->chunked.size -= buf->last - buf->pos;
                 buf->pos = buf->last;
                 b->last = buf->last;
             }
@@ -2301,7 +2046,7 @@ ngx_http_proxy_internal_body_length_variable(ngx_http_request_t *r,
 
     ctx = ngx_http_get_module_ctx(r, ngx_http_proxy_module);
 
-    if (ctx == NULL) {
+    if (ctx == NULL || ctx->internal_body_length < 0) {
         v->not_found = 1;
         return NGX_OK;
     }
@@ -2310,13 +2055,13 @@ ngx_http_proxy_internal_body_length_variable(ngx_http_request_t *r,
     v->no_cacheable = 0;
     v->not_found = 0;
 
-    v->data = ngx_pnalloc(r->connection->pool, NGX_SIZE_T_LEN);
+    v->data = ngx_pnalloc(r->connection->pool, NGX_OFF_T_LEN);
 
     if (v->data == NULL) {
         return NGX_ERROR;
     }
 
-    v->len = ngx_sprintf(v->data, "%uz", ctx->internal_body_length) - v->data;
+    v->len = ngx_sprintf(v->data, "%O", ctx->internal_body_length) - v->data;
 
     return NGX_OK;
 }
@@ -3084,8 +2829,6 @@ ngx_http_proxy_merge_headers(ngx_conf_t *cf, ngx_http_proxy_loc_conf_t *conf,
     }
 
     if (conf->headers_set_hash.buckets
-        && ((conf->body_source.data == NULL)
-            == (prev->body_source.data == NULL))
 #if (NGX_HTTP_CACHE)
         && ((conf->upstream.cache == NULL) == (prev->upstream.cache == NULL))
 #endif
@@ -3168,16 +2911,6 @@ ngx_http_proxy_merge_headers(ngx_conf_t *cf, ngx_http_proxy_loc_conf_t *conf,
         h++;
     }
 
-    if (conf->body_source.data) {
-        s = ngx_array_push(&headers_merged);
-        if (s == NULL) {
-            return NGX_ERROR;
-        }
-
-        ngx_str_set(&s->key, "Content-Length");
-        ngx_str_set(&s->value, "$proxy_internal_body_length");
-    }
-
 
     src = headers_merged.elts;
     for (i = 0; i < headers_merged.nelts; i++) {
diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c
index bf0cb8a9c..2c825fa3a 100644
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -533,10 +533,11 @@ ngx_http_scgi_create_key(ngx_http_request_t *r)
 static ngx_int_t
 ngx_http_scgi_create_request(ngx_http_request_t *r)
 {
+    off_t                         content_length_n;
     u_char                        ch, *key, *val, *lowcase_key;
     size_t                        len, key_len, val_len, allocated;
     ngx_buf_t                    *b;
-    ngx_str_t                    *content_length;
+    ngx_str_t                     content_length;
     ngx_uint_t                    i, n, hash, skip_empty, header_params;
     ngx_chain_t                  *cl, *body;
     ngx_list_part_t              *part;
@@ -545,12 +546,20 @@ ngx_http_scgi_create_request(ngx_http_request_t *r)
     ngx_http_script_engine_t      e, le;
     ngx_http_scgi_loc_conf_t     *scf;
     ngx_http_script_len_code_pt   lcode;
-    static ngx_str_t              zero = ngx_string("0");
+    u_char                        buffer[NGX_OFF_T_LEN];
 
-    content_length = r->headers_in.content_length ?
-                         &r->headers_in.content_length->value : &zero;
+    content_length_n = 0;
+    body = r->upstream->request_bufs;
 
-    len = sizeof("CONTENT_LENGTH") + content_length->len + 1;
+    while (body) {
+        content_length_n += ngx_buf_size(body->buf);
+        body = body->next;
+    }
+
+    content_length.data = buffer;
+    content_length.len = ngx_sprintf(buffer, "%O", content_length_n) - buffer;
+
+    len = sizeof("CONTENT_LENGTH") + content_length.len + 1;
 
     header_params = 0;
     ignored = NULL;
@@ -672,11 +681,8 @@ ngx_http_scgi_create_request(ngx_http_request_t *r)
 
     cl->buf = b;
 
-    b->last = ngx_snprintf(b->last,
-                           NGX_SIZE_T_LEN + 1 + sizeof("CONTENT_LENGTH")
-                           + NGX_OFF_T_LEN + 1,
-                           "%ui:CONTENT_LENGTH%Z%V%Z",
-                           len, content_length);
+    b->last = ngx_sprintf(b->last, "%ui:CONTENT_LENGTH%Z%V%Z",
+                          len, &content_length);
 
     if (scf->params_len) {
         ngx_memzero(&e, sizeof(ngx_http_script_engine_t));
diff --git a/src/http/modules/perl/nginx.pm b/src/http/modules/perl/nginx.pm
index 75f00d531..73989c8c3 100644
--- a/src/http/modules/perl/nginx.pm
+++ b/src/http/modules/perl/nginx.pm
@@ -50,7 +50,7 @@ our @EXPORT = qw(
     HTTP_INSUFFICIENT_STORAGE
 );
 
-our $VERSION = '1.3.8';
+our $VERSION = '1.3.9';
 
 require XSLoader;
 XSLoader::load('nginx', $VERSION);
diff --git a/src/http/ngx_http.h b/src/http/ngx_http.h
index f152006a0..f1d02bdd2 100644
--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -18,6 +18,7 @@ typedef struct ngx_http_upstream_s    ngx_http_upstream_t;
 typedef struct ngx_http_cache_s       ngx_http_cache_t;
 typedef struct ngx_http_file_cache_s  ngx_http_file_cache_t;
 typedef struct ngx_http_log_ctx_s     ngx_http_log_ctx_t;
+typedef struct ngx_http_chunked_s     ngx_http_chunked_t;
 
 typedef ngx_int_t (*ngx_http_header_handler_pt)(ngx_http_request_t *r,
     ngx_table_elt_t *h, ngx_uint_t offset);
@@ -52,6 +53,13 @@ struct ngx_http_log_ctx_s {
 };
 
 
+struct ngx_http_chunked_s {
+    ngx_uint_t           state;
+    off_t                size;
+    off_t                length;
+};
+
+
 typedef struct {
     ngx_uint_t           http_version;
     ngx_uint_t           code;
@@ -92,6 +100,8 @@ ngx_int_t ngx_http_arg(ngx_http_request_t *r, u_char *name, size_t len,
     ngx_str_t *value);
 void ngx_http_split_args(ngx_http_request_t *r, ngx_str_t *uri,
     ngx_str_t *args);
+ngx_int_t ngx_http_parse_chunked(ngx_http_request_t *r, ngx_buf_t *b,
+    ngx_http_chunked_t *ctx);
 
 
 ngx_int_t ngx_http_find_server_conf(ngx_http_request_t *r);
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 826e4e5b5..faecaddc4 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -848,7 +848,8 @@ ngx_http_handler(ngx_http_request_t *r)
             break;
         }
 
-        r->lingering_close = (r->headers_in.content_length_n > 0);
+        r->lingering_close = (r->headers_in.content_length_n > 0
+                              || r->headers_in.chunked);
         r->phase_handler = 0;
 
     } else {
diff --git a/src/http/ngx_http_header_filter_module.c b/src/http/ngx_http_header_filter_module.c
index 1e01c857d..e3efbba5b 100644
--- a/src/http/ngx_http_header_filter_module.c
+++ b/src/http/ngx_http_header_filter_module.c
@@ -112,7 +112,7 @@ static ngx_str_t ngx_http_status_lines[] = {
 #define NGX_HTTP_OFF_5XX   (NGX_HTTP_LAST_4XX - 400 + NGX_HTTP_OFF_4XX)
 
     ngx_string("500 Internal Server Error"),
-    ngx_string("501 Method Not Implemented"),
+    ngx_string("501 Not Implemented"),
     ngx_string("502 Bad Gateway"),
     ngx_string("503 Service Temporarily Unavailable"),
     ngx_string("504 Gateway Time-out"),
diff --git a/src/http/ngx_http_parse.c b/src/http/ngx_http_parse.c
index be750edd0..a6ee74ecf 100644
--- a/src/http/ngx_http_parse.c
+++ b/src/http/ngx_http_parse.c
@@ -1818,3 +1818,259 @@ ngx_http_split_args(ngx_http_request_t *r, ngx_str_t *uri, ngx_str_t *args)
         args->len = 0;
     }
 }
+
+
+ngx_int_t
+ngx_http_parse_chunked(ngx_http_request_t *r, ngx_buf_t *b,
+    ngx_http_chunked_t *ctx)
+{
+    u_char     *pos, ch, c;
+    ngx_int_t   rc;
+    enum {
+        sw_chunk_start = 0,
+        sw_chunk_size,
+        sw_chunk_extension,
+        sw_chunk_extension_almost_done,
+        sw_chunk_data,
+        sw_after_data,
+        sw_after_data_almost_done,
+        sw_last_chunk_extension,
+        sw_last_chunk_extension_almost_done,
+        sw_trailer,
+        sw_trailer_almost_done,
+        sw_trailer_header,
+        sw_trailer_header_almost_done
+    } state;
+
+    state = ctx->state;
+
+    if (state == sw_chunk_data && ctx->size == 0) {
+        state = sw_after_data;
+    }
+
+    rc = NGX_AGAIN;
+
+    for (pos = b->pos; pos < b->last; pos++) {
+
+        ch = *pos;
+
+        ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                       "http chunked byte: %02Xd s:%d", ch, state);
+
+        switch (state) {
+
+        case sw_chunk_start:
+            if (ch >= '0' && ch <= '9') {
+                state = sw_chunk_size;
+                ctx->size = ch - '0';
+                break;
+            }
+
+            c = (u_char) (ch | 0x20);
+
+            if (c >= 'a' && c <= 'f') {
+                state = sw_chunk_size;
+                ctx->size = c - 'a' + 10;
+                break;
+            }
+
+            goto invalid;
+
+        case sw_chunk_size:
+            if (ch >= '0' && ch <= '9') {
+                ctx->size = ctx->size * 16 + (ch - '0');
+                break;
+            }
+
+            c = (u_char) (ch | 0x20);
+
+            if (c >= 'a' && c <= 'f') {
+                ctx->size = ctx->size * 16 + (c - 'a' + 10);
+                break;
+            }
+
+            if (ctx->size == 0) {
+
+                switch (ch) {
+                case CR:
+                    state = sw_last_chunk_extension_almost_done;
+                    break;
+                case LF:
+                    state = sw_trailer;
+                    break;
+                case ';':
+                case ' ':
+                case '\t':
+                    state = sw_last_chunk_extension;
+                    break;
+                default:
+                    goto invalid;
+                }
+
+                break;
+            }
+
+            switch (ch) {
+            case CR:
+                state = sw_chunk_extension_almost_done;
+                break;
+            case LF:
+                state = sw_chunk_data;
+                break;
+            case ';':
+            case ' ':
+            case '\t':
+                state = sw_chunk_extension;
+                break;
+            default:
+                goto invalid;
+            }
+
+            break;
+
+        case sw_chunk_extension:
+            switch (ch) {
+            case CR:
+                state = sw_chunk_extension_almost_done;
+                break;
+            case LF:
+                state = sw_chunk_data;
+            }
+            break;
+
+        case sw_chunk_extension_almost_done:
+            if (ch == LF) {
+                state = sw_chunk_data;
+                break;
+            }
+            goto invalid;
+
+        case sw_chunk_data:
+            rc = NGX_OK;
+            goto data;
+
+        case sw_after_data:
+            switch (ch) {
+            case CR:
+                state = sw_after_data_almost_done;
+                break;
+            case LF:
+                state = sw_chunk_start;
+            }
+            break;
+
+        case sw_after_data_almost_done:
+            if (ch == LF) {
+                state = sw_chunk_start;
+                break;
+            }
+            goto invalid;
+
+        case sw_last_chunk_extension:
+            switch (ch) {
+            case CR:
+                state = sw_last_chunk_extension_almost_done;
+                break;
+            case LF:
+                state = sw_trailer;
+            }
+            break;
+
+        case sw_last_chunk_extension_almost_done:
+            if (ch == LF) {
+                state = sw_trailer;
+                break;
+            }
+            goto invalid;
+
+        case sw_trailer:
+            switch (ch) {
+            case CR:
+                state = sw_trailer_almost_done;
+                break;
+            case LF:
+                goto done;
+            default:
+                state = sw_trailer_header;
+            }
+            break;
+
+        case sw_trailer_almost_done:
+            if (ch == LF) {
+                goto done;
+            }
+            goto invalid;
+
+        case sw_trailer_header:
+            switch (ch) {
+            case CR:
+                state = sw_trailer_header_almost_done;
+                break;
+            case LF:
+                state = sw_trailer;
+            }
+            break;
+
+        case sw_trailer_header_almost_done:
+            if (ch == LF) {
+                state = sw_trailer;
+                break;
+            }
+            goto invalid;
+
+        }
+    }
+
+data:
+
+    ctx->state = state;
+    b->pos = pos;
+
+    switch (state) {
+
+    case sw_chunk_start:
+        ctx->length = 3 /* "0" LF LF */;
+        break;
+    case sw_chunk_size:
+        ctx->length = 2 /* LF LF */
+                      + (ctx->size ? ctx->size + 4 /* LF "0" LF LF */ : 0);
+        break;
+    case sw_chunk_extension:
+    case sw_chunk_extension_almost_done:
+        ctx->length = 1 /* LF */ + ctx->size + 4 /* LF "0" LF LF */;
+        break;
+    case sw_chunk_data:
+        ctx->length = ctx->size + 4 /* LF "0" LF LF */;
+        break;
+    case sw_after_data:
+    case sw_after_data_almost_done:
+        ctx->length = 4 /* LF "0" LF LF */;
+        break;
+    case sw_last_chunk_extension:
+    case sw_last_chunk_extension_almost_done:
+        ctx->length = 2 /* LF LF */;
+        break;
+    case sw_trailer:
+    case sw_trailer_almost_done:
+        ctx->length = 1 /* LF */;
+        break;
+    case sw_trailer_header:
+    case sw_trailer_header_almost_done:
+        ctx->length = 2 /* LF LF */;
+        break;
+
+    }
+
+    return rc;
+
+done:
+
+    ctx->state = 0;
+    b->pos = pos + 1;
+
+    return NGX_DONE;
+
+invalid:
+
+    return NGX_ERROR;
+}
diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index ef010ff57..e94e7fcce 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -1574,19 +1574,11 @@ ngx_http_process_request_header(ngx_http_request_t *r)
         if (r->headers_in.content_length_n == NGX_ERROR) {
             ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
                           "client sent invalid \"Content-Length\" header");
-            ngx_http_finalize_request(r, NGX_HTTP_LENGTH_REQUIRED);
+            ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
             return NGX_ERROR;
         }
     }
 
-    if (r->method & NGX_HTTP_PUT && r->headers_in.content_length_n == -1) {
-        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
-                  "client sent %V method without \"Content-Length\" header",
-                  &r->method_name);
-        ngx_http_finalize_request(r, NGX_HTTP_LENGTH_REQUIRED);
-        return NGX_ERROR;
-    }
-
     if (r->method & NGX_HTTP_TRACE) {
         ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
                       "client sent TRACE method");
@@ -1594,14 +1586,25 @@ ngx_http_process_request_header(ngx_http_request_t *r)
         return NGX_ERROR;
     }
 
-    if (r->headers_in.transfer_encoding
-        && ngx_strcasestrn(r->headers_in.transfer_encoding->value.data,
-                           "chunked", 7 - 1))
-    {
-        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
-                      "client sent \"Transfer-Encoding: chunked\" header");
-        ngx_http_finalize_request(r, NGX_HTTP_LENGTH_REQUIRED);
-        return NGX_ERROR;
+    if (r->headers_in.transfer_encoding) {
+        if (r->headers_in.transfer_encoding->value.len == 7
+            && ngx_strncasecmp(r->headers_in.transfer_encoding->value.data,
+                               (u_char *) "chunked", 7) == 0)
+        {
+            r->headers_in.content_length = NULL;
+            r->headers_in.content_length_n = -1;
+            r->headers_in.chunked = 1;
+
+        } else if (r->headers_in.transfer_encoding->value.len != 8
+            || ngx_strncasecmp(r->headers_in.transfer_encoding->value.data,
+                               (u_char *) "identity", 8) != 0)
+        {
+            ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
+                          "client sent unknown \"Transfer-Encoding\": \"%V\"",
+                          &r->headers_in.transfer_encoding->value);
+            ngx_http_finalize_request(r, NGX_HTTP_NOT_IMPLEMENTED);
+            return NGX_ERROR;
+        }
     }
 
     if (r->headers_in.connection_type == NGX_HTTP_CONNECTION_KEEP_ALIVE) {
diff --git a/src/http/ngx_http_request.h b/src/http/ngx_http_request.h
index b6ff8983a..f234840c1 100644
--- a/src/http/ngx_http_request.h
+++ b/src/http/ngx_http_request.h
@@ -224,6 +224,7 @@ typedef struct {
     time_t                            keep_alive_n;
 
     unsigned                          connection_type:2;
+    unsigned                          chunked:1;
     unsigned                          msie:1;
     unsigned                          msie6:1;
     unsigned                          opera:1;
@@ -276,7 +277,9 @@ typedef struct {
     ngx_chain_t                      *bufs;
     ngx_buf_t                        *buf;
     off_t                             rest;
-    ngx_chain_t                      *to_write;
+    ngx_chain_t                      *free;
+    ngx_chain_t                      *busy;
+    ngx_http_chunked_t               *chunked;
     ngx_http_client_body_handler_pt   post_handler;
 } ngx_http_request_body_t;
 
diff --git a/src/http/ngx_http_request_body.c b/src/http/ngx_http_request_body.c
index bddd7c580..749e4aedb 100644
--- a/src/http/ngx_http_request_body.c
+++ b/src/http/ngx_http_request_body.c
@@ -12,18 +12,21 @@
 
 static void ngx_http_read_client_request_body_handler(ngx_http_request_t *r);
 static ngx_int_t ngx_http_do_read_client_request_body(ngx_http_request_t *r);
-static ngx_int_t ngx_http_write_request_body(ngx_http_request_t *r,
-    ngx_chain_t *body);
+static ngx_int_t ngx_http_write_request_body(ngx_http_request_t *r);
 static ngx_int_t ngx_http_read_discarded_request_body(ngx_http_request_t *r);
+static ngx_int_t ngx_http_discard_request_body_filter(ngx_http_request_t *r,
+    ngx_buf_t *b);
 static ngx_int_t ngx_http_test_expect(ngx_http_request_t *r);
 
+static ngx_int_t ngx_http_request_body_filter(ngx_http_request_t *r,
+    ngx_chain_t *in);
+static ngx_int_t ngx_http_request_body_length_filter(ngx_http_request_t *r,
+    ngx_chain_t *in);
+static ngx_int_t ngx_http_request_body_chunked_filter(ngx_http_request_t *r,
+    ngx_chain_t *in);
+static ngx_int_t ngx_http_request_body_save_filter(ngx_http_request_t *r,
+    ngx_chain_t *in);
 
-/*
- * on completion ngx_http_read_client_request_body() adds to
- * r->request_body->bufs one or two bufs:
- *    *) one memory buf that was preread in r->header_in;
- *    *) one memory or file buf that contains the rest of the body
- */
 
 ngx_int_t
 ngx_http_read_client_request_body(ngx_http_request_t *r,
@@ -31,9 +34,8 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
 {
     size_t                     preread;
     ssize_t                    size;
-    ngx_buf_t                 *b;
-    ngx_chain_t               *cl, **next;
-    ngx_temp_file_t           *tf;
+    ngx_int_t                  rc;
+    ngx_chain_t                out;
     ngx_http_request_body_t   *rb;
     ngx_http_core_loc_conf_t  *clcf;
 
@@ -45,69 +47,36 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
     }
 
     if (ngx_http_test_expect(r) != NGX_OK) {
-        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
+        goto done;
     }
 
     rb = ngx_pcalloc(r->pool, sizeof(ngx_http_request_body_t));
     if (rb == NULL) {
-        return NGX_HTTP_INTERNAL_SERVER_ERROR;
-    }
-
-    r->request_body = rb;
-
-    if (r->headers_in.content_length_n < 0) {
-        post_handler(r);
-        return NGX_OK;
-    }
-
-    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
-
-    if (r->headers_in.content_length_n == 0) {
-
-        if (r->request_body_in_file_only) {
-            tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t));
-            if (tf == NULL) {
-                return NGX_HTTP_INTERNAL_SERVER_ERROR;
-            }
-
-            tf->file.fd = NGX_INVALID_FILE;
-            tf->file.log = r->connection->log;
-            tf->path = clcf->client_body_temp_path;
-            tf->pool = r->pool;
-            tf->warn = "a client request body is buffered to a temporary file";
-            tf->log_level = r->request_body_file_log_level;
-            tf->persistent = r->request_body_in_persistent_file;
-            tf->clean = r->request_body_in_clean_file;
-
-            if (r->request_body_file_group_access) {
-                tf->access = 0660;
-            }
-
-            rb->temp_file = tf;
-
-            if (ngx_create_temp_file(&tf->file, tf->path, tf->pool,
-                                     tf->persistent, tf->clean, tf->access)
-                != NGX_OK)
-            {
-                return NGX_HTTP_INTERNAL_SERVER_ERROR;
-            }
-        }
-
-        post_handler(r);
-
-        return NGX_OK;
+        rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
+        goto done;
     }
 
-    rb->post_handler = post_handler;
-
     /*
      * set by ngx_pcalloc():
      *
      *     rb->bufs = NULL;
      *     rb->buf = NULL;
-     *     rb->rest = 0;
+     *     rb->free = NULL;
+     *     rb->busy = NULL;
+     *     rb->chunked = NULL;
      */
 
+    rb->rest = -1;
+    rb->post_handler = post_handler;
+
+    r->request_body = rb;
+
+    if (r->headers_in.content_length_n < 0 && !r->headers_in.chunked) {
+        post_handler(r);
+        return NGX_OK;
+    }
+
     preread = r->header_in->last - r->header_in->pos;
 
     if (preread) {
@@ -117,79 +86,70 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
         ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                        "http client request body preread %uz", preread);
 
-        b = ngx_calloc_buf(r->pool);
-        if (b == NULL) {
-            return NGX_HTTP_INTERNAL_SERVER_ERROR;
-        }
+        out.buf = r->header_in;
+        out.next = NULL;
 
-        b->temporary = 1;
-        b->start = r->header_in->pos;
-        b->pos = r->header_in->pos;
-        b->last = r->header_in->last;
-        b->end = r->header_in->end;
+        rc = ngx_http_request_body_filter(r, &out);
 
-        rb->bufs = ngx_alloc_chain_link(r->pool);
-        if (rb->bufs == NULL) {
-            return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        if (rc != NGX_OK) {
+            goto done;
         }
 
-        rb->bufs->buf = b;
-        rb->bufs->next = NULL;
-
-        rb->buf = b;
+        r->request_length += preread - (r->header_in->last - r->header_in->pos);
 
-        if ((off_t) preread >= r->headers_in.content_length_n) {
-
-            /* the whole request body was pre-read */
-
-            r->header_in->pos += (size_t) r->headers_in.content_length_n;
-            r->request_length += r->headers_in.content_length_n;
-            b->last = r->header_in->pos;
-
-            if (r->request_body_in_file_only) {
-                if (ngx_http_write_request_body(r, rb->bufs) != NGX_OK) {
-                    return NGX_HTTP_INTERNAL_SERVER_ERROR;
-                }
-            }
+        if (!r->headers_in.chunked
+            && rb->rest > 0
+            && rb->rest <= (off_t) (r->header_in->end - r->header_in->last))
+        {
+            /* the whole request body may be placed in r->header_in */
 
-            post_handler(r);
+            rb->buf = r->header_in;
+            r->read_event_handler = ngx_http_read_client_request_body_handler;
+            r->write_event_handler = ngx_http_request_empty_handler;
 
-            return NGX_OK;
+            rc = ngx_http_do_read_client_request_body(r);
+            goto done;
         }
 
-        /*
-         * to not consider the body as pipelined request in
-         * ngx_http_set_keepalive()
-         */
-        r->header_in->pos = r->header_in->last;
-
-        r->request_length += preread;
-
-        rb->rest = r->headers_in.content_length_n - preread;
-
-        if (rb->rest <= (off_t) (b->end - b->last)) {
+    } else {
+        /* set rb->rest */
 
-            /* the whole request body may be placed in r->header_in */
+        if (ngx_http_request_body_filter(r, NULL) != NGX_OK) {
+            rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
+            goto done;
+        }
+    }
 
-            rb->to_write = rb->bufs;
+    if (rb->rest == 0) {
+        /* the whole request body was pre-read */
 
-            r->read_event_handler = ngx_http_read_client_request_body_handler;
-
-            return ngx_http_do_read_client_request_body(r);
+        if (r->request_body_in_file_only) {
+            if (ngx_http_write_request_body(r) != NGX_OK) {
+                rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
+                goto done;
+            }
         }
 
-        next = &rb->bufs->next;
+        post_handler(r);
 
-    } else {
-        b = NULL;
-        rb->rest = r->headers_in.content_length_n;
-        next = &rb->bufs;
+        return NGX_OK;
+    }
+
+    if (rb->rest < 0) {
+        ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
+                      "negative request body rest");
+        rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
+        goto done;
     }
 
+    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
+
     size = clcf->client_body_buffer_size;
     size += size >> 2;
 
-    if (rb->rest < size) {
+    /* TODO: honor r->request_body_in_single_buf */
+
+    if (!r->headers_in.chunked && rb->rest < size) {
         size = (ssize_t) rb->rest;
 
         if (r->request_body_in_single_buf) {
@@ -198,44 +158,26 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
 
     } else {
         size = clcf->client_body_buffer_size;
-
-        /* disable copying buffer for r->request_body_in_single_buf */
-        b = NULL;
     }
 
     rb->buf = ngx_create_temp_buf(r->pool, size);
     if (rb->buf == NULL) {
-        return NGX_HTTP_INTERNAL_SERVER_ERROR;
-    }
-
-    cl = ngx_alloc_chain_link(r->pool);
-    if (cl == NULL) {
-        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
+        goto done;
     }
 
-    cl->buf = rb->buf;
-    cl->next = NULL;
-
-    if (b && r->request_body_in_single_buf) {
-        size = b->last - b->pos;
-        ngx_memcpy(rb->buf->pos, b->pos, size);
-        rb->buf->last += size;
-
-        next = &rb->bufs;
-    }
+    r->read_event_handler = ngx_http_read_client_request_body_handler;
+    r->write_event_handler = ngx_http_request_empty_handler;
 
-    *next = cl;
+    rc = ngx_http_do_read_client_request_body(r);
 
-    if (r->request_body_in_file_only || r->request_body_in_single_buf) {
-        rb->to_write = rb->bufs;
+done:
 
-    } else {
-        rb->to_write = rb->bufs->next ? rb->bufs->next : rb->bufs;
+    if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
+        r->main->count--;
     }
 
-    r->read_event_handler = ngx_http_read_client_request_body_handler;
-
-    return ngx_http_do_read_client_request_body(r);
+    return rc;
 }
 
 
@@ -261,9 +203,12 @@ ngx_http_read_client_request_body_handler(ngx_http_request_t *r)
 static ngx_int_t
 ngx_http_do_read_client_request_body(ngx_http_request_t *r)
 {
+    off_t                      rest;
     size_t                     size;
     ssize_t                    n;
+    ngx_int_t                  rc;
     ngx_buf_t                 *b;
+    ngx_chain_t               *cl, out;
     ngx_connection_t          *c;
     ngx_http_request_body_t   *rb;
     ngx_http_core_loc_conf_t  *clcf;
@@ -278,18 +223,44 @@ ngx_http_do_read_client_request_body(ngx_http_request_t *r)
         for ( ;; ) {
             if (rb->buf->last == rb->buf->end) {
 
-                if (ngx_http_write_request_body(r, rb->to_write) != NGX_OK) {
+                /* pass buffer to request body filter chain */
+
+                out.buf = rb->buf;
+                out.next = NULL;
+
+                rc = ngx_http_request_body_filter(r, &out);
+
+                if (rc != NGX_OK) {
+                    return rc;
+                }
+
+                /* write to file */
+
+                if (ngx_http_write_request_body(r) != NGX_OK) {
                     return NGX_HTTP_INTERNAL_SERVER_ERROR;
                 }
 
-                rb->to_write = rb->bufs->next ? rb->bufs->next : rb->bufs;
+                /* update chains */
+
+                rc = ngx_http_request_body_filter(r, NULL);
+
+                if (rc != NGX_OK) {
+                    return rc;
+                }
+
+                if (rb->busy != NULL) {
+                    return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                }
+
+                rb->buf->pos = rb->buf->start;
                 rb->buf->last = rb->buf->start;
             }
 
             size = rb->buf->end - rb->buf->last;
+            rest = rb->rest - (rb->buf->last - rb->buf->pos);
 
-            if ((off_t) size > rb->rest) {
-                size = (size_t) rb->rest;
+            if ((off_t) size > rest) {
+                size = (size_t) rest;
             }
 
             n = c->recv(c, rb->buf->last, size);
@@ -312,9 +283,21 @@ ngx_http_do_read_client_request_body(ngx_http_request_t *r)
             }
 
             rb->buf->last += n;
-            rb->rest -= n;
             r->request_length += n;
 
+            if (n == rest) {
+                /* pass buffer to request body filter chain */
+
+                out.buf = rb->buf;
+                out.next = NULL;
+
+                rc = ngx_http_request_body_filter(r, &out);
+
+                if (rc != NGX_OK) {
+                    return rc;
+                }
+            }
+
             if (rb->rest == 0) {
                 break;
             }
@@ -351,32 +334,24 @@ ngx_http_do_read_client_request_body(ngx_http_request_t *r)
 
         /* save the last part */
 
-        if (ngx_http_write_request_body(r, rb->to_write) != NGX_OK) {
+        if (ngx_http_write_request_body(r) != NGX_OK) {
             return NGX_HTTP_INTERNAL_SERVER_ERROR;
         }
 
-        b = ngx_calloc_buf(r->pool);
-        if (b == NULL) {
+        cl = ngx_chain_get_free_buf(r->pool, &rb->free);
+        if (cl == NULL) {
             return NGX_HTTP_INTERNAL_SERVER_ERROR;
         }
 
+        b = cl->buf;
+
+        ngx_memzero(b, sizeof(ngx_buf_t));
+
         b->in_file = 1;
-        b->file_pos = 0;
         b->file_last = rb->temp_file->file.offset;
         b->file = &rb->temp_file->file;
 
-        if (rb->bufs->next) {
-            rb->bufs->next->buf = b;
-
-        } else {
-            rb->bufs->buf = b;
-        }
-    }
-
-    if (rb->bufs->next
-        && (r->request_body_in_file_only || r->request_body_in_single_buf))
-    {
-        rb->bufs = rb->bufs->next;
+        rb->bufs = cl;
     }
 
     r->read_event_handler = ngx_http_block_reading;
@@ -388,15 +363,19 @@ ngx_http_do_read_client_request_body(ngx_http_request_t *r)
 
 
 static ngx_int_t
-ngx_http_write_request_body(ngx_http_request_t *r, ngx_chain_t *body)
+ngx_http_write_request_body(ngx_http_request_t *r)
 {
     ssize_t                    n;
+    ngx_chain_t               *cl;
     ngx_temp_file_t           *tf;
     ngx_http_request_body_t   *rb;
     ngx_http_core_loc_conf_t  *clcf;
 
     rb = r->request_body;
 
+    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "http write client request body, bufs %p", rb->bufs);
+
     if (rb->temp_file == NULL) {
         tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t));
         if (tf == NULL) {
@@ -419,9 +398,26 @@ ngx_http_write_request_body(ngx_http_request_t *r, ngx_chain_t *body)
         }
 
         rb->temp_file = tf;
+
+        if (rb->bufs == NULL) {
+            /* empty body with r->request_body_in_file_only */
+
+            if (ngx_create_temp_file(&tf->file, tf->path, tf->pool,
+                                     tf->persistent, tf->clean, tf->access)
+                != NGX_OK)
+            {
+                return NGX_ERROR;
+            }
+
+            return NGX_OK;
+        }
     }
 
-    n = ngx_write_chain_to_temp_file(rb->temp_file, body);
+    if (rb->bufs == NULL) {
+        return NGX_OK;
+    }
+
+    n = ngx_write_chain_to_temp_file(rb->temp_file, rb->bufs);
 
     /* TODO: n == 0 or not complete and level event */
 
@@ -431,6 +427,14 @@ ngx_http_write_request_body(ngx_http_request_t *r, ngx_chain_t *body)
 
     rb->temp_file->offset += n;
 
+    /* mark all buffers as written */
+
+    for (cl = rb->bufs; cl; cl = cl->next) {
+        cl->buf->pos = cl->buf->last;
+    }
+
+    rb->bufs = NULL;
+
     return NGX_OK;
 }
 
@@ -439,9 +443,10 @@ ngx_int_t
 ngx_http_discard_request_body(ngx_http_request_t *r)
 {
     ssize_t       size;
+    ngx_int_t     rc;
     ngx_event_t  *rev;
 
-    if (r != r->main || r->discard_body) {
+    if (r != r->main || r->discard_body || r->request_body) {
         return NGX_OK;
     }
 
@@ -457,37 +462,45 @@ ngx_http_discard_request_body(ngx_http_request_t *r)
         ngx_del_timer(rev);
     }
 
-    if (r->headers_in.content_length_n <= 0 || r->request_body) {
+    if (r->headers_in.content_length_n <= 0 && !r->headers_in.chunked) {
         return NGX_OK;
     }
 
     size = r->header_in->last - r->header_in->pos;
 
-    if (size) {
-        if (r->headers_in.content_length_n > size) {
-            r->header_in->pos += size;
-            r->headers_in.content_length_n -= size;
+    if (size || r->headers_in.chunked) {
+        rc = ngx_http_discard_request_body_filter(r, r->header_in);
 
-        } else {
-            r->header_in->pos += (size_t) r->headers_in.content_length_n;
-            r->headers_in.content_length_n = 0;
+        if (rc != NGX_OK) {
+            return rc;
+        }
+
+        if (r->headers_in.content_length_n == 0) {
             return NGX_OK;
         }
     }
 
+    rc = ngx_http_read_discarded_request_body(r);
+
+    if (rc == NGX_OK) {
+        r->lingering_close = 0;
+        return NGX_OK;
+    }
+
+    if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
+        return rc;
+    }
+
+    /* rc == NGX_AGAIN */
+
     r->read_event_handler = ngx_http_discarded_request_body_handler;
 
     if (ngx_handle_read_event(rev, 0) != NGX_OK) {
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }
 
-    if (ngx_http_read_discarded_request_body(r) == NGX_OK) {
-        r->lingering_close = 0;
-
-    } else {
-        r->count++;
-        r->discard_body = 1;
-    }
+    r->count++;
+    r->discard_body = 1;
 
     return NGX_OK;
 }
@@ -535,6 +548,12 @@ ngx_http_discarded_request_body_handler(ngx_http_request_t *r)
         return;
     }
 
+    if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
+        c->error = 1;
+        ngx_http_finalize_request(r, NGX_ERROR);
+        return;
+    }
+
     /* rc == NGX_AGAIN */
 
     if (ngx_handle_read_event(rev, 0) != NGX_OK) {
@@ -561,13 +580,19 @@ ngx_http_discarded_request_body_handler(ngx_http_request_t *r)
 static ngx_int_t
 ngx_http_read_discarded_request_body(ngx_http_request_t *r)
 {
-    size_t   size;
-    ssize_t  n;
-    u_char   buffer[NGX_HTTP_DISCARD_BUFFER_SIZE];
+    size_t     size;
+    ssize_t    n;
+    ngx_int_t  rc;
+    ngx_buf_t  b;
+    u_char     buffer[NGX_HTTP_DISCARD_BUFFER_SIZE];
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http read discarded body");
 
+    ngx_memzero(&b, sizeof(ngx_buf_t));
+
+    b.temporary = 1;
+
     for ( ;; ) {
         if (r->headers_in.content_length_n == 0) {
             r->read_event_handler = ngx_http_block_reading;
@@ -578,9 +603,8 @@ ngx_http_read_discarded_request_body(ngx_http_request_t *r)
             return NGX_AGAIN;
         }
 
-        size = (r->headers_in.content_length_n > NGX_HTTP_DISCARD_BUFFER_SIZE) ?
-                   NGX_HTTP_DISCARD_BUFFER_SIZE:
-                   (size_t) r->headers_in.content_length_n;
+        size = (size_t) ngx_min(r->headers_in.content_length_n,
+                                NGX_HTTP_DISCARD_BUFFER_SIZE);
 
         n = r->connection->recv(r->connection, buffer, size);
 
@@ -597,8 +621,104 @@ ngx_http_read_discarded_request_body(ngx_http_request_t *r)
             return NGX_OK;
         }
 
-        r->headers_in.content_length_n -= n;
+        b.pos = buffer;
+        b.last = buffer + n;
+
+        rc = ngx_http_discard_request_body_filter(r, &b);
+
+        if (rc != NGX_OK) {
+            return rc;
+        }
+    }
+}
+
+
+static ngx_int_t
+ngx_http_discard_request_body_filter(ngx_http_request_t *r, ngx_buf_t *b)
+{
+    size_t                    size;
+    ngx_int_t                 rc;
+    ngx_http_request_body_t  *rb;
+
+    if (r->headers_in.chunked) {
+
+        rb = r->request_body;
+
+        if (rb == NULL) {
+
+            rb = ngx_pcalloc(r->pool, sizeof(ngx_http_request_body_t));
+            if (rb == NULL) {
+                return NGX_HTTP_INTERNAL_SERVER_ERROR;
+            }
+
+            rb->chunked = ngx_pcalloc(r->pool, sizeof(ngx_http_chunked_t));
+            if (rb->chunked == NULL) {
+                return NGX_HTTP_INTERNAL_SERVER_ERROR;
+            }
+
+            r->request_body = rb;
+        }
+
+        for ( ;; ) {
+
+            rc = ngx_http_parse_chunked(r, b, rb->chunked);
+
+            if (rc == NGX_OK) {
+
+                /* a chunk has been parsed successfully */
+
+                size = b->last - b->pos;
+
+                if ((off_t) size > rb->chunked->size) {
+                    b->pos += rb->chunked->size;
+                    rb->chunked->size = 0;
+
+                } else {
+                    rb->chunked->size -= size;
+                    b->pos = b->last;
+                }
+
+                continue;
+            }
+
+            if (rc == NGX_DONE) {
+
+                /* a whole response has been parsed successfully */
+
+                r->headers_in.content_length_n = 0;
+                break;
+            }
+
+            if (rc == NGX_AGAIN) {
+
+                /* set amount of data we want to see next time */
+
+                r->headers_in.content_length_n = rb->chunked->length;
+                break;
+            }
+
+            /* invalid */
+
+            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+                          "client sent invalid chunked body");
+
+            return NGX_HTTP_BAD_REQUEST;
+        }
+
+    } else {
+        size = b->last - b->pos;
+
+        if ((off_t) size > r->headers_in.content_length_n) {
+            b->pos += r->headers_in.content_length_n;
+            r->headers_in.content_length_n = 0;
+
+        } else {
+            b->pos = b->last;
+            r->headers_in.content_length_n -= size;
+        }
     }
+
+    return NGX_OK;
 }
 
 
@@ -642,3 +762,278 @@ ngx_http_test_expect(ngx_http_request_t *r)
 
     return NGX_ERROR;
 }
+
+
+static ngx_int_t
+ngx_http_request_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
+{
+    if (r->headers_in.chunked) {
+        return ngx_http_request_body_chunked_filter(r, in);
+
+    } else {
+        return ngx_http_request_body_length_filter(r, in);
+    }
+}
+
+
+static ngx_int_t
+ngx_http_request_body_length_filter(ngx_http_request_t *r, ngx_chain_t *in)
+{
+    size_t                     size;
+    ngx_int_t                  rc;
+    ngx_buf_t                 *b;
+    ngx_chain_t               *cl, *tl, *out, **ll;
+    ngx_http_request_body_t   *rb;
+
+    rb = r->request_body;
+
+    if (rb->rest == -1) {
+        ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                       "http request body content length filter");
+
+        rb->rest = r->headers_in.content_length_n;
+    }
+
+    out = NULL;
+    ll = &out;
+
+    for (cl = in; cl; cl = cl->next) {
+
+        tl = ngx_chain_get_free_buf(r->pool, &rb->free);
+        if (tl == NULL) {
+            return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        }
+
+        b = tl->buf;
+
+        ngx_memzero(b, sizeof(ngx_buf_t));
+
+        b->temporary = 1;
+        b->tag = (ngx_buf_tag_t) &ngx_http_read_client_request_body;
+        b->start = cl->buf->start;
+        b->pos = cl->buf->pos;
+        b->last = cl->buf->last;
+        b->end = cl->buf->end;
+
+        size = cl->buf->last - cl->buf->pos;
+
+        if ((off_t) size < rb->rest) {
+            cl->buf->pos = cl->buf->last;
+            rb->rest -= size;
+
+        } else {
+            cl->buf->pos += rb->rest;
+            rb->rest = 0;
+            b->last = cl->buf->pos;
+            b->last_buf = 1;
+        }
+
+        *ll = tl;
+        ll = &tl->next;
+    }
+
+    rc = ngx_http_request_body_save_filter(r, out);
+
+    ngx_chain_update_chains(r->pool, &rb->free, &rb->busy, &out,
+                            (ngx_buf_tag_t) &ngx_http_read_client_request_body);
+
+    return rc;
+}
+
+
+static ngx_int_t
+ngx_http_request_body_chunked_filter(ngx_http_request_t *r, ngx_chain_t *in)
+{
+    size_t                     size;
+    ngx_int_t                  rc;
+    ngx_buf_t                 *b;
+    ngx_chain_t               *cl, *out, *tl, **ll;
+    ngx_http_request_body_t   *rb;
+    ngx_http_core_loc_conf_t  *clcf;
+
+    rb = r->request_body;
+
+    if (rb->rest == -1) {
+
+        ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                       "http request body chunked filter");
+
+        rb->chunked = ngx_pcalloc(r->pool, sizeof(ngx_http_chunked_t));
+        if (rb->chunked == NULL) {
+            return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        }
+
+        r->headers_in.content_length_n = 0;
+        rb->rest = 3;
+    }
+
+    out = NULL;
+    ll = &out;
+
+    for (cl = in; cl; cl = cl->next) {
+
+        for ( ;; ) {
+
+            ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
+                           "http body chunked buf "
+                           "t:%d f:%d %p, pos %p, size: %z file: %O, size: %z",
+                           cl->buf->temporary, cl->buf->in_file,
+                           cl->buf->start, cl->buf->pos,
+                           cl->buf->last - cl->buf->pos,
+                           cl->buf->file_pos,
+                           cl->buf->file_last - cl->buf->file_pos);
+
+            rc = ngx_http_parse_chunked(r, cl->buf, rb->chunked);
+
+            if (rc == NGX_OK) {
+
+                /* a chunk has been parsed successfully */
+
+                clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
+
+                if (clcf->client_max_body_size
+                    && clcf->client_max_body_size
+                       < r->headers_in.content_length_n + rb->chunked->size)
+                {
+                    ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+                                  "client intended to send too large chunked "
+                                  "body: %O bytes",
+                                  r->headers_in.content_length_n
+                                  + rb->chunked->size);
+
+                    r->lingering_close = 1;
+
+                    return NGX_HTTP_REQUEST_ENTITY_TOO_LARGE;
+                }
+
+                tl = ngx_chain_get_free_buf(r->pool, &rb->free);
+                if (tl == NULL) {
+                    return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                }
+
+                b = tl->buf;
+
+                ngx_memzero(b, sizeof(ngx_buf_t));
+
+                b->temporary = 1;
+                b->tag = (ngx_buf_tag_t) &ngx_http_read_client_request_body;
+                b->start = cl->buf->start;
+                b->pos = cl->buf->pos;
+                b->last = cl->buf->last;
+                b->end = cl->buf->end;
+
+                *ll = tl;
+                ll = &tl->next;
+
+                size = cl->buf->last - cl->buf->pos;
+
+                if ((off_t) size > rb->chunked->size) {
+                    cl->buf->pos += rb->chunked->size;
+                    r->headers_in.content_length_n += rb->chunked->size;
+                    rb->chunked->size = 0;
+
+                } else {
+                    rb->chunked->size -= size;
+                    r->headers_in.content_length_n += size;
+                    cl->buf->pos = cl->buf->last;
+                }
+
+                b->last = cl->buf->pos;
+
+                continue;
+            }
+
+            if (rc == NGX_DONE) {
+
+                /* a whole response has been parsed successfully */
+
+                rb->rest = 0;
+
+                tl = ngx_chain_get_free_buf(r->pool, &rb->free);
+                if (tl == NULL) {
+                    return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                }
+
+                b = tl->buf;
+
+                ngx_memzero(b, sizeof(ngx_buf_t));
+
+                b->last_buf = 1;
+
+                *ll = tl;
+                ll = &tl->next;
+
+                break;
+            }
+
+            if (rc == NGX_AGAIN) {
+
+                /* set rb->rest, amount of data we want to see next time */
+
+                rb->rest = rb->chunked->length;
+
+                break;
+            }
+
+            /* invalid */
+
+            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+                          "client sent invalid chunked body");
+
+            return NGX_HTTP_BAD_REQUEST;
+        }
+    }
+
+    rc = ngx_http_request_body_save_filter(r, out);
+
+    ngx_chain_update_chains(r->pool, &rb->free, &rb->busy, &out,
+                            (ngx_buf_tag_t) &ngx_http_read_client_request_body);
+
+    return rc;
+}
+
+
+static ngx_int_t
+ngx_http_request_body_save_filter(ngx_http_request_t *r, ngx_chain_t *in)
+{
+#if (NGX_DEBUG)
+    ngx_chain_t               *cl;
+#endif
+    ngx_http_request_body_t   *rb;
+
+    rb = r->request_body;
+
+#if (NGX_DEBUG)
+
+    for (cl = rb->bufs; cl; cl = cl->next) {
+        ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
+                       "http body old buf t:%d f:%d %p, pos %p, size: %z "
+                       "file: %O, size: %z",
+                       cl->buf->temporary, cl->buf->in_file,
+                       cl->buf->start, cl->buf->pos,
+                       cl->buf->last - cl->buf->pos,
+                       cl->buf->file_pos,
+                       cl->buf->file_last - cl->buf->file_pos);
+    }
+
+    for (cl = in; cl; cl = cl->next) {
+        ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
+                       "http body new buf t:%d f:%d %p, pos %p, size: %z "
+                       "file: %O, size: %z",
+                       cl->buf->temporary, cl->buf->in_file,
+                       cl->buf->start, cl->buf->pos,
+                       cl->buf->last - cl->buf->pos,
+                       cl->buf->file_pos,
+                       cl->buf->file_last - cl->buf->file_pos);
+    }
+
+#endif
+
+    /* TODO: coalesce neighbouring buffers */
+
+    if (ngx_chain_add_copy(r->pool, &rb->bufs, in) != NGX_OK) {
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    return NGX_OK;
+}
diff --git a/src/http/ngx_http_special_response.c b/src/http/ngx_http_special_response.c
index 224cb811d..875c24d9c 100644
--- a/src/http/ngx_http_special_response.c
+++ b/src/http/ngx_http_special_response.c
@@ -260,9 +260,9 @@ static char ngx_http_error_500_page[] =
 
 static char ngx_http_error_501_page[] =
 "<html>" CRLF
-"<head><title>501 Method Not Implemented</title></head>" CRLF
+"<head><title>501 Not Implemented</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
-"<center><h1>501 Method Not Implemented</h1></center>" CRLF
+"<center><h1>501 Not Implemented</h1></center>" CRLF
 ;
 
 
@@ -384,6 +384,7 @@ ngx_http_special_response_handler(ngx_http_request_t *r, ngx_int_t error)
             case NGX_HTTPS_CERT_ERROR:
             case NGX_HTTPS_NO_CERT:
             case NGX_HTTP_INTERNAL_SERVER_ERROR:
+            case NGX_HTTP_NOT_IMPLEMENTED:
                 r->keepalive = 0;
         }
     }
@@ -420,7 +421,7 @@ ngx_http_special_response_handler(ngx_http_request_t *r, ngx_int_t error)
     r->expect_tested = 1;
 
     if (ngx_http_discard_request_body(r) != NGX_OK) {
-        error = NGX_HTTP_INTERNAL_SERVER_ERROR;
+        r->keepalive = 0;
     }
 
     if (clcf->msie_refresh
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 75ef64e55..703017f54 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -1809,9 +1809,16 @@ ngx_http_upstream_test_connect(ngx_connection_t *c)
 #if (NGX_HAVE_KQUEUE)
 
     if (ngx_event_flags & NGX_USE_KQUEUE_EVENT)  {
-        if (c->write->pending_eof) {
+        if (c->write->pending_eof || c->read->pending_eof) {
+            if (c->write->pending_eof) {
+                err = c->write->kq_errno;
+
+            } else {
+                err = c->read->kq_errno;
+            }
+
             c->log->action = "connecting to upstream";
-            (void) ngx_connection_error(c, c->write->kq_errno,
+            (void) ngx_connection_error(c, err,
                                     "kevent() reported that connect() failed");
             return NGX_ERROR;
         }
diff --git a/src/http/ngx_http_upstream_round_robin.c b/src/http/ngx_http_upstream_round_robin.c
index c4998fca5..4b78cffd8 100644
--- a/src/http/ngx_http_upstream_round_robin.c
+++ b/src/http/ngx_http_upstream_round_robin.c
@@ -430,6 +430,10 @@ ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
     if (rrp->peers->single) {
         peer = &rrp->peers->peer[0];
 
+        if (peer->down) {
+            goto failed;
+        }
+
     } else {
 
         /* there are several peers */
diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
index b0949c7f1..db41964f5 100644
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -39,6 +39,8 @@ static ngx_int_t ngx_http_variable_tcpinfo(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
 #endif
 
+static ngx_int_t ngx_http_variable_content_length(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_host(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_binary_remote_addr(ngx_http_request_t *r,
@@ -79,6 +81,8 @@ static ngx_int_t ngx_http_variable_request_body(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_request_body_file(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_http_variable_request_time(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_status(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
 
@@ -108,6 +112,8 @@ static ngx_int_t ngx_http_variable_hostname(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_pid(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_http_variable_msec(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
 
 /*
  * TODO:
@@ -149,8 +155,8 @@ static ngx_http_variable_t  ngx_http_core_variables[] = {
     { ngx_string("http_cookie"), NULL, ngx_http_variable_headers,
       offsetof(ngx_http_request_t, headers_in.cookies), 0, 0 },
 
-    { ngx_string("content_length"), NULL, ngx_http_variable_header,
-      offsetof(ngx_http_request_t, headers_in.content_length), 0, 0 },
+    { ngx_string("content_length"), NULL, ngx_http_variable_content_length,
+      0, 0, 0 },
 
     { ngx_string("content_type"), NULL, ngx_http_variable_header,
       offsetof(ngx_http_request_t, headers_in.content_type), 0, 0 },
@@ -237,6 +243,9 @@ static ngx_http_variable_t  ngx_http_core_variables[] = {
       ngx_http_variable_request_body_file,
       0, 0, 0 },
 
+    { ngx_string("request_time"), NULL, ngx_http_variable_request_time,
+      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
+
     { ngx_string("status"), NULL,
       ngx_http_variable_status, 0,
       NGX_HTTP_VAR_NOCACHEABLE, 0 },
@@ -285,6 +294,9 @@ static ngx_http_variable_t  ngx_http_core_variables[] = {
     { ngx_string("pid"), NULL, ngx_http_variable_pid,
       0, 0, 0 },
 
+    { ngx_string("msec"), NULL, ngx_http_variable_msec,
+      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
+
 #if (NGX_HAVE_TCP_INFO)
     { ngx_string("tcpinfo_rtt"), NULL, ngx_http_variable_tcpinfo,
       0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
@@ -980,6 +992,39 @@ ngx_http_variable_tcpinfo(ngx_http_request_t *r, ngx_http_variable_value_t *v,
 
 
 static ngx_int_t
+ngx_http_variable_content_length(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    u_char  *p;
+
+    if (r->headers_in.content_length) {
+        v->len = r->headers_in.content_length->value.len;
+        v->data = r->headers_in.content_length->value.data;
+        v->valid = 1;
+        v->no_cacheable = 0;
+        v->not_found = 0;
+
+    } else if (r->headers_in.content_length_n >= 0) {
+        p = ngx_pnalloc(r->pool, NGX_OFF_T_LEN);
+        if (p == NULL) {
+            return NGX_ERROR;
+        }
+
+        v->len = ngx_sprintf(p, "%O", r->headers_in.content_length_n) - p;
+        v->data = p;
+        v->valid = 1;
+        v->no_cacheable = 0;
+        v->not_found = 0;
+
+    } else {
+        v->not_found = 1;
+    }
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
 ngx_http_variable_host(ngx_http_request_t *r, ngx_http_variable_value_t *v,
     uintptr_t data)
 {
@@ -1757,7 +1802,7 @@ ngx_http_variable_request_body(ngx_http_request_t *r,
 {
     u_char       *p;
     size_t        len;
-    ngx_buf_t    *buf, *next;
+    ngx_buf_t    *buf;
     ngx_chain_t  *cl;
 
     if (r->request_body == NULL
@@ -1782,8 +1827,13 @@ ngx_http_variable_request_body(ngx_http_request_t *r,
         return NGX_OK;
     }
 
-    next = cl->next->buf;
-    len = (buf->last - buf->pos) + (next->last - next->pos);
+    len = buf->last - buf->pos;
+    cl = cl->next;
+
+    for ( /* void */ ; cl; cl = cl->next) {
+        buf = cl->buf;
+        len += buf->last - buf->pos;
+    }
 
     p = ngx_pnalloc(r->pool, len);
     if (p == NULL) {
@@ -1791,9 +1841,12 @@ ngx_http_variable_request_body(ngx_http_request_t *r,
     }
 
     v->data = p;
+    cl = r->request_body->bufs;
 
-    p = ngx_cpymem(p, buf->pos, buf->last - buf->pos);
-    ngx_memcpy(p, next->pos, next->last - next->pos);
+    for ( /* void */ ; cl; cl = cl->next) {
+        buf = cl->buf;
+        p = ngx_cpymem(p, buf->pos, buf->last - buf->pos);
+    }
 
     v->len = len;
     v->valid = 1;
@@ -1825,6 +1878,35 @@ ngx_http_variable_request_body_file(ngx_http_request_t *r,
 
 
 static ngx_int_t
+ngx_http_variable_request_time(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    u_char          *p;
+    ngx_time_t      *tp;
+    ngx_msec_int_t   ms;
+
+    p = ngx_pnalloc(r->pool, NGX_TIME_T_LEN + 4);
+    if (p == NULL) {
+        return NGX_ERROR;
+    }
+
+    tp = ngx_timeofday();
+
+    ms = (ngx_msec_int_t)
+             ((tp->sec - r->start_sec) * 1000 + (tp->msec - r->start_msec));
+    ms = ngx_max(ms, 0);
+
+    v->len = ngx_sprintf(p, "%T.%03M", ms / 1000, ms % 1000) - p;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
+    v->data = p;
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
 ngx_http_variable_connection(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data)
 {
@@ -1915,6 +1997,30 @@ ngx_http_variable_pid(ngx_http_request_t *r,
 }
 
 
+static ngx_int_t
+ngx_http_variable_msec(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    u_char      *p;
+    ngx_time_t  *tp;
+
+    p = ngx_pnalloc(r->pool, NGX_TIME_T_LEN + 4);
+    if (p == NULL) {
+        return NGX_ERROR;
+    }
+
+    tp = ngx_timeofday();
+
+    v->len = ngx_sprintf(p, "%T.%03M", tp->sec, tp->msec) - p;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
+    v->data = p;
+
+    return NGX_OK;
+}
+
+
 void *
 ngx_http_map_find(ngx_http_request_t *r, ngx_http_map_t *map, ngx_str_t *match)
 {
diff --git a/src/os/unix/ngx_files.c b/src/os/unix/ngx_files.c
index d71aec316..4fdf884fc 100644
--- a/src/os/unix/ngx_files.c
+++ b/src/os/unix/ngx_files.c
@@ -241,8 +241,12 @@ ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl, off_t offset,
             return NGX_ERROR;
         }
 
+        ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0,
+                       "writev: %d, %z", file->fd, n);
+
         file->sys_offset += n;
         file->offset += n;
+        offset += n;
         total += n;
 
     } while (cl);
diff --git a/src/os/unix/ngx_process_cycle.c b/src/os/unix/ngx_process_cycle.c
index 73fb44c8d..c9b0266ed 100644
--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -20,7 +20,7 @@ static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo);
 static ngx_uint_t ngx_reap_children(ngx_cycle_t *cycle);
 static void ngx_master_process_exit(ngx_cycle_t *cycle);
 static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data);
-static void ngx_worker_process_init(ngx_cycle_t *cycle, ngx_uint_t priority);
+static void ngx_worker_process_init(ngx_cycle_t *cycle, ngx_int_t worker);
 static void ngx_worker_process_exit(ngx_cycle_t *cycle);
 static void ngx_channel_handler(ngx_event_t *ev);
 #if (NGX_THREADS)
@@ -62,7 +62,6 @@ ngx_int_t              ngx_threads_n;
 #endif
 
 
-uint64_t       cpu_affinity;
 static u_char  master_process[] = "master process";
 
 
@@ -360,10 +359,8 @@ ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n, ngx_int_t type)
 
     for (i = 0; i < n; i++) {
 
-        cpu_affinity = ngx_get_cpu_affinity(i);
-
-        ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL,
-                          "worker process", type);
+        ngx_spawn_process(cycle, ngx_worker_process_cycle,
+                          (void *) (intptr_t) i, "worker process", type);
 
         ch.pid = ngx_processes[ngx_process_slot].pid;
         ch.slot = ngx_process_slot;
@@ -371,8 +368,6 @@ ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n, ngx_int_t type)
 
         ngx_pass_open_channel(cycle, &ch);
     }
-
-    cpu_affinity = 0;
 }
 
 
@@ -726,12 +721,14 @@ ngx_master_process_exit(ngx_cycle_t *cycle)
 static void
 ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
 {
+    ngx_int_t worker = (intptr_t) data;
+
     ngx_uint_t         i;
     ngx_connection_t  *c;
 
     ngx_process = NGX_PROCESS_WORKER;
 
-    ngx_worker_process_init(cycle, 1);
+    ngx_worker_process_init(cycle, worker);
 
     ngx_setproctitle("worker process");
 
@@ -837,9 +834,10 @@ ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
 
 
 static void
-ngx_worker_process_init(ngx_cycle_t *cycle, ngx_uint_t priority)
+ngx_worker_process_init(ngx_cycle_t *cycle, ngx_int_t worker)
 {
     sigset_t          set;
+    uint64_t          cpu_affinity;
     ngx_int_t         n;
     ngx_uint_t        i;
     struct rlimit     rlmt;
@@ -853,7 +851,7 @@ ngx_worker_process_init(ngx_cycle_t *cycle, ngx_uint_t priority)
 
     ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
 
-    if (priority && ccf->priority != 0) {
+    if (worker >= 0 && ccf->priority != 0) {
         if (setpriority(PRIO_PROCESS, 0, ccf->priority) == -1) {
             ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                           "setpriority(%d) failed", ccf->priority);
@@ -917,8 +915,12 @@ ngx_worker_process_init(ngx_cycle_t *cycle, ngx_uint_t priority)
         }
     }
 
-    if (cpu_affinity) {
-        ngx_setaffinity(cpu_affinity, cycle->log);
+    if (worker >= 0) {
+        cpu_affinity = ngx_get_cpu_affinity(worker);
+
+        if (cpu_affinity) {
+            ngx_setaffinity(cpu_affinity, cycle->log);
+        }
     }
 
 #if (NGX_HAVE_PR_SET_DUMPABLE)
@@ -1294,14 +1296,19 @@ ngx_cache_manager_process_cycle(ngx_cycle_t *cycle, void *data)
     void         *ident[4];
     ngx_event_t   ev;
 
-    cycle->connection_n = 512;
-
+    /*
+     * Set correct process type since closing listening Unix domain socket
+     * in a master process also removes the Unix domain socket file.
+     */
     ngx_process = NGX_PROCESS_HELPER;
 
-    ngx_worker_process_init(cycle, 0);
-
     ngx_close_listening_sockets(cycle);
 
+    /* Set a moderate number of connections for a helper process. */
+    cycle->connection_n = 512;
+
+    ngx_worker_process_init(cycle, -1);
+
     ngx_memzero(&ev, sizeof(ngx_event_t));
     ev.handler = ctx->handler;
     ev.data = ident;