Changes with nginx 1.2.7 12 Feb 2013

    *) Change: now if the "include" directive with mask is used on Unix
       systems, included files are sorted in alphabetical order.

    *) Change: the "add_header" directive adds headers to 201 responses.

    *) Feature: the "geo" directive now supports IPv6 addresses in CIDR
       notation.

    *) Feature: the "flush" and "gzip" parameters of the "access_log"
       directive.

    *) Feature: variables support in the "auth_basic" directive.

    *) Feature: the $pipe, $request_length, $time_iso8601, and $time_local
       variables can now be used not only in the "log_format" directive.
       Thanks to Kiril Kalchev.

    *) Feature: IPv6 support in the ngx_http_geoip_module.
       Thanks to Gregor Kališnik.

    *) Bugfix: nginx could not be built with the ngx_http_perl_module in
       some cases.

    *) Bugfix: a segmentation fault might occur in a worker process if the
       ngx_http_xslt_module was used.

    *) Bugfix: nginx could not be built on MacOSX in some cases.
       Thanks to Piotr Sikora.

    *) Bugfix: the "limit_rate" directive with high rates might result in
       truncated responses on 32-bit platforms.
       Thanks to Alexey Antropov.

    *) Bugfix: a segmentation fault might occur in a worker process if the
       "if" directive was used.
       Thanks to Piotr Sikora.

    *) Bugfix: a "100 Continue" response was issued with "413 Request Entity
       Too Large" responses.

    *) Bugfix: the "image_filter", "image_filter_jpeg_quality" and
       "image_filter_sharpen" directives might be inherited incorrectly.
       Thanks to Ian Babrou.

    *) Bugfix: "crypt_r() failed" errors might appear if the "auth_basic"
       directive was used on Linux.

    *) Bugfix: in backup servers handling.
       Thanks to Thomas Chen.

    *) Bugfix: proxied HEAD requests might return incorrect response if the
       "gzip" directive was used.

    *) Bugfix: a segmentation fault occurred on start or during
       reconfiguration if the "keepalive" directive was specified more than
       once in a single upstream block.

    *) Bugfix: in the "proxy_method" directive.

    *) Bugfix: a segmentation fault might occur in a worker process if
       resolver was used with the poll method.

    *) Bugfix: nginx might hog CPU during SSL handshake with a backend if
       the select, poll, or /dev/poll methods were used.

    *) Bugfix: the "[crit] SSL_write() failed (SSL:)" error.

    *) Bugfix: in the "fastcgi_keep_conn" directive.