HTTP: support multiple Content-Encodings

This is implemented as an output streaming stack of unencoders, the last
calling the client write procedure.

New test 230 checks this feature.

Bug: https://github.com/curl/curl/pull/2002
Reported-By: Daniel Bankhead

1 files changed, 11 insertions, 3 deletions

diff --git a/lib/url.c b/lib/url.c
index 374ac6cfa..aeb0c9027 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -1011,9 +1011,17 @@ CURLcode Curl_setopt(struct Curl_easy *data, CURLoption option,
      *
      */
     argptr = va_arg(param, char *);
-    result = setstropt(&data->set.str[STRING_ENCODING],
-                       (argptr && !*argptr)?
-                       ALL_CONTENT_ENCODINGS: argptr);
+    if(argptr && !*argptr) {
+      argptr = Curl_all_content_encodings();
+      if(!argptr)
+        result = CURLE_OUT_OF_MEMORY;
+      else {
+        result = setstropt(&data->set.str[STRING_ENCODING], argptr);
+        free(argptr);
+      }
+    }
+    else
+      result = setstropt(&data->set.str[STRING_ENCODING], argptr);
     break;
 
   case CURLOPT_TRANSFER_ENCODING: