Fixed utf8 decode (ticket #25).

Patch by Alexey Kuts.

Skipping location rewrite phase for server null location.

Additional headers for proxy/fastcgi/uwsgi/scgi_ignore_headers.

Now the following headers may be ignored as well: X-Accel-Limit-Rate,
X-Accel-Buffering, X-Accel-Charset.

Perl related fixes:

*) Handling of Content-Encoding set from perl.

   This fixes double gzipping in case of gzip filter being enabled while perl
   returns already gzipped response.

*) Fixed macro name.

AIO related fixes:

*) Fix for connection drops with AIO.

   Connections serving content with AIO to fast clients were dropped with
   "client timed out" messages after send_timeout from response start.

*) Fix for socket leak with "aio sendfile" and "limit_rate".

   Second aio post happened when timer set by limit_rate expired while we have
   aio request in flight, resulting in "second aio post" alert and socket leak.

   The patch adds actual protection from aio calls with r->aio already set to
   aio sendfile code in ngx_http_copy_filter().  This should fix other cases
   as well, e.g. when sending buffered to disk upstream replies while still
   talking to upstream.

   The ngx_http_writer() is also fixed to handle the above case (though it's
   mostly optimization now).

Autoindex fixes:

*) Autoindex: escape '?' in file names.

   For files with '?' in their names autoindex generated links with '?' not
   escaped.  This resulted in effectively truncated links as '?' indicates
   query string start.

   This is an updated version of the patch originally posted at [1].  It
   introduces generic NGX_ESCAPE_URI_COMPONENT which escapes everything but
   unreserved characters as per RFC 3986.  This approach also renders unneeded
   special colon processing (as colon is percent-encoded now), it's dropped
   accordingly.

   [1] http://nginx.org/pipermail/nginx-devel/2010-February/000112.html

*) Autoindex: escape html in file names.

Added uwsgi_buffering and scgi_buffering directives.

Patch by Peter Smit.

MP4 related fixes:

*) Fixing mp4 module seeking on 32-bit platforms.

*) Adding m4a and m4v MIME types (ticket #42).

Windows related fixes:

*) Fixed segmentation fault with empty config on Windows.
   See here for report:
   http://mailman.nginx.org/pipermail/nginx-ru/2011-September/043288.html

*) Recent SDKs allow to build IPV6 only for Windows XP or above.

*) Fixing conflict with SDK off_t definition.

*) Fix of building by Microsoft Visual C++ 10 compiler.

HTTP cache related fixes:

*) Cache: fix for sending of empty responses.

   Revert wrong fix for empty responses introduced in 0.8.31 and apply new
   one, rewritten to match things done by static module as close as possible.

*) Cache: fix for sending of stale responses.

   For normal cached responses ngx_http_cache_send() sends last buffer and then
   request finalized via ngx_http_finalize_request() call, i.e. everything is
   ok.

   But for stale responses (i.e. when upstream died, but we have something in
   cache) the same ngx_http_cache_send() sends last buffer, but then in
   ngx_http_upstream_finalize_request() another last buffer is send.  This
   causes duplicate final chunk to appear if chunked encoding is used (and
   resulting problems with keepalive connections and so on).

   Fix this by not sending in ngx_http_upstream_finalize_request()
   another last buffer if we know response was from cache.

*) Fixed cache bypass caching of non-cacheable replies (ticket #21).

   If cache was bypassed with proxy_cache_bypass, cache-controlling headers
   (Cache-Control, Expires) wasn't considered and response was cached even
   if it was actually non-cacheable.

   Patch by John Ferlito.