Upstream: fixed error handling of stale and revalidated cache send. The NGX_DONE value returned from ngx_http_upstream_cache_send() indicates that upstream was already finalized in ngx_http_upstream_process_headers(). It was treated as a generic error which resulted in duplicate finalization. Handled NGX_HTTP_UPSTREAM_INVALID_HEADER from ngx_http_upstream_cache_send(). Previously, it could return within ngx_http_upstream_finalize_request(), and since it's below NGX_HTTP_SPECIAL_RESPONSE, a client connection could stuck.

make -f misc/GNUmakefile release

the required tools:
*) xsltproc to build CHANGES,
*) xslscript.pl ( http://hg.nginx.org/xslscript ) to build XSLTs
   from XSLScript sources.


make -f misc/GNUmakefile icons

the required tool:
*) netpbm to create Win32 icons from xpm sources.