Changes with Apache 2.2.32

  *) SECURITY: CVE-2016-8743 (cve.mitre.org)
     Enforce HTTP request grammar corresponding to RFC7230 for request lines
     and request headers, to prevent response splitting and cache pollution by
     malicious clients or downstream proxies.

  *) Validate HTTP response header grammar defined by RFC7230, resulting
     in a 500 error in the event that invalid response header contents are
     detected when serving the response, to avoid response splitting and cache
     pollution by malicious clients, upstream servers or faulty modules.

  *) core: Mitigate [f]cgi CVE-2016-5387 "httpoxy" issues.

  *) core: Avoid a possible truncation of the faulty header included in the
     HTML response when LimitRequestFieldSize is reached.

  *) core: Enforce LimitRequestFieldSize after multiple headers with the same
     name have been merged.

  *) core: Drop Content-Length header and message-body from HTTP 204 responses.

  *) core: Permit unencoded ';' characters to appear in proxy requests and
     Location: response headers. Corresponds to modern browser behavior.

  *) core: ap_rgetline_core now pulls from r->proto_input_filters.

  *) core: Correctly parse an IPv6 literal host specification in an absolute
     URL in the request line.

  *) core: New directive RegisterHttpMethod for registering non-standard
     HTTP methods.

  *) core: Limit to ten the number of tolerated empty lines between request.

  *) core: reject NULLs in request line or request headers.

  *) mod_proxy: Use the correct server name for SNI in case the backend
     SSL connection itself is established via a proxy server.

  *) Fix potential rejection of valid MaxMemFree and ThreadStackSize
     directives.

  *) mod_ssl: Support compilation against libssl built with OPENSSL_NO_SSL3.

  *) mod_proxy: Correctly consider error response codes by the backend when
     processing failonstatus.

  *) mod_proxy: Play/restore the TLS-SNI on new backend connections which
     had to be issued because the remote closed the previous/reusable one
     during idle (keep-alive) time.

  *) mod_ssl: Fix a possible memory leak on restart for custom [EC]DH params.

  *) mod_proxy: Fix a regression with 2.2.31 that caused inherited workers to
     use a different scoreboard slot then the original one.

  *) mod_proxy: Fix a race condition that caused a failed worker to be retried
     before the retry period is over.

  *) mod_proxy: don't recyle backend announced "Connection: close" connections
     to avoid reusing it should the close be effective after some new request
     is ready to be sent.

  *) mod_mem_cache: Fix concurrent removal of stale entries which could lead
     to a crash.

  *) mime.types: add common extension "m4a" for MPEG 4 Audio.

  *) mod_substitute: Allow to configure the patterns merge order with the new
     SubstituteInheritBefore on|off directive.

  *) mod_mem_cache: Don't cache incomplete responses when the client
     connection is aborted before the body is fully read.

  *) abs: Include OPENSSL_Applink when compiling on Windows, to resolve
     failures under Visual Studio 2015 and other mismatched MSVCRT flavors.

  *) core: Support custom ErrorDocuments for HTTP 501 and 414 status codes.


(adam)