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Subject [Bug 58177] New: Mod Proxy does forward trailers in http chunked request to backends
Date Fri, 24 Jul 2015 09:16:50 GMT

            Bug ID: 58177
           Summary: Mod Proxy does forward trailers in http chunked
                    request to backends
           Product: Apache httpd-2
           Version: 2.4.12
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_proxy

As per http spec, we want clients to send us trailers in chunked requests.
However the request on the server side does not get the trailer at all.

This can be reproduced with Apache 2.4.16 and mod proxy

telnet somehost 80
POST /some-path HTTP/1.1
Authorization: Basic XXXX=
Transfer-Encoding: chunked
Trailer: My-Test-Trailer

My-Test-Trailer: some-value-new

Mod proxy is forwarding the request to apache tomcat in our case and it does
not forward the trailers. We have verified that tomcat does get the trailers
when the same request is sent to tomcat directly, so mod proxy is blocking them

Apparently mod proxy never uses the trailers stored in the request/response
trailers as per the discussion in the user group:

This is very critical to us and blocking a feature rollout, I can help testing
a patch if available.

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