https://issues.apache.org/bugzilla/show_bug.cgi?id=56541

            Bug ID: 56541
           Summary: Proxy 502's on large file post requests
           Product: Apache httpd-2
           Version: 2.5-HEAD
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_proxy
          Assignee: [email protected]
          Reporter: [email protected]

I'm sending post requests via the Python requests library with file attachments
to our server which is using Apache mod_proxy. Originally, all posts with files
over maybe 300-400kb would return a 502. I found this post:
http://stackoverflow.com/questions/18854041/proxy-error-502-when-uploading-larger-files-with-ie8
and commenting out the suggested line helped, but only by seeming to raise the
file size that makes it through, as now I'm seeing this with 5mb files as well.
I'm making these requests from fairly slow internet (in Zambia), so I wonder if
that is contributing to the timeout?

Apache config at this point:

    SSLEngine On
    SSLCertificateFile /etc/pki/tls/certs/commcarehq.org.crt
    SSLCertificateKeyFile /etc/pki/tls/private/commcarehq.org.key
    SSLCACertificateFile /etc/pki/tls/certs/hq_thawtecabundle.crt
    SSLProxyEngine On
    SetEnv proxy-sendcl 1
    RequestHeader set X-FORWARDED-PROTOCOL ssl
    RequestHeader set X-FORWARDED-SSL on
    RequestHeader set X-FORWADED-PROTO https

The post request is pretty straightforward, in case there is any potential
concern from that side https://gist.github.com/twymer/69959c468f091a5471b9

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