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** [bugs:#1354] HTTP proxy gets confused by extra headers like a user-defined "Content-Type"**
**Status:** open
**Created:** Thu Apr 03, 2014 04:20 PM UTC by dvo
**Last Updated:** Thu Apr 03, 2014 04:20 PM UTC
**Owner:** nobody
When using curl via an http proxy like cntlm or polipo and specifying the extra HTTP header "Content-Type", for instance
    curl --proxy http://myproxy:8080" http://server.com/ --data-binary @req.p10 -H "Content-Type: application/pkcs10"
the CONNECT command to the proxy blocks. 
As revealed using "--trace -", the problem is that the extra "Content-Type" header in
    CONNECT server.com HTTP/1.1 
    Host: server.com
    User-Agent: curl/7.36.0
    Proxy-Connection: Keep-Alive
    Content-Type: application/pkcs10
is not only useless, but disturbs the proxy. 
BTW, some proxies seem fine if there is additionally a "Content-Length" header, but this appears useless in the CONNECT message, too. 
Moreover, I'm not sure if the "Proxy-Connection: Keep-Alive" header is useful in this context, and for some reason it is inserted even when the --no-keepalive option is used.
After commenting out the following two code lines in lib/http_proxy.c 
        if(CURLE_OK == result)
          result = Curl_add_custom_headers(conn, req_buffer);
such that no user-defined headers are inserted in the CONNECT message (which, admittedly may be too drastic), the proxy connection gets through fine.
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