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Content-Length and Proxy

From: Jeroen Venderbosch <>
Date: Wed, 16 Jan 2013 12:01:32 +0100

I have a question about the Content-Length header field.
        Sending of Post/Get request by using the curl implementation of PHP.
        A https connection is set up with a proxy-server in between.
        Original Post/Get requests become CONNECT requests by curl.
        CONNECT requests arrive at the proxy-server with a Content-Length field set.
        Proxy-server refuses all CONNECT requests because the Content-Length field is set.

I search the W3- standards to see if a Content-Length field is forbidden on a CONNECT request.
I could not really find a clear answer.
Question: Why does (lib)curl set the Content-Length field on a CONNECT request? Is this combination not allowed according to the W3-standards?

Jeroen Venderbosch
Software engineer

WoodWing Software
The Netherlands

Direct +31 75 61 69 946
Office +31 75 61 43 400
Fax +31 75 61 43 399

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Received on 2013-01-16