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Editorial Team
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Asked: 2026-06-17T04:19:01+00:00

I’m trying to send a HTTP request on Windows 8 using an IXMLHTTPRequest2 object

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I’m trying to send a HTTP request on Windows 8 using an IXMLHTTPRequest2 object and I want to customise the outgoing Accept-Encoding header to something other than the default value of “gzip, deflate”. When I try and use SetRequestHeader method to set the Accept-Encoding header, the method call succeeds but the request is still sent with the default header value instead of the value I provided (Verified by using Wireshark to capture the HTTP request).

Sample code (simplified for beverity):

::CoCreateInstance( CLSID_FreeThreadedXMLHTTP60, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS( &m_pXHR ));
m_pXHR->Open( "GET", "http://192.168.0.100/test", m_pXHRCallback.Get(), NULL, NULL, NULL,NULL );
m_pXHR->SetRequestHeader( L"Accept-Encoding", L"gzip" );
m_pXHR->Send( NULL, 0 );

Wireshark capture of request that gets made:

GET /users/me/id HTTP/1.1
Accept: */*
Host: 192.168.0.100
Accept-Encoding: gzip, deflate
Connection: Keep-Alive
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1 Answer

  1. Editorial Team

    According to the docs for SetRequestHeader, it is an append operation only. You’re getting the gzip Accept-Encoding, so I think it’s working as intended. I don’t see a way of removing the default header, however.

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