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Editorial Team
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Asked: 2026-06-01T13:42:09+00:00

I am trying to connect through a Bluecoat proxy which uses a cookie during

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I am trying to connect through a Bluecoat proxy which uses a cookie during the proxy authentication.

I have been completely unable to find a combination of CURLOPT_ settings that will get CURL to present the cookie during proxy authentication.

So: the proxy responds with:

HTTP/1.1 407 Proxy Authentication Required
Proxy-Authenticate: NTLM
Cache-Control: no-cache
Pragma: no-cache
Content-Type: text/html; charset=utf-8
Proxy-Connection: close
Set-Cookie: BCSI-CS-EDD688431754D715=2; Path=/
Connection: close
Content-Length: 825

But curl does not present the cookie in subsequent authentication attempts, no matter what I set for CURLOPT_COOKIEFILE or CURLOPT_COOKIEJAR.

NOTE: I am also using (because I must)

CURLOPT_PROXYTYPE = CURLPROXY_HTTP
CURLOPT_PROXYAUTH = CURLAUTH_ANY
CURLOPT_HTTPPROXYTUNNEL = 1
CURLOPT_CONNECT_ONLY = 1

Is it reasonable to expect CURL to present a cookie with a Proxy-Authorization request?

I am using curl_easy_*, would moving to the multi interface help?

Finally, I am building with 7.19.7

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1 Answer

  1. Editorial Team

    The CONNECT request is done a bit separately in the code than the “regular” requests and it seems there’s no cookie handling done there! I consider it a libcurl bug.

    (This is my comment from above, turned into a proper answer.)

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