HTTP HTTP GET HTTP proxy Basic auth HTTP proxy NTLM auth # Server-side HTTP/1.1 407 We only deal with NTLM my friend Server: Microsoft-IIS/5.0 Content-Type: text/html; charset=iso-8859-1 Content-Length: 34 Proxy-Authenticate: NTLM This is not the real page either! # Client-side http HTTP with proxy requiring NTLM, but we send Basic http://%HOSTIP:%HTTPPORT/82 --proxy-user testuser:testpass -x http://%HOSTIP:%HTTPPORT # Verify data after the test has been "shot" ^User-Agent:.* GET http://127.0.0.1:%HTTPPORT/82 HTTP/1.1 Proxy-Authorization: Basic dGVzdHVzZXI6dGVzdHBhc3M= User-Agent: curl/7.10.6-pre1 (i686-pc-linux-gnu) libcurl/7.10.6-pre1 OpenSSL/0.9.7a ipv6 zlib/1.1.3 Host: 127.0.0.1:%HTTPPORT Pragma: no-cache Accept: */* Proxy-Connection: Keep-Alive