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Authentication
HTTP and SOCKS proxies can require authentication, so curl then needs to provide the proper credentials to the proxy to be allowed to use it, and failing to do will only make the proxy return HTTP responses using code 407.
Authentication for proxies is similar to "normal" HTTP authentication. It is separate from the server authentication to allow clients to independently use both normal host authentication as well as proxy authentication.
With curl, you set the user name and password for the proxy authentication with the -U user:password or --proxy-user user:password option:
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curl -U daniel:secr3t -x myproxy:80 http://example.com
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This example will default to using the Basic authentication scheme. Some proxies will require another authentication scheme (and the headers that are returned when you get a 407 response will tell you which) and then you can ask for a specific method with --proxy-digest, --proxy-negotiate, --proxy-ntlm. The above example command again, but asking for NTLM auth with the proxy:
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curl -U daniel:secr3t -x myproxy:80 http://example.com --proxy-ntlm
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There is also the option that asks curl to figure out which method the proxy wants and supports and then go with that (with the possible expense of extra round-trips) using --proxy-anyauth. Asking curl to use any method the proxy wants is then like this:
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curl -U daniel:secr3t -x myproxy:80 http://example.com --proxy-anyauth
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