How to Authenticate HTTP Requests Through Proxies?

Using Authenticated Proxies in HTTP Requests

When accessing webpages through a proxy IP address that requires authentication, users may encounter the "Proxy Authentication Required" error. To resolve this issue, an additional step is necessary beyond setting up the proxy, as outlined in the authorized proxy tutorial.

Integrating Authentication into the Proxy

The key to resolving this error is modifying the HEADER within the transport:

<code class="go">auth := "username:password"
basicAuth := "Basic " + base64.StdEncoding.EncodeToString([]byte(auth))
transport.ProxyConnectHeader = http.Header{}
transport.ProxyConnectHeader.Add("Proxy-Authorization", basicAuth)</code>

By adding this code, the transport will include the appropriate Proxy-Authorization header with the username and password encoded in base64 format, allowing the proxy to authenticate the request. This should resolve the authentication error and enable successful access to the target webpage.

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