How to Authenticate HTTP Requests Through Proxies: Solving the \'Proxy Authentication Required\' Error

HTTP Request with Authentication Through Proxies

HTTP requests commonly require authentication when using proxy servers. However, "Proxy Authentication Required" errors may arise when attempting to access webpages with proxy information.

Previous attempts to solve this issue through Stack Overflow and GitHub have proven unsuccessful. While the post "Setting Up Proxy for HTTP Client" provides a partial solution, the issue persists for certain URLs, prompting the error message "Proxy Authorization Required."

Fortunately, there is a simple solution to this problem. By incorporating the following steps into your code, you can establish successful authentication through proxies for HTTP requests:

1. Define Authorization Credentials:

   • Create a string containing your username and password, separated by a colon ("username:password").
   • Encode this string using base64.StdEncoding.EncodeToString.
   • Save the encoded string as basicAuth.

2. Set Transport Proxy Header:

   • Initialize transport.ProxyConnectHeader as a new HTTP Header object.

   • Add the following line to set the Proxy-Authorization header:

     transport.ProxyConnectHeader.Add("Proxy-Authorization", "Basic " + basicAuth)

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With these modifications, your HTTP requests will successfully authenticate through proxies, allowing access to webpages that previously required authorization.

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