How to Authenticate Go HTTP Proxy Requests with PostForm?

Go http Proxy with Authentication

For scenarios requiring a proxy with authentication, using the PostForm method can be challenging. This article explores a workaround for this issue.

Initial Approach and Its Limitation

Typically, setting the Proxy-Authorization header in the request can suffice for authentication. However, when attempting to modify a third-party package and add proxy support, the Proxy-Authorization header addition after creating the client may not suffice.

Alternative Solution

The alternative approach lies in creating a customized HTTP client with the desired proxy configuration. This client can then be substituted into the third-party package.

Code Snippet:

client := &http.Client{
  Transport: &http.Transport{
    Proxy: http.ProxyURL(&url.URL{
      Scheme: "http",
      User:   url.UserPassword("username", "password"),
      Host:   "146.137.9.45:65233",
    }),
  },
}

This client can be utilized in the third-party package instead of creating a new client each time.

Alternatively, the proxy URL can be parsed directly:

url, _ := url.Parse("http://username:[email protected]:65233")
client := &http.Client{
  Transport: &http.Transport{
    Proxy: http.ProxyURL(url),
  },
}

By using this tailored client, the proxy with authentication can be seamlessly integrated into the third-party package, enabling authenticated proxy requests through the PostForm method.

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