How to Configure HTTP Proxy Authentication with Go's `http.Client`?

Go HTTP Proxy with Authentication

When working with a third-party package that uses the http.Client for making HTTP requests, the need arises to configure an HTTP proxy with authentication.

The common approach of setting the Proxy-Authorization header in the request will not work in this scenario. To use a proxy with authentication in this context, a more robust solution is required.

The recommended approach is to create a custom HTTP client that includes the proxy configuration with authentication. This can be done by using the http.Transport structure:

url, _ := url.Parse("http://username:password@proxy.com:8080")
transport := &http.Transport{
    Proxy: http.ProxyURL(url),
}
client := &http.Client{
    Transport: transport,
}

resp, err := client.PostForm(method, params)

This code creates a http.Client with a custom transport that includes the proxy URL and credentials. Now, when you use client to make HTTP requests, it will automatically authenticate with the specified proxy.

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