How to Properly Configure Proxy Authentication with the Go HTTP Client?

Proxy Authentication with the Go HTTP Client

When working with a third-party package, it can be challenging to add proxy authentication to existing code. This article addresses how to configure the Go HTTP client to utilize an authenticated proxy.

In the provided code, you attempted to add proxy authentication using the resp.Header.Add("Proxy-Authorization", basicAuth) line after sending a request. However, this approach might not be effective, as the proxy authorization header needs to be set before sending the request.

To resolve this issue, you should modify the code to create a custom HTTP client with the proxy configuration. This modified client can then be used to make requests. You can achieve this by:

// Create a custom HTTP client with proxy authentication
httpClient := &http.Client{
  Transport: &http.Transport{
    Proxy: http.ProxyURL(&url.URL{
      Scheme:   "http",
      User:     url.UserPassword("username", "password"),
      Host:     "proxy.com:8080",
    }),
  },
}

// Make requests using the custom HTTP client
response, err := httpClient.Get(...)

Alternatively, you can use the following code snippet to parse the proxy URL:

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

Once the custom HTTP client is created, you can substitute it in the third-party package to handle requests with proxy authentication.

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