How do I Programmatically Configure a Proxy for a Custom Transport in Go?

Using a Proxy in Custom Transport: Go Programmatic Solution

In Go, by default, the http.Client uses the system's proxy settings as configured in environment variables like HTTP_PROXY and HTTPS_PROXY. However, this behavior may not extend to custom transports.

Using http.ProxyFromEnvironment to Set Proxy

To programmatically configure a proxy for a custom transport, you can use the http.ProxyFromEnvironment method. This method returns a proxy URL based on the environment variables, with HTTPS_PROXY taking precedence for HTTPS requests.

<code class="go">import (
  "log"
  "net/http"
  "os"
)

func main() {
  // Get proxy URL from environment variables
  proxyURL := http.ProxyFromEnvironment(os.Getenv)

  // Create a custom transport
  transport := &http.Transport{
    TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
    Proxy:           proxyURL,
  }

  // Create a client with the custom transport
  client := &http.Client{Transport: transport}

  // Send a request through the proxy
  resp, err := client.Get("https://example.com")
  if err != nil {
    log.Fatal("Error making request:", err)
  }

  // Read the response body
  defer resp.Body.Close()
  body, err := ioutil.ReadAll(resp.Body)
  if err != nil {
    log.Fatal("Error reading response:", err)
  }

  // Print the response body
  fmt.Println(string(body))
}</code>

This code snippet demonstrates the use of http.ProxyFromEnvironment to set the proxy for a custom transport. By using environment variables to configure the proxy settings, you can easily switch between different proxy configurations without modifying the code.

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