How to Use a Proxy with a Custom Transport in Go?

Program Go for Proxy Usage with Custom Transport

In Go, you can configure the standard library's http.Client to automatically use a proxy based on environment variables. However, when using a custom transport, this functionality is not directly supported.

The solution is to utilize the http.ProxyFromEnvironment method. This method returns the proxy URL to use for a given request based on environment variables such as HTTP_PROXY and HTTPS_PROXY.

To use a proxy with a custom transport in Go, follow these steps:

1. Create a custom http.Transport instance:

   <code class="go">tr := &http.Transport{
       TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
   }</code>

2. Set the proxy URL using ProxyFromEnvironment:

   <code class="go">var PTransport = &http.Transport{Proxy: http.ProxyFromEnvironment}</code>

3. Create a http.Client with the custom transport:

   <code class="go">client := http.Client{Transport: PTransport}</code>

4. Use the client to make requests:

   <code class="go">resp, err := client.Get(url)</code>

Here's a code example demonstrating this approach:

<code class="go">package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    var PTransport = &http.Transport{Proxy: http.ProxyFromEnvironment}

    client := http.Client{Transport: PTransport}
    resp, err := client.Get("https://jsonplaceholder.typicode.com/todos/1")
    if err != nil {
        panic(err)
    }

    bodyBytes, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        panic(err)
    }

    fmt.Printf("GET Response = %s \n", string(bodyBytes))
}</code>

Remember to set the HTTP_PROXY and HTTPS_PROXY environment variables appropriately for your proxy server.

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