How to use http.Transport to customize request headers in Go?

How to use http.Transport to customize request headers in Go?

In the Go language, we often need to use HTTP requests to interact with remote servers. When sending an HTTP request, it is sometimes necessary to customize the request header information to meet some special business needs. Go provides http.Transport to help us achieve this goal. Next, we will introduce how to use http.Transport to customize request headers.

First, we need to import the net/http package, which provides related types and functions for sending HTTP requests. Then, we need to create an http.Transport object that allows us to customize the request headers.

The sample code is as follows:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    // 创建一个http.Transport对象
    transport := &http.Transport{}

    // 设置自定义请求头部
    transport.RequestHeader = make(http.Header)
    transport.RequestHeader.Set("Custom-Header", "Hello, World!")

    // 创建一个http.Client对象，指定自定义的Transport
    client := &http.Client{
        Transport: transport,
    }

    // 创建一个GET请求
    req, err := http.NewRequest("GET", "https://www.example.com", nil)
    if err != nil {
        fmt.Println("Failed to create request:", err)
        return
    }

    // 发送请求
    resp, err := client.Do(req)
    if err != nil {
        fmt.Println("Failed to send request:", err)
        return
    }
    defer resp.Body.Close()

    // 处理响应
    fmt.Println("Response status code:", resp.StatusCode)
}

In the above code, we first create an http.Transport object and use the transport.RequestHeader field to set a custom request head. In this example, we set a custom request header field "Custom-Header" with a value of "Hello, World!".

Next, we create an http.Client object and assign the http.Transport object we just created to it. Then we create a GET request and send it. After getting the response, we can process the response. In this example, we simply print out the response status code.

By using http.Transport and custom request headers, we can easily customize HTTP request headers in Go. In this way, we can meet some special business needs, such as setting customized authentication information or adding special tags.

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