golang http request header

Golang is a popular programming language used for building high-performance web applications. When developing web applications, HTTP request headers are an essential part, providing information about the request and instructions indicating how the request should be handled.

This article will discuss the relevant content of HTTP request headers in Golang, including what are HTTP request headers, the basic structure of HTTP request headers, how to set HTTP request headers in Golang, and some commonly used HTTP request header fields.

What are HTTP request headers?

HTTP request header refers to a series of key-value pair parameters located after the first line in the HTTP request. It is used to provide some additional information to help the web server process the request and inform the client how to handle it correctly. The server responds. HTTP request headers are sent by the client (browser or other application) to the web server.

The basic structure of the HTTP request header

The HTTP request header consists of several name and value pairs. The name and value are separated by a colon, and each key-value pair is separated by a newline character.

The following is a sample HTTP request header:

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0
Accept-Language: en-US,en;q=0.5
Referer: http://www.example.com/
Connection: keep-alive

How to set HTTP request headers in Golang

Setting HTTP request headers in Golang is very simple. The following is an example of setting HTTP request headers in Golang:

package main

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

func main() {
    req, err := http.NewRequest("GET", "http://www.example.com", nil)
    if err != nil {
        fmt.Println(err)
        return
    }

    // 设置HTTP请求头
    req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36")

    client := &http.Client{}

    resp, err := client.Do(req)
    if err != nil {
        fmt.Println(err)
        return
    }
    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        fmt.Println(err)
        return
    }

    fmt.Println(string(body))
}

In the above example, we use the http.NewRequest() function to create a GET request, and then use the Header.Set() method to set the User-Agent Request header. Finally, we use the Do() method of http.Client to send the HTTP request and read the response body.

Common HTTP request header fields

The following are some commonly used HTTP request header fields:

• Accept: Specify the media types that the client can handle
• Accept-Language: Specifies the language required by the client
• Authorization: Used to contain the client's credentials, used to verify the user's identity
• Cache-Control: Indicates all caching mechanisms Whether this request and the data obtained in the response can be cached
• Connection: Indicates whether the current connection is a persistent connection or a temporary connection
• Content-Type: Specifies the media type of the body
• Cookie : Send a cookie string to the server and request the document associated with it
• Host: Specify the host and port number of the requested resource
• Referer: Indicate the URL of the request source page
• User-Agent: Specify the browser type, operating system type, and version number of the request sent by the client

Summary

This article briefly introduces HTTP requests in Golang Header related content. HTTP request headers provide information about the request and instructions on how to handle the request. The HTTP request header consists of several name and value pairs. Setting the HTTP request header in Golang is very simple, just use the Header.Set() method. Finally, we introduced some common HTTP request header fields. Familiarity with the use of HTTP request headers is important for developing high-performance web applications.

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