Create a new HTTP request object using the http.NewRequest function

Use the http.NewRequest function to create a new HTTP request object

HTTP request is a way of communication between the application and the server. In the Go language, you can use the http.NewRequest function to create a new HTTP request object to customize the request conveniently and flexibly. This article will introduce how to use the http.NewRequest function and provide corresponding code examples.

In the Go language, the http.NewRequest function is defined as follows:

func NewRequest(method, url string, body io.Reader) (*Request, error)

This function accepts three parameters: method is the request method, which can be "GET", "POST", " PUT", etc.; url is the target URL of the request; body is an object that implements the io.Reader interface and is used to transmit the requested data.

The following is a sample code that demonstrates how to use the http.NewRequest function to create a new HTTP request object:

package main

import (
    "fmt"
    "net/http"
    "strings"
)

func main() {
    url := "https://api.example.com/users"
    method := "POST"
    payload := strings.NewReader(`{"name":"John Doe","email":"johndoe@example.com"}`)

    req, err := http.NewRequest(method, url, payload)
    if err != nil {
        fmt.Println("创建请求失败：", err)
        return
    }

    // 自定义请求头
    req.Header.Add("Content-Type", "application/json")
    req.Header.Add("Authorization", "Bearer abc123")

    // 发送请求
    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        fmt.Println("发送请求失败：", err)
        return
    }

    defer resp.Body.Close()

    fmt.Println("请求响应状态码：", resp.StatusCode)
    // 处理响应数据...
}

In the above example, we use the http.NewRequest function to create a POST request object , set the request target URL to "https://api.example.com/users", and the request body content is {"name":"John Doe","email":"johndoe@example.com"} .

Next, we use the req.Header.Add method to add request header information. In the example, two request headers, Content-Type and Authorization, are added.

Finally, we sent the HTTP request using the Do method of http.Client and obtained the response object resp. We can get the response status code through resp.StatusCode and the response body data through resp.Body.

It should be noted that this is just a simple example. In actual development, other possible errors and response data need to be processed, etc. At the same time, it is recommended to implement error handling in the code to ensure program stability.

Summary:

This article introduces how to use the http.NewRequest function to create a new HTTP request object and provides a sample code. By using the http.NewRequest function, we can easily create customized HTTP requests to achieve more flexible network communication. Hope this article is helpful to you!

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