How to make HTTP POST request using Golang?

Using Go to make HTTP POST requests requires: importing HTTP packages; creating HTTP requests; setting request headers; sending requests; and processing responses.

How to make an HTTP POST request using Go

Making an HTTP POST request in Go is a common task that allows clients The client sends data to the server. This article walks you step-by-step through the process of making POST requests using Go.

Step 1: Import the HTTP package

First, you need to import the HTTP package, which provides HTTP functionality in Go.

import "net/http"

Step 2: Create HTTP Request

Next, create a new HTTP request using the http.NewRequest function. This function accepts a request method, request URL, and optional HTTP body.

req, err := http.NewRequest("POST", "https://example.com/api/endpoint", body)
if err != nil {
    // 处理错误
}

Step 3: Set the request header

Set the request header as needed. Here is an example of setting the Content-Type header:

req.Header.Set("Content-Type", "application/json")

Step 4: Send the request

Use http.Client to send the request.

client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
    // 处理错误
}

Step 5: Process the response

Process the response and read the response body from the resp.

defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)

Practical Case

The following is a complete example that demonstrates how to use Go to send a POST request to an API endpoint on localhost:

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    // 创建要发送的数据
    data := map[string]interface{}{
        "name": "John Doe",
        "age":  30,
    }
    jsonBytes, err := json.Marshal(data)
    if err != nil {
        // 处理错误
    }

    // 创建请求
    req, err := http.NewRequest("POST", "http://localhost:8080/api/create", bytes.NewReader(jsonBytes))
    if err != nil {
        // 处理错误
    }

    // 设置内容类型头
    req.Header.Set("Content-Type", "application/json")

    // 发送请求
    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        // 处理错误
    }
    defer resp.Body.Close()

    // 处理响应
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        // 处理错误
    }

    // 打印响应主体
    fmt.Println(string(body))
}

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