How to use the net/http/httputil.DumpResponse function in golang to print HTTP response information

How to use the net/http/httputil.DumpResponse function in golang to print HTTP response information

In golang, we can use net/httpPackage to send HTTP requests and receive HTTP responses. Sometimes, we need to view the details of the HTTP response, such as response headers, response body, etc. To achieve this purpose, the net/http/httputil package provides a useful DumpResponse function.

httputil.DumpResponseThe function can output HTTP response information to the specified io.Writer in the form of a byte stream. Next, we will provide a concrete code example showing how to use the httputil.DumpResponse function.

First, we need to import the relevant package:

import (
    "fmt"
    "net/http"
    "net/http/httputil"
    "os"
)

Next, we create an HTTP request and send it:

func main() {
    // 创建HTTP客户端
    client := &http.Client{}

    // 创建HTTP请求
    req, err := http.NewRequest("GET", "https://api.example.com", nil)
    if err != nil {
        fmt.Println("创建HTTP请求失败:", err)
        return
    }

    // 发送HTTP请求并接收响应
    resp, err := client.Do(req)
    if err != nil {
        fmt.Println("发送HTTP请求失败:", err)
        return
    }

    // 打印HTTP响应信息
    dump, err := httputil.DumpResponse(resp, true)
    if err != nil {
        fmt.Println("打印HTTP响应信息失败:", err)
        return
    }

    // 将HTTP响应输出到标准输出
    os.Stdout.Write(dump)
}

In the above code, we first create An instance of http.Client then creates a GET request and sends it to https://api.example.com. Next, we use the httputil.DumpResponse function to print the HTTP response information to the standard output (stdout).

Please note that when calling the httputil.DumpResponse function, we passed true as the second parameter. By doing this, the DumpResponse function will output the response header and response body data together. If the second parameter is set to false, only the response header data will be output.

Run the above code, we will be able to see the detailed output of the HTTP response information, including the contents of the response status line, response headers and response body.

Summary: Using the net/http package in golang we can easily handle HTTP requests and responses. By using the net/http/httputil.DumpResponse function, we can easily print HTTP response information and output it to the specified io.Writer in the form of a byte stream. This is useful for debugging and viewing HTTP response information. I hope this article helps you understand how to use the DumpResponse function.

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