Go language documentation interpretation: http.Get function implements HTTP requests

Interpretation of Go language documentation: The http.Get function implements HTTP requests and requires specific code examples

Go language is an open source programming language, due to its concise syntax And powerful concurrency capabilities, it is increasingly loved by developers. In the standard library of the Go language, there is an http package that provides rich functions to handle HTTP requests. Among them, the http.Get function is a commonly used method that can be used to send GET requests and obtain the content returned by the corresponding URL.

The http.Get function is defined as follows:

func Get(url string) (resp *Response, err error)

This function accepts a URL string as a parameter and returns a Response type pointer and an error type. Let's explain the usage of this function and its related parameters in detail.

First, we need to import the http package:

import "net/http"

Then, we can use the http.Get function to send a GET request:

resp, err := http.Get("http://www.example.com")

The above code will send "http: //www.example.com" issues a GET request and returns a pointer resp pointing to the response object and a possible error err. We can get the result of the request through resp, and err is used to determine whether the request went wrong.

Next, we can access the results of the request through resp. The response object is defined as follows:

type Response struct {
    Status     string
    StatusCode int
    Header     Header
    Body       io.ReadCloser
    ...
}

Among them, Status represents the HTTP status, StatusCode represents the status code, Header represents the response header information, and Body represents the response body.

We can get the content of the response through the Body field of resp. The Body is an object that implements the io.ReadCloser interface. The content of the response can be read by calling the Read method. It also needs to be read after use. Call the Close method to release related resources.

The following is a complete example that demonstrates how to use the http.Get function to send a GET request and output the content of the response:

package main

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

func main() {
    resp, err := http.Get("http://www.example.com")
    if err != nil {
        fmt.Println("Get request failed:", err)
        return
    }
    defer resp.Body.Close()

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

    fmt.Println(string(body))
}

With the above code, we can send a GET request to "http: //www.example.com" and output the content of the response.

Summary:

Through the http.Get function in the http package of Go language, we can easily send a GET request and obtain the content returned by the corresponding URL. When using this function, we need to pay attention to error handling and resource release. Through the above code example, we can learn how to use the http.Get function to implement HTTP requests. I hope that through the interpretation of this article, readers can better understand and master the usage of this function.

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