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Table of Contents
How to initiate a simplest GET request
How to send a POST request with parameters
How to set timeouts, headers, and cookies
Frequently Asked Questions and Precautions
Home Backend Development Golang How to make an HTTP request in Go

How to make an HTTP request in Go

Jul 14, 2025 am 02:48 AM
go http request

The methods for initiating HTTP requests in Go are as follows: 1. Use http.Get() to initiate the simplest GET request, remember to handle the error and close the Body; 2. Use http.Post() or http.NewRequest() to send a POST request, which can set JSON data or form data; 3. Set timeout, header and cookies, control Timeout and Header.Set to add custom headers through Client, and use CookieJar to automatically manage cookies; 4. Notes include having to turn off Body, non-req objects, setting User-Agent, and skipping HTTPS certificate verification if necessary.

How to make an HTTP request in Go

When you want to initiate an HTTP request in Go, it is not complicated. net/http package in the Go standard library has provided a very convenient interface to meet most common needs, such as GET, POST requests, setting headers, handling cookies, etc.

How to make an HTTP request in Go

Let’s take a look at a few key points to help you quickly grasp how to initiate HTTP requests using Go.


How to initiate a simplest GET request

This is the most common use scenario: Getting data from a URL. You can use the http.Get() method, which returns responses and errors.

How to make an HTTP request in Go
 resp, err := http.Get("https://example.com")
if err != nil {
    log.Fatal(err)
}
defer resp.Body.Close()

This code does a few things:

  • Initiate a GET request
  • Check for errors (such as network blockage)
  • Finally, remember to close Body , otherwise the resources will be leaked

After receiving the response, you will usually read the content of resp.Body , which can be read using ioutil.ReadAll() :

How to make an HTTP request in Go
 body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))

How to send a POST request with parameters

POST is more commonly used to submit data than GET. You can use http.Post() or more flexible http.NewRequest() http.Client.Do() .

For example, if you want to send JSON data:

 jsonStr := []byte(`{"name":"test"}`)
req, _ := http.NewRequest("POST", "https://example.com/api", bytes.NewBuffer(jsonStr))
req.Header.Set("Content-Type", "application/json")

client := &http.Client{}
resp, err := client.Do(req)

The key points here are:

  • Create a request object using NewRequest
  • Setting up a Header, such as Content-Type
  • Use Client.Do() to execute the request

If you want to pass form, you can also use http.PostForm() :

 data := url.Values{}
data.Add("key", "value")
resp, _ := http.PostForm("https://example.com/submit", data)

How to set timeouts, headers, and cookies

Sometimes you need to control the behavior of the request, such as setting the timeout time, or adding some custom headers.

 client := &http.Client{
    Timeout: time.Second * 10,
}

This prevents the request from being stuck for too long.

As for the header, you can set it directly on the request object:

 req.Header.Set("Authorization", "Bearer your_token_here")

If you need to carry cookies, there are two ways:

  • Set Cookie in the header directly
  • Use Jar to implement automatic management of cookies (for multiple requests)
 jar, _ := cookiejar.New(nil)
client := &http.Client{
    Jar: jar,
}

Frequently Asked Questions and Precautions

  • Don't forget to close Body : every time you finish the request, you must call resp.Body.Close() , otherwise the resources will be leaked.

  • Don't reuse the req object error : a *http.Request can only be sent once.

  • Note User-Agent : Some websites will block the default Go UA, and you can add it manually:

     req.Header.Set("User-Agent", "Mozilla/5.0")
  • HTTPS skip certificate verification (for testing) : Skip is not recommended in production environment, but sometimes it is required for development and debugging:

     tr := &http.Transport{
        TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
    }
    client := &http.Client{Transport: tr}

    Basically that's it. Although Go's net/http package looks a bit "primitive", it is powerful and flexible, suitable for building various HTTP client behaviors. As long as you are familiar with the basic usage, most scenarios can be handled.

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