How to use Golang to make interface requests

Golang is a programming language suitable for building high-performance applications, especially for network application development. In the process of using Golang for network development, it is often necessary to use HTTP Client to make interface requests. This article will introduce how to use Golang to make interface requests.

1. Golang’s HTTP library

Golang provides the standard library net/http to perform HTTP Client related operations. This library can be used to easily perform GET, POST and other request operations. The following is an example of a GET request:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    url := "https://jsonplaceholder.typicode.com/posts/1"
    resp, err := http.Get(url)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    fmt.Println("Status Code:", resp.StatusCode)
}

This example shows the process of using the http.Get() method to make a GET request, where url is the request address, resp is the response result, and err is the error message. If the request is successful, we can get the response result through resp. It should be noted that since resp.Body belongs to an io.ReadCloser interface, the interface needs to be closed after obtaining the results.

In the actual development process, the requested address may need to add some Header, Cookie and other information. At this time, you can use the http.NewRequest() method to reconstruct a request object to achieve:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    url := "https://jsonplaceholder.typicode.com/posts"

    req, err := http.NewRequest("POST", url, nil)
    if err != nil {
        panic(err)
    }
    req.Header.Add("Content-Type", "application/json")
    req.Header.Add("Cookie", "name=value")

    client := http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    fmt.Println("Status Code:", resp.StatusCode)
}

This example shows how to reconstruct a Request object and add Header and Cookie information to it. Note that in this example we are not adding specific data to the request, so we are passing nil as the parameter.

2. Golang’s third-party HTTP library

In addition to Golang’s own HTTP library, there are many third-party libraries that can perform HTTP requests, such as: GoRequest, Gentleman, Resty, etc.

Among them, Resty is a relatively easy-to-use third-party library. The library supports comprehensive functions, including requests for HTTP methods such as GET, POST, PUT, and DELETE, and supports Header, Cookie, Body, and Query Parameter. When setting data, you can also set Timeout and perform concurrent processing of network requests. The following is an example of a Resty GET request:

package main

import (
    "fmt"
    "github.com/go-resty/resty/v2"
)

func main() {
    url := "https://jsonplaceholder.typicode.com/posts/1"

    client := resty.New()
    resp, err := client.R().Get(url)
    if err != nil {
        panic(err)
    }

    fmt.Println("Status Code:", resp.StatusCode())
}

It should be noted that in the process of using Resty to make a request, we need to first create a new Resty client, and then create a request object through the R() method , and set the corresponding method. A default client can be created and set via the GetClient() method.

3. Summary

This article introduces the method of using Golang to make interface requests, including the standard library net/http and the third-party library Resty. When using it, we need to choose according to the specific situation and choose the corresponding method according to different needs to achieve the best effect.

Whether you use the standard library or a third-party library, Golang's HTTP request method is very convenient and can quickly achieve our needs. If you encounter problems related to HTTP requests in network development, you might as well try Golang's HTTP request method.

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