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How To Make HTTP Requests in Go?

An HTTP request is a message sent by a client (such as a web browser) to a server to request specific information or resources. The request typically includes the HTTP method (such as GET or POST), the URL of the resource being requested, and any necessary headers or data. The server then sends a response back to the client, which can include the requested information, an error message, or a redirect to another resource.
Using net/http
In Go, you can use the built-in net/http package to make HTTP requests. Here is an example of how to make a GET request to a URL:

Example

package main

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

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

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

    fmt.Println(string(body))
}
POST Request Example
You can also use the http.NewRequest() function to create a new request with a specific method (e.g. POST, PUT, etc.) and set headers. Here is an example of how to make a POST request with a JSON payload:

Example

package main

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

func main() {
    jsonData := []byte(`{"name":"John Doe"}`)

    req, err := http.NewRequest("POST", "https://www.example.com/post", bytes.NewBuffer(jsonData))
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    defer resp.Body.Close()

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

    fmt.Println("response Status:", resp.Status)
    fmt.Println("response Headers:", resp.Header)
    fmt.Println("response Body:", string(body))
}
GET Request Example
You can also use the http.NewRequest() function to create a new request and the http.Client.Do() function to send it:

Example

package main

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

func main() {
    req, err := http.NewRequest("GET", "https://www.example.com", nil)
    if err != nil {
        fmt.Println(err)
        return
    }

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

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

    fmt.Println(string(body))
}
You can replace "GET" with "POST", "PUT", "DELETE" or other method.

Additionally, you can also use third-party packages like
golang.org/x/net/context and
github.com/google/go-querystring to make your HTTP request more powerful.
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