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))
}
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.
Most Helpful This Week
How to remove multiple spaces in a string in GoLang?
Go program to find SRV service record of a domain
Struct Instantiation using new keyword
Golang program for implementation of Selection Sort
Golang program for implementation of Longest Common Sub-sequence
Go program to find Forward(A) record of a domain
Golang write CSV records
Golang program for implementation of Linear Search
What is state in React?
Golang program for drawing a Cuboid
Most Helpful This Week
How to use array in Go Programming Language?Regular expression to validate the date format in "dd/mm/yyyy"How to kill execution of goroutine?Convert Int data type to Int16 Int32 Int64Convert Float32 to Float64 and Float64 to Float32Sierpinski triangle in Go Programming LanguageExample: Fields and FieldsFunc from BYTES PackageExample: Arrays of Arrays, Arrays of Slices, Slices of Arrays and Slices of SlicesPassing multiple string arguments to a variadic functionRegular expression to extract domain from URL