Golang React JS Technology Blog

How do you handle HTTP responses in Go?

In Go, you can handle HTTP responses using the http.ResponseWriter interface. This interface represents the HTTP response that your server sends back to the client.
HTTP response in Go
Here's an example of how to use the http.ResponseWriter interface to send a JSON response:

Example

package main

import (
    "encoding/json"
    "net/http"
)

type User struct {
    Name  string `json:"name"`
    Email string `json:"email"`
}

func handler(w http.ResponseWriter, r *http.Request) {
    // Create a new user object
    user := User{Name: "John Doe", Email: "johndoe@example.com"}

    // Marshal the user object to JSON
    data, err := json.Marshal(user)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    // Set the Content-Type header
    w.Header().Set("Content-Type", "application/json")

    // Write the JSON data to the response
    w.Write(data)
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

In this example, we define a handler function that creates a User object, marshals it to JSON, and writes the JSON data to the response using the http.ResponseWriter interface.

We first create a new User object and marshal it to JSON using the json.Marshal function. We then set the Content-Type header to application/json using the w.Header().Set method.

Finally, we write the JSON data to the response using the w.Write method. If an error occurs during the marshaling process, we return an HTTP 500 Internal Server Error using the http.Error function.

This is just a simple example, but the http.ResponseWriter interface provides many more methods for handling HTTP responses, such as setting headers, setting cookies, and streaming data back to the client.

Most Helpful This Week
How do you handle HTTP server shutdown gracefully in Go? How do you create an HTTP server in Go? How do you send an HTTP PATCH request in Go? How do you read headers from an HTTP response with an HTTP client in Go? How do you handle HTTP server caching in Go? How do you send an HTTP GET request with an HTTP client in Go? How do you handle HTTP client server compression in Go? What is the default HTTP server in Go? How do you create an HTTP client in Go? How do you handle HTTP authentication with an HTTP client in Go?