How to Set HTTP Response Headers in a Go Web Server using gorilla/mux?

Setting Headers in a Go HTTP Server

When developing web APIs, it's often necessary to set HTTP headers on response objects to control the behavior of the browser. In Go, using gorilla/mux and net/http to build a web server, setting response headers is a straightforward process.

Consider this example, which aims to allow cross-domain AJAX requests by setting the "Access-Control-Allow-Origin" header to "*":

package main

import (
    "net/http"
    "github.com/gorilla/mux"
)

func saveHandler(w http.ResponseWriter, r *http.Request) {
    // allow cross domain AJAX requests
    w.Header().Set("Access-Control-Allow-Origin", "*")
}

func main() {
    r := mux.NewRouter()
    r.HandleFunc("/save", saveHandler)
    http.Handle("/", r)
    http.ListenAndServe(":"+port, nil)
}

The key to setting response headers is the Header() method on the ResponseWriter object:

• w.Header().Set(): Sets the header to the specified value.

In this case, the code uses w.Header().Set("Access-Control-Allow-Origin", "*") to add the desired header and value. The result will be an HTTP response with the "Access-Control-Allow-Origin" header set to "*".

This simple method allows you to control the HTTP headers sent with your server's responses, enabling features such as Cross-Origin Resource Sharing (CORS).

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