How can you enable CORS on your Go Web Application ?

This article assumes you knew already what is CORS and how it works and you just wish to enable it on your web server.

Enabling CORS (Cross-Origin Resource Sharing) in a GoLang server involves setting the appropriate headers to allow or restrict cross-origin requests. Here’s a basic example using the net/http package:

package main
import (
"net/http"
)
func enableCors(w *http.ResponseWriter) {
(*w).Header().Set("Access-Control-Allow-Origin", "*")
(*w).Header().Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS, PUT, DELETE")
(*w).Header().Set("Access-Control-Allow-Headers", "Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With")
}
func handleRequest(w http.ResponseWriter, r *http.Request) {
enableCors(&w)
// Your handler logic goes here
// Example: Writing a response
w.Write([]byte("Hello, CORS!"))
}
func main() {
http.HandleFunc("/", handleRequest)
http.ListenAndServe(":8080", nil)
}

In this example:

• The enableCors function sets the necessary CORS headers.
• The handleRequest function is the handler for your routes. Make sure to call enableCors at the beginning of this function.
• You can replace the example logic in handleRequest with your own application logic.