How do I add CORS headers safely?

To safely add CORS (Cross-Origin Resource Sharing) headers in a Go application, you can use the built-in `net/http` package. The following example demonstrates how to set up a simple HTTP server that includes the necessary CORS headers to allow specific origins.


        package main

        import (
            "fmt"
            "net/http"
        )

        func handler(w http.ResponseWriter, r *http.Request) {
            // Add CORS headers
            w.Header().Set("Access-Control-Allow-Origin", "http://example.com") // replace with your allowed origin
            w.Header().Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
            w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
            
            if r.Method == "OPTIONS" {
                // If it's a preflight request, just return
                w.WriteHeader(http.StatusOK)
                return
            }

            // Your normal handler logic here
            fmt.Fprintf(w, "Hello, CORS enabled world!")
        }

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

How do I add CORS headers safely?

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How do I add CORS headers safely?

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