How to Set HTTP Response Headers in Go with Gorilla/Mux?

Setting HTTP Headers in Go Web Server with Gorilla/Mux

When building RESTful APIs or web applications with Go, setting HTTP headers is crucial for handling cross-domain requests or customizing the server response. This brief article guides you through the process of setting HTTP headers using the Gorilla/Mux package, addressing a common issue faced by programmers.

The Problem: Setting Response Headers

The provided Go code demonstrates how to handle incoming requests using Gorilla/Mux but lacks the implementation for setting response headers. The net/http package offers documentation for sending HTTP headers as a client, but it does not explicitly describe how to set response headers.

The Solution: The Set() Method

The solution lies in utilizing the Set() method available within the Header() method. Adding the following line to the saveHandler function will enable cross-domain AJAX requests:

w.Header().Set("Access-Control-Allow-Origin", "*")

The Revised Handler

The updated saveHandler function now looks like this:

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

Conclusion

By understanding the proper usage of the Set() method, developers can effortlessly set HTTP headers in their Go web servers using Gorilla/Mux. This enables them to handle cross-domain requests and customize server responses with ease.

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