How to Set HTTP Headers in Go with Gorilla/Mux and net/http?

Setting HTTP Headers in Go with Gorilla/Mux and Net/HTTP

In a Go web server using Gorilla/Mux and net/http, it's often necessary to set HTTP headers for various purposes. One common scenario is to enable cross domain AJAX by setting the Access-Control-Allow-Origin header to allow requests from any domain.

The provided Go code includes a handler function saveHandler that processes request data and a main function that sets up the router and starts the web server. However, the initial handlers do not set any HTTP headers.

To set an HTTP response header, use the Set() method on the Header() property of the http.ResponseWriter passed to the handler function. For example:

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
}

By calling w.Header().Set() with the header name and value, you can set the desired HTTP header for the response. In this case, the Access-Control-Allow-Origin header is set to "*".

Remember, the syntax w.Header().Set(headerName, headerValue) is crucial for setting the header correctly. The net/http package also provides additional methods for more complex header manipulation, allowing you to set or add multiple values to a header. Refer to the official Go documentation for further details.

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