How Do I Set HTTP Headers in Go?

Setting HTTP Headers in Go

When developing a web server in Go, occasionally it may become necessary to set HTTP headers on requests. This is where the gorilla/mux and net/http libraries prove useful.

Setting Response Headers

To set an HTTP header on a response, simply use the Set() method of the Header() method on the ResponseWriter:

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

Example Usage

In this example, we set the "Access-Control-Allow-Origin" header to "*", allowing cross-domain AJAX requests.

Gotchas

Ensure your saveHandler function includes the necessary import at the top:

import (
    "net/http"
)

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