How to Customize HTTP 404 Error Handling in Go with HTTProuter?

Customizing HTTP 404 Handling with HTTProuter

HTTProuter provides the ability to handle 404 responses manually. To achieve this, a custom handler function must be defined.

HTTProuter's Router struct possesses a NotFound field of type http.Handler. The http.Handler interface defines a single method, ServeHTTP(ResponseWriter, *Request). Hence, a custom handler must implement this function.

To create a custom handler, define a function with the signature func(http.ResponseWriter, *http.Request). Convert this function to an http.Handler value using the http.HandlerFunc() helper function. For instance:

<code class="go">func MyNotFound(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "text/plain; charset=utf-8")
    w.WriteHeader(http.StatusNotFound) // Set status to 404
    w.Write([]byte("My NotFound handler"))
}

router.NotFound = http.HandlerFunc(MyNotFound)</code>

This custom handler will be triggered by HTTProuter. Alternatively, it can be invoked manually from other handlers by passing the ResponseWriter and *Request instances:

<code class="go">func ResourceHandler(w http.ResponseWriter, r *http.Request) {
    if ... { // Check for resource availability
        router.NotFound(w, r)
        return
    }
    // ... Serve the resource
}</code>

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