How to Combine Multiple http.ServeMux Instances on the Same Port?

Combining Multiple http.ServeMux Instances

To serve multiple http.ServeMux instances at the same network address and port, the combinedMux function can be implemented as follows:

<code class="go">func combineMux(muxes ...*http.ServeMux) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        var h http.Handler

        for _, mux := range muxes {
            if h = mux.Handler(r); h != nil {
                h.ServeHTTP(w, r)
                return
            }
        }

        http.NotFound(w, r)
    })
}</code>

This function creates a new http.Handler that iterates through the provided ServeMux instances and serves the first matching handler for the given request. If none are found, a 404 Not Found response is returned.

Alternative Approach: Nesting ServeMux Instances

An alternative way to achieve the same result is to nest the ServeMux instances within each other. This is possible because an http.ServeMux implements the http.Handler interface.

For example, to serve muxA and muxB on the same port and host using this approach:

<code class="go">rootMux := http.NewServeMux()
rootMux.Handle("/muxa/", muxA)
rootMux.Handle("/muxb/", muxB)
http.ListenAndServe(":8080", rootMux)</code>

In this case, the rootMux will handle all requests to its root URL, and it will delegate requests to /muxa/ and /muxb/ to the corresponding ServeMux instances. Note that each nested ServeMux will need to handle its own subpath prefix (e.g., /muxa/ for muxA).

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