Go: How to combine two (or more) http.ServeMux?

Question

Given that you have two instances of http.ServeMux, and you wish for them to be served at the same port number, like so:

    muxA, muxB http.ServeMu         


        

Answer 1

Because an http.ServeMux is also an http.Handler you can easily nest one mux inside another, even on the same port and same hostname. Here's one example of doing that:

rootMux := http.NewServeMux()
subMux := http.NewServeMux()

// This will end up handling /top_path/sub_path
subMux.HandleFunc("/sub_path", myHandleFunc)

// Use the StripPrefix here to make sure the URL has been mapped
// to a path the subMux can read
rootMux.Handle("/top_path/", http.StripPrefix("/top_path", subMux))

http.ListenAndServe(":8000", rootMux)

Note that without that http.StripPrefix() call, you would need to handle the whole path in the lower mux.