How to use gorilla mux with http.TimeoutHandler - go

Question

In an HTTP server written in go, I use gorilla/mux for routing,
I want to use http.TimeoutHandler (and/or other "middleware") but I can't understand where I can fit them.
To make it clear:
I create a new Router by gorillaMux := mux.NewRouter()
add my routes by calls like gorillaMux.HandleFunc("/", rootHandler)
I create the server by server := &http.Server{Addr:":1234"} and server.ListenAndServe()
Where can I insert the http.TimeoutHandler or any other middleware for that matter?

Answer 1

Here is how you can do this:
package main
import (
"fmt"
"github.com/gorilla/mux"
"net/http"
"time"
)
func rootHandler(w http.ResponseWriter, r *http.Request) {
time.Sleep(5 * time.Second)
fmt.Fprintf(w, "Hello!")
}
func main() {
mux := mux.NewRouter()
mux.HandleFunc("/", rootHandler)
muxWithMiddlewares := http.TimeoutHandler(mux, time.Second*3, "Timeout!")
http.ListenAndServe(":8080", muxWithMiddlewares)
}
If you have more than one HTTP handler, you can stack them up:
// this is quite synthetic and ugly example, but it illustrates how Handlers works
muxWithMiddlewares := http.StripPrefix("/api", http.TimeoutHandler(mux, time.Second*3, "Timeout!"))

Answer 2

This solution does not answer the use TimeoutHandler. I posted this here in case anybody wants fine-grain control of their server timeout. This alternative will allow one to define the IdleTimeout and RequestHeaderTimeout if necessary. I am using both gorilla/mux and gorilla/handlers in this example. Hope it helps.
// ReadTimeout is a timing constraint on the client http request imposed by the server from the moment
// of initial connection up to the time the entire request body has been read.
// [Accept] --> [TLS Handshake] --> [Request Headers] --> [Request Body] --> [Response]
// WriteTimeout is a time limit imposed on client connecting to the server via http from the
// time the server has completed reading the request header up to the time it has finished writing the response.
// [Accept] --> [TLS Handshake] --> [Request Headers] --> [Request Body] --> [Response]
func main() {
mux := router.EpicMux()
srv := &http.Server{
Handler: handlers.LoggingHandler(os.Stdout, mux),
Addr: "localhost:8080",
WriteTimeout: 15 * time.Second,
ReadTimeout: 15 * time.Second,
}
log.Fatal(srv.ListenAndServe())
}
func EpicMux() http.Handler {
r := mux.NewRouter()
r.HandleFunc("/", BaseURLRouter).Methods(http.MethodGet)
// create the subroutes for v1 and v2
v1 := r.PathPrefix("api/v1").Subrouter()
// register handlers to appropriate version
v1.HandleFunc("/person", PersonHandlerV1).Methods(http.MethodPost)
v2 := r.PathPrefix("api/v2").Subrouter()
v2.HandleFunc("/person", PersonHandlerV2).Methods(http.MethodPost)
return r
}