How to Integrate Middleware and Prevent Memory Leaks in Gorilla Mux?

Middleware Integration in Gorilla mux

When utilizing Gorilla mux for routing, a common requirement is to include a middleware that processes each incoming request. This article provides a comprehensive solution to this integration.

To establish a middleware, create a wrapper function:

func Middleware(h http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        log.Println("middleware", r.URL)
        h.ServeHTTP(w, r)
    })
}

This wrapper logs the request URL and passes control to the subsequent handler.

To utilize this middleware with Gorilla mux:

r := mux.NewRouter()
r.HandleFunc("/", HomeHandler)
http.Handle("/", Middleware(r))

In this configuration, the middleware handles all requests routed by mux to the path "/".

Addressing Gorilla/Sessions Memory Leak Prevention

To prevent the memory leak issue when not using Gorilla/mux, follow the recommendation:

http.ListenAndServe(":"+portstring, context.ClearHandler(r))

This wraps the router with context.ClearHandler to avoid memory leaks.

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