The http.ServeMux multiplexer
http.ServeMux is an HTTP request multiplexer- It matches the URL of each incoming request against a list of registered patterns
- It calls the handler for the pattern that most closely matches the URL
- For example, the pattern
/static/ matches all paths that begin with /static/
- The pattern
/ matches all paths
- It implements the
http.Handler interface, so that it can be used as a handler
Examples
Simple static web server
package main
import (
"fmt"
"net/http"
)
func index(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Welcome to the home page!")
}
func main() {
mux := http.NewServeMux()
mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("/var/www"))))
mux.HandleFunc("/", index)
http.ListenAndServe(":8080", mux)
}
APIs
package main
import (
"net/http"
"./pkg/cache"
"./pkg/httpx"
"./pkg/jsoncache"
"./pkg/users"
)
func main() {
mux := http.NewServeMux()
mux.Handle("/api/v1/cache/", httpx.MethodWrapper(cache.NewHandler()))
mux.Handle("/api/v1/json-cache/", httpx.MethodWrapper(jsoncache.NewHandler()))
mux.Handle("/api/v1/users/", httpx.MethodWrapper(users.NewHandler()))
// ...
http.ListenAndServe(":8080", mux)
}
Links
