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December 18, 2018 13:11
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Stacked http.Handler in golang
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| // | |
| // Stacking net/http handlers | |
| // vyskocilm.github.io/blog | |
| // | |
| package main | |
| import ( | |
| "fmt" | |
| "log" | |
| "net/http" | |
| ) | |
| // "middleware", some code run BEFORE business handlers | |
| // note that it CONSUME http.Handler and return http.Handler | |
| func Middleware(h http.Handler) http.Handler { | |
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | |
| log.Printf("Middleware: ...") | |
| w.Header().Set("x-middleware", "Middleware") | |
| h.ServeHTTP(w, r) | |
| log.Printf("... Middleware") | |
| }) | |
| } | |
| func main() { | |
| mux := http.NewServeMux() | |
| // register business logic handler | |
| mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { | |
| log.Printf("mux.HandleFunc(\"/\")") | |
| fmt.Fprintf(w, "<html>Hello world</html>\n") | |
| }) | |
| // wrap the middleware | |
| handler := Middleware(mux) | |
| // call the handler | |
| log.Fatal(http.ListenAndServe(":8000", handler)) | |
| } |
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