added fixed HTTP status code handler

Author: matryer

example/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"fmt"
+	"io"
 	"log"
 	"net/http"
 
@@ -30,3 +31,13 @@ func main() {
 	fmt.Println("listening at http://localhost:8080")
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }
+
+// statusCodeHandler is useful for testing the server by returning a
+// specific HTTP status code.
+//  http.Handle("/", statusCodeHandler(http.StatusInternalServerError))
+type statusCodeHandler int
+
+func (c statusCodeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(int(c))
+	io.WriteString(w, http.StatusText(int(c)))
+}