net/http: add example for http.HandleFunc

Change-Id: Id0e2fb2abad5b776ac0ed76e55e36c6b774b5b7a
Reviewed-on: https://go-review.googlesource.com/132278
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/net/http/example_test.go

@@ -159,3 +159,17 @@ func ExampleListenAndServe() {
 	http.HandleFunc("/hello", helloHandler)
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }
+
+func ExampleHandleFunc() {
+	h1 := func(w http.ResponseWriter, _ *http.Request) {
+		io.WriteString(w, "Hello from a HandleFunc #1!\n")
+	}
+	h2 := func(w http.ResponseWriter, _ *http.Request) {
+		io.WriteString(w, "Hello from a HandleFunc #2!\n")
+	}
+
+	http.HandleFunc("/", h1)
+	http.HandleFunc("/endpoint", h2)
+
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}