// Copyright 2017 Google Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to writing, software distributed
// under the License is distributed on a "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"fmt"
	"net/http"
)

type textHandler struct {
	h http.HandlerFunc
}

func (t textHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// Set the content type
	w.Header().Set("Content-Type", "text/plain")
	// Then call ServeHTTP in the decorated handler.
	t.h(w, r)
}

func helloHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintln(w, "hello")
}

func main() {
	http.Handle("/hello", textHandler{helloHandler})
	http.ListenAndServe(":8080", nil)
}
