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/**
* Copyright 2017 Google Inc.
*
* 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 in writing, software
* distributed under the License is distributed on an "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.
*/
// [START all]
package main
import (
"fmt"
"log"
"net/http"
"os"
)
func main() {
// use PORT environment variable, or default to 8080
port := "8080"
if fromEnv := os.Getenv("PORT"); fromEnv != "" {
port = fromEnv
}
// register hello function to handle all requests
server := http.NewServeMux()
server.HandleFunc("/", hello)
// start the web server on port and accept requests
log.Printf("Server listening on port %s", port)
err := http.ListenAndServe(":"+port, server)
log.Fatal(err)
}
// hello responds to the request with a plain-text "Hello, world" message.
func hello(w http.ResponseWriter, r *http.Request) {
log.Printf("Serving request: %s", r.URL.Path)
host, _ := os.Hostname()
fmt.Fprintf(w, "Hello, world!\n")
fmt.Fprintf(w, "Version: 1.0.0\n")
fmt.Fprintf(w, "Hostname: %s\n", host)
}
// [END all]
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