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example
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helloserver: add basic hello world web server 

We want to revive golang.org/x/example as a test case for
an experiment with a 'gonew' command.

This CL adds a basic "hello, world" web server as
golang.org/x/example/helloserver.

Change-Id: Icf76c756f7b256285d4c5e6a33655996597eb2da
Reviewed-on: https://go-review.googlesource.com/c/example/+/513997
Auto-Submit: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Cameron Balahan <cbalahan@google.com>
This commit is contained in:
Russ Cox 2023-07-28 15:06:57 -04:00 коммит произвёл Gopher Robot
Родитель 1bcfdd08c5
Коммит 3dc2413024
2 изменённых файлов: 79 добавлений и 0 удалений
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4
helloserver/go.mod Normal file
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module golang.org/x/example/helloserver
go 1.19

75
helloserver/server.go Normal file
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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Hello is a simple hello, world demonstration web server.
//
// It serves version information on /version and answers
// any other request like /name by saying "Hello, name!".
//
// See golang.org/x/example/outyet for a more sophisticated server.
package main
import (
"flag"
"fmt"
"html"
"log"
"net/http"
"os"
"runtime/debug"
"strings"
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: helloserver [options]\n")
flag.PrintDefaults()
os.Exit(2)
}
var (
greeting = flag.String("g", "Hello", "Greet with `greeting`")
addr = flag.String("addr", "localhost:8080", "address to serve")
)
func main() {
// Parse flags.
flag.Usage = usage
flag.Parse()
// Parse and validate arguments (none).
args := flag.Args()
if len(args) != 0 {
usage()
}
// Register handlers.
// All requests not otherwise mapped with go to greet.
// /version is mapped specifically to version.
http.HandleFunc("/", greet)
http.HandleFunc("/version", version)
log.Printf("serving http://%s\n", *addr)
log.Fatal(http.ListenAndServe(*addr, nil))
}
func version(w http.ResponseWriter, r *http.Request) {
info, ok := debug.ReadBuildInfo()
if !ok {
http.Error(w, "no build information available", 500)
return
}
fmt.Fprintf(w, "<!DOCTYPE html>\n<pre>\n")
fmt.Fprintf(w, "%s\n", html.EscapeString(info.String()))
}
func greet(w http.ResponseWriter, r *http.Request) {
name := strings.Trim(r.URL.Path, "/")
if name == "" {
name = "Gopher"
}
fmt.Fprintf(w, "<!DOCTYPE html>\n")
fmt.Fprintf(w, "Hello, %s!\n", html.EscapeString(name))
}