http2/h2demo/h2demo.go - external/github.com/bradfitz/http2 - Git at Google

 // Copyright 2014 The Go Authors.
 // See https://code.google.com/p/go/source/browse/CONTRIBUTORS
 // Licensed under the same terms as Go itself:
 // https://code.google.com/p/go/source/browse/LICENSE

 // +build h2demo

 package main

 import (
 	"bytes"
 	"crypto/tls"
 	"flag"
 	"fmt"
 	"hash/crc32"
 	"image"
 	"image/jpeg"
 	"io"
 	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
 	"os/exec"
 	"path"
 	"regexp"
 	"runtime"
 	"strconv"
 	"strings"
 	"sync"
 	"time"

 	"camlistore.org/pkg/googlestorage"
 	"camlistore.org/pkg/singleflight"
 	"golang.org/x/net/http2"
 )

 var (
 	openFirefox = flag.Bool("openff", false, "Open Firefox")
 	addr        = flag.String("addr", "localhost:4430", "TLS address to listen on")
 	httpAddr    = flag.String("httpaddr", "", "If non-empty, address to listen for regular HTTP on")
 	prod        = flag.Bool("prod", false, "Whether to configure itself to be the production http2.golang.org server.")
 )

 func homeOldHTTP(w http.ResponseWriter, r *http.Request) {
 	io.WriteString(w, `<html>
 <body>
 <h1>Go + HTTP/2</h1>
 <p>Welcome to <a href="https://golang.org/">the Go language</a>'s <a href="https://http2.github.io/">HTTP/2</a> demo & interop server.</p>
 <p>Unfortunately, you're <b>not</b> using HTTP/2 right now. To do so:</p>
 <ul>
    <li>Use Firefox Nightly or go to <b>about:config</b> and enable "network.http.spdy.enabled.http2draft"</li>
    <li>Use Google Chrome Canary and/or go to <b>chrome://flags/#enable-spdy4</b> to <i>Enable SPDY/4</i> (Chrome's name for HTTP/2)</li>
 </ul>
 <p>See code & instructions for connecting at <a href="https://github.com/golang/net/tree/master/http2">https://github.com/golang/net/tree/master/http2</a>.</p>

 </body></html>`)
 }

 func home(w http.ResponseWriter, r *http.Request) {
 	if r.URL.Path != "/" {
 		http.NotFound(w, r)
 		return
 	}
 	io.WriteString(w, `<html>
 <body>
 <h1>Go + HTTP/2</h1>

 <p>Welcome to <a href="https://golang.org/">the Go language</a>'s <a
 href="https://http2.github.io/">HTTP/2</a> demo & interop server.</p>

 <p>Congratulations, <b>you're using HTTP/2 right now</b>.</p>

 <p>This server exists for others in the HTTP/2 community to test their HTTP/2 client implementations and point out flaws in our server.</p>

 <p> The code is currently at <a
 href="https://golang.org/x/net/http2">github.com/bradfitz/http2</a>
 but will move to the Go standard library at some point in the future
 (enabled by default, without users needing to change their code).</p>

 <p>Contact info: <i>bradfitz@golang.org</i>, or <a
 href="https://golang.org/x/net/http2/issues">file a bug</a>.</p>

 <h2>Handlers for testing</h2>
 <ul>
   <li>GET <a href="/reqinfo">/reqinfo</a> to dump the request + headers received</li>
   <li>GET <a href="/clockstream">/clockstream</a> streams the current time every second</li>
   <li>GET <a href="/gophertiles">/gophertiles</a> to see a page with a bunch of images</li>
   <li>GET <a href="/file/gopher.png">/file/gopher.png</a> for a small file (does If-Modified-Since, Content-Range, etc)</li>
   <li>GET <a href="/file/go.src.tar.gz">/file/go.src.tar.gz</a> for a larger file (~10 MB)</li>
   <li>GET <a href="/redirect">/redirect</a> to redirect back to / (this page)</li>
   <li>GET <a href="/goroutines">/goroutines</a> to see all active goroutines in this server</li>
   <li>PUT something to <a href="/crc32">/crc32</a> to get a count of number of bytes and its CRC-32</li>
 </ul>

 </body></html>`)
 }

 func reqInfoHandler(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "text/plain")
 	fmt.Fprintf(w, "Method: %s\n", r.Method)
 	fmt.Fprintf(w, "Protocol: %s\n", r.Proto)
 	fmt.Fprintf(w, "Host: %s\n", r.Host)
 	fmt.Fprintf(w, "RemoteAddr: %s\n", r.RemoteAddr)
 	fmt.Fprintf(w, "RequestURI: %q\n", r.RequestURI)
 	fmt.Fprintf(w, "URL: %#v\n", r.URL)
 	fmt.Fprintf(w, "Body.ContentLength: %d (-1 means unknown)\n", r.ContentLength)
 	fmt.Fprintf(w, "Close: %v (relevant for HTTP/1 only)\n", r.Close)
 	fmt.Fprintf(w, "TLS: %#v\n", r.TLS)
 	fmt.Fprintf(w, "\nHeaders:\n")
 	r.Header.Write(w)
 }

 func crcHandler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != "PUT" {
 		http.Error(w, "PUT required.", 400)
 		return
 	}
 	crc := crc32.NewIEEE()
 	n, err := io.Copy(crc, r.Body)
 	if err == nil {
 		w.Header().Set("Content-Type", "text/plain")
 		fmt.Fprintf(w, "bytes=%d, CRC32=%x", n, crc.Sum(nil))
 	}
 }

 var (
 	fsGrp   singleflight.Group
 	fsMu    sync.Mutex // guards fsCache
 	fsCache = map[string]http.Handler{}
 )

 // fileServer returns a file-serving handler that proxies URL.
 // It lazily fetches URL on the first access and caches its contents forever.
 func fileServer(url string) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		hi, err := fsGrp.Do(url, func() (interface{}, error) {
 			fsMu.Lock()
 			if h, ok := fsCache[url]; ok {
 				fsMu.Unlock()
 				return h, nil
 			}
 			fsMu.Unlock()

 			res, err := http.Get(url)
 			if err != nil {
 				return nil, err
 			}
 			defer res.Body.Close()
 			slurp, err := ioutil.ReadAll(res.Body)
 			if err != nil {
 				return nil, err
 			}

 			modTime := time.Now()
 			var h http.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 				http.ServeContent(w, r, path.Base(url), modTime, bytes.NewReader(slurp))
 			})
 			fsMu.Lock()
 			fsCache[url] = h
 			fsMu.Unlock()
 			return h, nil
 		})
 		if err != nil {
 			http.Error(w, err.Error(), 500)
 			return
 		}
 		hi.(http.Handler).ServeHTTP(w, r)
 	})
 }

 func clockStreamHandler(w http.ResponseWriter, r *http.Request) {
 	clientGone := w.(http.CloseNotifier).CloseNotify()
 	w.Header().Set("Content-Type", "text/plain")
 	ticker := time.NewTicker(1 * time.Second)
 	defer ticker.Stop()
 	fmt.Fprintf(w, "# ~1KB of junk to force browsers to start rendering immediately: \n")
 	io.WriteString(w, strings.Repeat("# xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\n", 13))

 	for {
 		fmt.Fprintf(w, "%v\n", time.Now())
 		w.(http.Flusher).Flush()
 		select {
 		case <-ticker.C:
 		case <-clientGone:
 			log.Printf("Client %v disconnected from the clock", r.RemoteAddr)
 			return
 		}
 	}
 }

 func registerHandlers() {
 	tiles := newGopherTilesHandler()

 	mux2 := http.NewServeMux()
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		if r.TLS == nil {
 			if r.URL.Path == "/gophertiles" {
 				tiles.ServeHTTP(w, r)
 				return
 			}
 			http.Redirect(w, r, "https://http2.golang.org/", http.StatusFound)
 			return
 		}
 		if r.ProtoMajor == 1 {
 			if r.URL.Path == "/reqinfo" {
 				reqInfoHandler(w, r)
 				return
 			}
 			homeOldHTTP(w, r)
 			return
 		}
 		mux2.ServeHTTP(w, r)
 	})
 	mux2.HandleFunc("/", home)
 	mux2.Handle("/file/gopher.png", fileServer("https://golang.org/doc/gopher/frontpage.png"))
 	mux2.Handle("/file/go.src.tar.gz", fileServer("https://storage.googleapis.com/golang/go1.4.1.src.tar.gz"))
 	mux2.HandleFunc("/reqinfo", reqInfoHandler)
 	mux2.HandleFunc("/crc32", crcHandler)
 	mux2.HandleFunc("/clockstream", clockStreamHandler)
 	mux2.Handle("/gophertiles", tiles)
 	mux2.HandleFunc("/redirect", func(w http.ResponseWriter, r *http.Request) {
 		http.Redirect(w, r, "/", http.StatusFound)
 	})
 	stripHomedir := regexp.MustCompile(`/(Users|home)/\w+`)
 	mux2.HandleFunc("/goroutines", func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 		buf := make([]byte, 2<<20)
 		w.Write(stripHomedir.ReplaceAll(buf[:runtime.Stack(buf, true)], nil))
 	})
 }

 func newGopherTilesHandler() http.Handler {
 	const gopherURL = "https://blog.golang.org/go-programming-language-turns-two_gophers.jpg"
 	res, err := http.Get(gopherURL)
 	if err != nil {
 		log.Fatal(err)
 	}
 	if res.StatusCode != 200 {
 		log.Fatalf("Error fetching %s: %v", gopherURL, res.Status)
 	}
 	slurp, err := ioutil.ReadAll(res.Body)
 	res.Body.Close()
 	if err != nil {
 		log.Fatal(err)
 	}
 	im, err := jpeg.Decode(bytes.NewReader(slurp))
 	if err != nil {
 		if len(slurp) > 1024 {
 			slurp = slurp[:1024]
 		}
 		log.Fatalf("Failed to decode gopher image: %v (got %q)", err, slurp)
 	}

 	type subImager interface {
 		SubImage(image.Rectangle) image.Image
 	}
 	const tileSize = 32
 	xt := im.Bounds().Max.X / tileSize
 	yt := im.Bounds().Max.Y / tileSize
 	var tile [][][]byte // y -> x -> jpeg bytes
 	for yi := 0; yi < yt; yi++ {
 		var row [][]byte
 		for xi := 0; xi < xt; xi++ {
 			si := im.(subImager).SubImage(image.Rectangle{
 				Min: image.Point{xi * tileSize, yi * tileSize},
 				Max: image.Point{(xi + 1) * tileSize, (yi + 1) * tileSize},
 			})
 			buf := new(bytes.Buffer)
 			if err := jpeg.Encode(buf, si, &jpeg.Options{Quality: 90}); err != nil {
 				log.Fatal(err)
 			}
 			row = append(row, buf.Bytes())
 		}
 		tile = append(tile, row)
 	}
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		ms, _ := strconv.Atoi(r.FormValue("latency"))
 		const nanosPerMilli = 1e6
 		if r.FormValue("x") != "" {
 			x, _ := strconv.Atoi(r.FormValue("x"))
 			y, _ := strconv.Atoi(r.FormValue("y"))
 			if ms <= 1000 {
 				time.Sleep(time.Duration(ms) * nanosPerMilli)
 			}
 			if x >= 0 && x < xt && y >= 0 && y < yt {
 				http.ServeContent(w, r, "", time.Time{}, bytes.NewReader(tile[y][x]))
 				return
 			}
 		}
 		io.WriteString(w, "<html><body>")
 		fmt.Fprintf(w, "A grid of %d tiled images is below. Compare:<p>", xt*yt)
 		for _, ms := range []int{0, 30, 200, 1000} {
 			d := time.Duration(ms) * nanosPerMilli
 			fmt.Fprintf(w, "[<a href='https://%s/gophertiles?latency=%d'>HTTP/2, %v latency</a>] [<a href='http://%s/gophertiles?latency=%d'>HTTP/1, %v latency</a>]<br>\n",
 				httpsHost(), ms, d,
 				httpHost(), ms, d,
 			)
 		}
 		io.WriteString(w, "<p>\n")
 		cacheBust := time.Now().UnixNano()
 		for y := 0; y < yt; y++ {
 			for x := 0; x < xt; x++ {
 				fmt.Fprintf(w, "<img width=%d height=%d src='/gophertiles?x=%d&y=%d&cachebust=%d&latency=%d'>",
 					tileSize, tileSize, x, y, cacheBust, ms)
 			}
 			io.WriteString(w, "<br/>\n")
 		}
 		io.WriteString(w, "<hr><a href='/'>&lt;&lt Back to Go HTTP/2 demo server</a></body></html>")
 	})
 }

 func httpsHost() string {
 	if *prod {
 		return "http2.golang.org"
 	}
 	if v := *addr; strings.HasPrefix(v, ":") {
 		return "localhost" + v
 	} else {
 		return v
 	}
 }

 func httpHost() string {
 	if *prod {
 		return "http2.golang.org"
 	}
 	if v := *httpAddr; strings.HasPrefix(v, ":") {
 		return "localhost" + v
 	} else {
 		return v
 	}
 }

 func serveProdTLS() error {
 	c, err := googlestorage.NewServiceClient()
 	if err != nil {
 		return err
 	}
 	slurp := func(key string) ([]byte, error) {
 		const bucket = "http2-demo-server-tls"
 		rc, _, err := c.GetObject(&googlestorage.Object{
 			Bucket: bucket,
 			Key:    key,
 		})
 		if err != nil {
 			return nil, fmt.Errorf("Error fetching GCS object %q in bucket %q: %v", key, bucket, err)
 		}
 		defer rc.Close()
 		return ioutil.ReadAll(rc)
 	}
 	certPem, err := slurp("http2.golang.org.chained.pem")
 	if err != nil {
 		return err
 	}
 	keyPem, err := slurp("http2.golang.org.key")
 	if err != nil {
 		return err
 	}
 	cert, err := tls.X509KeyPair(certPem, keyPem)
 	if err != nil {
 		return err
 	}
 	srv := &http.Server{
 		TLSConfig: &tls.Config{
 			Certificates: []tls.Certificate{cert},
 		},
 	}
 	http2.ConfigureServer(srv, &http2.Server{})
 	ln, err := net.Listen("tcp", ":443")
 	if err != nil {
 		return err
 	}
 	return srv.Serve(tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, srv.TLSConfig))
 }

 type tcpKeepAliveListener struct {
 	*net.TCPListener
 }

 func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
 	tc, err := ln.AcceptTCP()
 	if err != nil {
 		return
 	}
 	tc.SetKeepAlive(true)
 	tc.SetKeepAlivePeriod(3 * time.Minute)
 	return tc, nil
 }

 func serveProd() error {
 	errc := make(chan error, 2)
 	go func() { errc <- http.ListenAndServe(":80", nil) }()
 	go func() { errc <- serveProdTLS() }()
 	return <-errc
 }

 func main() {
 	var srv http.Server
 	flag.BoolVar(&http2.VerboseLogs, "verbose", false, "Verbose HTTP/2 debugging.")
 	flag.Parse()
 	srv.Addr = *addr

 	registerHandlers()

 	if *prod {
 		*httpAddr = "http2.golang.org"
 		log.Fatal(serveProd())
 	}

 	url := "https://" + *addr + "/"
 	log.Printf("Listening on " + url)
 	http2.ConfigureServer(&srv, &http2.Server{})

 	if *httpAddr != "" {
 		go func() { log.Fatal(http.ListenAndServe(*httpAddr, nil)) }()
 	}

 	go func() {
 		log.Fatal(srv.ListenAndServeTLS("server.crt", "server.key"))
 	}()
 	if *openFirefox && runtime.GOOS == "darwin" {
 		time.Sleep(250 * time.Millisecond)
 		exec.Command("open", "-b", "org.mozilla.nightly", "https://localhost:4430/").Run()
 	}
 	select {}
 }
	// Copyright 2014 The Go Authors.
	// See https://code.google.com/p/go/source/browse/CONTRIBUTORS
	// Licensed under the same terms as Go itself:
	// https://code.google.com/p/go/source/browse/LICENSE

	// +build h2demo

	package main

	import (
	"bytes"
	"crypto/tls"
	"flag"
	"fmt"
	"hash/crc32"
	"image"
	"image/jpeg"
	"io"
	"io/ioutil"
	"log"
	"net"
	"net/http"
	"os/exec"
	"path"
	"regexp"
	"runtime"
	"strconv"
	"strings"
	"sync"
	"time"

	"camlistore.org/pkg/googlestorage"
	"camlistore.org/pkg/singleflight"
	"golang.org/x/net/http2"
	)

	var (
	openFirefox = flag.Bool("openff", false, "Open Firefox")
	addr = flag.String("addr", "localhost:4430", "TLS address to listen on")
	httpAddr = flag.String("httpaddr", "", "If non-empty, address to listen for regular HTTP on")
	prod = flag.Bool("prod", false, "Whether to configure itself to be the production http2.golang.org server.")
	)

	func homeOldHTTP(w http.ResponseWriter, r *http.Request) {
	io.WriteString(w, `<html>
	<body>
	<h1>Go + HTTP/2</h1>
	<p>Welcome to <a href="https://golang.org/">the Go language</a>'s <a href="https://http2.github.io/">HTTP/2</a> demo & interop server.</p>
	<p>Unfortunately, you're <b>not</b> using HTTP/2 right now. To do so:</p>
	<ul>
	<li>Use Firefox Nightly or go to <b>about:config</b> and enable "network.http.spdy.enabled.http2draft"</li>
	<li>Use Google Chrome Canary and/or go to <b>chrome://flags/#enable-spdy4</b> to <i>Enable SPDY/4</i> (Chrome's name for HTTP/2)</li>
	</ul>
	<p>See code & instructions for connecting at <a href="https://github.com/golang/net/tree/master/http2">https://github.com/golang/net/tree/master/http2</a>.</p>

	</body></html>`)
	}

	func home(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path != "/" {
	http.NotFound(w, r)
	return
	}
	io.WriteString(w, `<html>
	<body>
	<h1>Go + HTTP/2</h1>

	<p>Welcome to <a href="https://golang.org/">the Go language</a>'s <a
	href="https://http2.github.io/">HTTP/2</a> demo & interop server.</p>

	<p>Congratulations, <b>you're using HTTP/2 right now</b>.</p>

	<p>This server exists for others in the HTTP/2 community to test their HTTP/2 client implementations and point out flaws in our server.</p>

	<p> The code is currently at <a
	href="https://golang.org/x/net/http2">github.com/bradfitz/http2</a>
	but will move to the Go standard library at some point in the future
	(enabled by default, without users needing to change their code).</p>

	<p>Contact info: <i>bradfitz@golang.org</i>, or <a
	href="https://golang.org/x/net/http2/issues">file a bug</a>.</p>

	<h2>Handlers for testing</h2>
	<ul>
	<li>GET <a href="/reqinfo">/reqinfo</a> to dump the request + headers received</li>
	<li>GET <a href="/clockstream">/clockstream</a> streams the current time every second</li>
	<li>GET <a href="/gophertiles">/gophertiles</a> to see a page with a bunch of images</li>
	<li>GET <a href="/file/gopher.png">/file/gopher.png</a> for a small file (does If-Modified-Since, Content-Range, etc)</li>
	<li>GET <a href="/file/go.src.tar.gz">/file/go.src.tar.gz</a> for a larger file (~10 MB)</li>
	<li>GET <a href="/redirect">/redirect</a> to redirect back to / (this page)</li>
	<li>GET <a href="/goroutines">/goroutines</a> to see all active goroutines in this server</li>
	<li>PUT something to <a href="/crc32">/crc32</a> to get a count of number of bytes and its CRC-32</li>
	</ul>

	</body></html>`)
	}

	func reqInfoHandler(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/plain")
	fmt.Fprintf(w, "Method: %s\n", r.Method)
	fmt.Fprintf(w, "Protocol: %s\n", r.Proto)
	fmt.Fprintf(w, "Host: %s\n", r.Host)
	fmt.Fprintf(w, "RemoteAddr: %s\n", r.RemoteAddr)
	fmt.Fprintf(w, "RequestURI: %q\n", r.RequestURI)
	fmt.Fprintf(w, "URL: %#v\n", r.URL)
	fmt.Fprintf(w, "Body.ContentLength: %d (-1 means unknown)\n", r.ContentLength)
	fmt.Fprintf(w, "Close: %v (relevant for HTTP/1 only)\n", r.Close)
	fmt.Fprintf(w, "TLS: %#v\n", r.TLS)
	fmt.Fprintf(w, "\nHeaders:\n")
	r.Header.Write(w)
	}

	func crcHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != "PUT" {
	http.Error(w, "PUT required.", 400)
	return
	}
	crc := crc32.NewIEEE()
	n, err := io.Copy(crc, r.Body)
	if err == nil {
	w.Header().Set("Content-Type", "text/plain")
	fmt.Fprintf(w, "bytes=%d, CRC32=%x", n, crc.Sum(nil))
	}
	}

	var (
	fsGrp singleflight.Group
	fsMu sync.Mutex // guards fsCache
	fsCache = map[string]http.Handler{}
	)

	// fileServer returns a file-serving handler that proxies URL.
	// It lazily fetches URL on the first access and caches its contents forever.
	func fileServer(url string) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	hi, err := fsGrp.Do(url, func() (interface{}, error) {
	fsMu.Lock()
	if h, ok := fsCache[url]; ok {
	fsMu.Unlock()
	return h, nil
	}
	fsMu.Unlock()

	res, err := http.Get(url)
	if err != nil {
	return nil, err
	}
	defer res.Body.Close()
	slurp, err := ioutil.ReadAll(res.Body)
	if err != nil {
	return nil, err
	}

	modTime := time.Now()
	var h http.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	http.ServeContent(w, r, path.Base(url), modTime, bytes.NewReader(slurp))
	})
	fsMu.Lock()
	fsCache[url] = h
	fsMu.Unlock()
	return h, nil
	})
	if err != nil {
	http.Error(w, err.Error(), 500)
	return
	}
	hi.(http.Handler).ServeHTTP(w, r)
	})
	}

	func clockStreamHandler(w http.ResponseWriter, r *http.Request) {
	clientGone := w.(http.CloseNotifier).CloseNotify()
	w.Header().Set("Content-Type", "text/plain")
	ticker := time.NewTicker(1 * time.Second)
	defer ticker.Stop()
	fmt.Fprintf(w, "# ~1KB of junk to force browsers to start rendering immediately: \n")
	io.WriteString(w, strings.Repeat("# xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\n", 13))

	for {
	fmt.Fprintf(w, "%v\n", time.Now())
	w.(http.Flusher).Flush()
	select {
	case <-ticker.C:
	case <-clientGone:
	log.Printf("Client %v disconnected from the clock", r.RemoteAddr)
	return
	}
	}
	}

	func registerHandlers() {
	tiles := newGopherTilesHandler()

	mux2 := http.NewServeMux()
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
	if r.TLS == nil {
	if r.URL.Path == "/gophertiles" {
	tiles.ServeHTTP(w, r)
	return
	}
	http.Redirect(w, r, "https://http2.golang.org/", http.StatusFound)
	return
	}
	if r.ProtoMajor == 1 {
	if r.URL.Path == "/reqinfo" {
	reqInfoHandler(w, r)
	return
	}
	homeOldHTTP(w, r)
	return
	}
	mux2.ServeHTTP(w, r)
	})
	mux2.HandleFunc("/", home)
	mux2.Handle("/file/gopher.png", fileServer("https://golang.org/doc/gopher/frontpage.png"))
	mux2.Handle("/file/go.src.tar.gz", fileServer("https://storage.googleapis.com/golang/go1.4.1.src.tar.gz"))
	mux2.HandleFunc("/reqinfo", reqInfoHandler)
	mux2.HandleFunc("/crc32", crcHandler)
	mux2.HandleFunc("/clockstream", clockStreamHandler)
	mux2.Handle("/gophertiles", tiles)
	mux2.HandleFunc("/redirect", func(w http.ResponseWriter, r *http.Request) {
	http.Redirect(w, r, "/", http.StatusFound)
	})
	stripHomedir := regexp.MustCompile(`/(Users\|home)/\w+`)
	mux2.HandleFunc("/goroutines", func(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
	buf := make([]byte, 2<<20)
	w.Write(stripHomedir.ReplaceAll(buf[:runtime.Stack(buf, true)], nil))
	})
	}

	func newGopherTilesHandler() http.Handler {
	const gopherURL = "https://blog.golang.org/go-programming-language-turns-two_gophers.jpg"
	res, err := http.Get(gopherURL)
	if err != nil {
	log.Fatal(err)
	}
	if res.StatusCode != 200 {
	log.Fatalf("Error fetching %s: %v", gopherURL, res.Status)
	}
	slurp, err := ioutil.ReadAll(res.Body)
	res.Body.Close()
	if err != nil {
	log.Fatal(err)
	}
	im, err := jpeg.Decode(bytes.NewReader(slurp))
	if err != nil {
	if len(slurp) > 1024 {
	slurp = slurp[:1024]
	}
	log.Fatalf("Failed to decode gopher image: %v (got %q)", err, slurp)
	}

	type subImager interface {
	SubImage(image.Rectangle) image.Image
	}
	const tileSize = 32
	xt := im.Bounds().Max.X / tileSize
	yt := im.Bounds().Max.Y / tileSize
	var tile [][][]byte // y -> x -> jpeg bytes
	for yi := 0; yi < yt; yi++ {
	var row [][]byte
	for xi := 0; xi < xt; xi++ {
	si := im.(subImager).SubImage(image.Rectangle{
	Min: image.Point{xi * tileSize, yi * tileSize},
	Max: image.Point{(xi + 1) * tileSize, (yi + 1) * tileSize},
	})
	buf := new(bytes.Buffer)
	if err := jpeg.Encode(buf, si, &jpeg.Options{Quality: 90}); err != nil {
	log.Fatal(err)
	}
	row = append(row, buf.Bytes())
	}
	tile = append(tile, row)
	}
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	ms, _ := strconv.Atoi(r.FormValue("latency"))
	const nanosPerMilli = 1e6
	if r.FormValue("x") != "" {
	x, _ := strconv.Atoi(r.FormValue("x"))
	y, _ := strconv.Atoi(r.FormValue("y"))
	if ms <= 1000 {
	time.Sleep(time.Duration(ms) * nanosPerMilli)
	}
	if x >= 0 && x < xt && y >= 0 && y < yt {
	http.ServeContent(w, r, "", time.Time{}, bytes.NewReader(tile[y][x]))
	return
	}
	}
	io.WriteString(w, "<html><body>")
	fmt.Fprintf(w, "A grid of %d tiled images is below. Compare:<p>", xt*yt)
	for _, ms := range []int{0, 30, 200, 1000} {
	d := time.Duration(ms) * nanosPerMilli
	fmt.Fprintf(w, "[<a href='https://%s/gophertiles?latency=%d'>HTTP/2, %v latency</a>] [<a href='http://%s/gophertiles?latency=%d'>HTTP/1, %v latency</a>]<br>\n",
	httpsHost(), ms, d,
	httpHost(), ms, d,
	)
	}
	io.WriteString(w, "<p>\n")
	cacheBust := time.Now().UnixNano()
	for y := 0; y < yt; y++ {
	for x := 0; x < xt; x++ {
	fmt.Fprintf(w, "<img width=%d height=%d src='/gophertiles?x=%d&y=%d&cachebust=%d&latency=%d'>",
	tileSize, tileSize, x, y, cacheBust, ms)
	}
	io.WriteString(w, "<br/>\n")
	}
	io.WriteString(w, "<hr><a href='/'><&lt Back to Go HTTP/2 demo server</a></body></html>")
	})
	}

	func httpsHost() string {
	if *prod {
	return "http2.golang.org"
	}
	if v := *addr; strings.HasPrefix(v, ":") {
	return "localhost" + v
	} else {
	return v
	}
	}

	func httpHost() string {
	if *prod {
	return "http2.golang.org"
	}
	if v := *httpAddr; strings.HasPrefix(v, ":") {
	return "localhost" + v
	} else {
	return v
	}
	}

	func serveProdTLS() error {
	c, err := googlestorage.NewServiceClient()
	if err != nil {
	return err
	}
	slurp := func(key string) ([]byte, error) {
	const bucket = "http2-demo-server-tls"
	rc, _, err := c.GetObject(&googlestorage.Object{
	Bucket: bucket,
	Key: key,
	})
	if err != nil {
	return nil, fmt.Errorf("Error fetching GCS object %q in bucket %q: %v", key, bucket, err)
	}
	defer rc.Close()
	return ioutil.ReadAll(rc)
	}
	certPem, err := slurp("http2.golang.org.chained.pem")
	if err != nil {
	return err
	}
	keyPem, err := slurp("http2.golang.org.key")
	if err != nil {
	return err
	}
	cert, err := tls.X509KeyPair(certPem, keyPem)
	if err != nil {
	return err
	}
	srv := &http.Server{
	TLSConfig: &tls.Config{
	Certificates: []tls.Certificate{cert},
	},
	}
	http2.ConfigureServer(srv, &http2.Server{})
	ln, err := net.Listen("tcp", ":443")
	if err != nil {
	return err
	}
	return srv.Serve(tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, srv.TLSConfig))
	}

	type tcpKeepAliveListener struct {
	*net.TCPListener
	}

	func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
	tc, err := ln.AcceptTCP()
	if err != nil {
	return
	}
	tc.SetKeepAlive(true)
	tc.SetKeepAlivePeriod(3 * time.Minute)
	return tc, nil
	}

	func serveProd() error {
	errc := make(chan error, 2)
	go func() { errc <- http.ListenAndServe(":80", nil) }()
	go func() { errc <- serveProdTLS() }()
	return <-errc
	}

	func main() {
	var srv http.Server
	flag.BoolVar(&http2.VerboseLogs, "verbose", false, "Verbose HTTP/2 debugging.")
	flag.Parse()
	srv.Addr = *addr

	registerHandlers()

	if *prod {
	*httpAddr = "http2.golang.org"
	log.Fatal(serveProd())
	}

	url := "https://" + *addr + "/"
	log.Printf("Listening on " + url)
	http2.ConfigureServer(&srv, &http2.Server{})

	if *httpAddr != "" {
	go func() { log.Fatal(http.ListenAndServe(*httpAddr, nil)) }()
	}

	go func() {
	log.Fatal(srv.ListenAndServeTLS("server.crt", "server.key"))
	}()
	if *openFirefox && runtime.GOOS == "darwin" {
	time.Sleep(250 * time.Millisecond)
	exec.Command("open", "-b", "org.mozilla.nightly", "https://localhost:4430/").Run()
	}
	select {}
	}