h2c server

docs/user-guide/grpc.md

@@ -1,30 +1,10 @@
-# gRPC example
+# gRPC examples
 
-This section explains how to use Traefik as reverse proxy for gRPC application with self-signed certificates.
+## With HTTP (h2c)
 
-!!! warning
+This section explains how to use Traefik as reverse proxy for gRPC application.
-    As gRPC needs HTTP2, we need HTTPS certificates on Træfik.
-    For exchanges with the backend, we will use h2c (HTTP2 on HTTP without TLS)
 
-<p align="center">
+### Træfik configuration
-<img src="/img/grpc.svg" alt="gRPC architecture" title="gRPC architecture" />
-</p>
-
-## gRPC Client certificate
-
-Generate your self-signed certificate for frontend url:
-
-```bash
-openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ./frontend.key -out ./frontend.cert
-```
-
-with
-
-```
-Common Name (e.g. server FQDN or YOUR name) []: frontend.local
-```
-
-## Træfik configuration
 
 At last, we configure our Træfik instance to use both self-signed certificates.
 
@@ -32,14 +12,9 @@ At last, we configure our Træfik instance to use both self-signed certificates.
 defaultEntryPoints = ["https"]
 
 [entryPoints]
-  [entryPoints.https]
+  [entryPoints.http]
-  address = ":4443"
+  address = ":80"
-    [entryPoints.https.tls]
+    [entryPoints.http]
-     # For secure connection on frontend.local
-     [[entryPoints.https.tls.certificates]]
-     certFile = "./frontend.cert"
-     keyFile  = "./frontend.key"
-
 
 [api]
 
@@ -62,23 +37,115 @@ defaultEntryPoints = ["https"]
 !!! warning
     For provider with label, you will have to specify the `traefik.protocol=h2c`
 
-## Conclusion
+### Conclusion
 
-We don't need specific configuration to use gRPC in Træfik, we just need to be careful that exchanges between client and Træfik are HTTPS communications.
+We don't need specific configuration to use gRPC in Træfik, we just need to use `h2c` protocol, or use HTTPS communications to have HTTP2 with the backend.
-For exchanges between Træfik and backend, you need to use `h2c` protocol, or use HTTPS communications to have HTTP2.
 
-## A gRPC example in go
+## With HTTPS
 
-We will use the gRPC greeter example in [grpc-go](https://github.com/grpc/grpc-go/tree/master/examples/helloworld)
+This section explains how to use Traefik as reverse proxy for gRPC application with self-signed certificates.
+
+<p align="center">
+<img src="/img/grpc.svg" alt="gRPC architecture" title="gRPC architecture" />
+</p>
+
+### gRPC Server certificate
+
+In order to secure the gRPC server, we generate a self-signed certificate for backend url:
+
+```bash
+openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ./backend.key -out ./backend.cert
+```
+
+That will prompt for information, the important answer is:
+
+```
+Common Name (e.g. server FQDN or YOUR name) []: backend.local
+```
+
+### gRPC Client certificate
+
+Generate your self-signed certificate for frontend url:
+
+```bash
+openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ./frontend.key -out ./frontend.cert
+```
+
+with
+
+```
+Common Name (e.g. server FQDN or YOUR name) []: frontend.local
+```
+
+### Træfik configuration
+
+At last, we configure our Træfik instance to use both self-signed certificates.
+
+```toml
+defaultEntryPoints = ["https"]
+
+# For secure connection on backend.local
+rootCAs = [ "./backend.cert" ]
+
+[entryPoints]
+  [entryPoints.https]
+  address = ":4443"
+    [entryPoints.https.tls]
+     # For secure connection on frontend.local
+     [[entryPoints.https.tls.certificates]]
+     certFile = "./frontend.cert"
+     keyFile  = "./frontend.key"
+
+
+[api]
+
+[file]
+
+[backends]
+  [backends.backend1]
+    [backends.backend1.servers.server1]
+    # Access on backend with HTTPS
+    url = "https://backend.local:8080"
+
+
+[frontends]
+  [frontends.frontend1]
+  backend = "backend1"
+    [frontends.frontend1.routes.test_1]
+    rule = "Host:frontend.local"
+```
+
+!!! warning
+    With some backends, the server URLs use the IP, so you may need to configure `insecureSkipVerify` instead of the `rootCAS` to activate HTTPS without hostname verification.
+
+### A gRPC example in go (modify for https)
+
+We use the gRPC greeter example in [grpc-go](https://github.com/grpc/grpc-go/tree/master/examples/helloworld)
+
+!!! warning
+    In order to use this gRPC example, we need to modify it to use HTTPS
+
+So we modify the "gRPC server example" to use our own self-signed certificate:
 
-We can keep the Server example as is with the h2c protocol
 ```go
 // ...
-lis, err := net.Listen("tcp", port)
+
+// Read cert and key file
+BackendCert, _ := ioutil.ReadFile("./backend.cert")
+BackendKey, _ := ioutil.ReadFile("./backend.key")
+
+// Generate Certificate struct
+cert, err := tls.X509KeyPair(BackendCert, BackendKey)
 if err != nil {
-    log.Fatalf("failed to listen: %v", err)
+  log.Fatalf("failed to parse certificate: %v", err)
 }
-var s *grpc.Server = grpc.NewServer()
+
+// Create credentials
+creds := credentials.NewServerTLSFromCert(&cert)
+
+// Use Credentials in gRPC server options
+serverOption := grpc.Creds(creds)
+var s *grpc.Server = grpc.NewServer(serverOption)
 defer s.Stop()
 
 pb.RegisterGreeterServer(s, &server{})
@@ -87,10 +154,6 @@ err := s.Serve(lis)
 // ...
 ```
 
-!!! warning
-    In order to use this gRPC example, we need to modify it to use HTTPS
-
-
 Next we will modify gRPC Client to use our Træfik self-signed certificate:
 
 ```go

h2c/h2c.go

@@ -0,0 +1,475 @@
+// Copyright 2018 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.
+
+// Package h2c implements the h2c part of HTTP/2.
+//
+// The h2c protocol is the non-TLS secured version of HTTP/2 which is not
+// available from net/http.
+package h2c
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/base64"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/textproto"
+	"os"
+	"strings"
+
+	"github.com/containous/traefik/log"
+
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/hpack"
+	"golang.org/x/net/lex/httplex"
+)
+
+var (
+	http2VerboseLogs bool
+)
+
+func init() {
+	e := os.Getenv("GODEBUG")
+	if strings.Contains(e, "http2debug=1") || strings.Contains(e, "http2debug=2") {
+		http2VerboseLogs = true
+	}
+	http2VerboseLogs = true
+}
+
+// Server implements net.Handler and enables h2c. Users who want h2c just need
+// to provide an http.Server.
+type Server struct {
+	*http.Server
+	originalHandler http.Handler
+}
+
+// Serve Put a middleware around the original handler to handle h2c
+func (s Server) Serve(l net.Listener) error {
+	originalHandler := s.Server.Handler
+	if originalHandler == nil {
+		originalHandler = http.DefaultServeMux
+	}
+	s.Server.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == "PRI" && r.URL.Path == "*" && r.Proto == "HTTP/2.0" {
+			if http2VerboseLogs {
+				log.Debugf("Attempting h2c with prior knowledge.")
+			}
+			conn, err := initH2CWithPriorKnowledge(w)
+			if err != nil {
+				if http2VerboseLogs {
+					log.Debugf("Error h2c with prior knowledge: %v", err)
+				}
+				return
+			}
+			defer conn.Close()
+			h2cSrv := &http2.Server{}
+			h2cSrv.ServeConn(conn, &http2.ServeConnOpts{Handler: originalHandler})
+			return
+		}
+		if conn, err := h2cUpgrade(w, r); err == nil {
+			defer conn.Close()
+			h2cSrv := &http2.Server{}
+			h2cSrv.ServeConn(conn, &http2.ServeConnOpts{Handler: originalHandler})
+			return
+		}
+		originalHandler.ServeHTTP(w, r)
+	})
+	return s.Server.Serve(l)
+}
+
+// initH2CWithPriorKnowledge implements creating a h2c connection with prior
+// knowledge (Section 3.4) and creates a net.Conn suitable for http2.ServeConn.
+// All we have to do is look for the client preface that is suppose to be part
+// of the body, and reforward the client preface on the net.Conn this function
+// creates.
+func initH2CWithPriorKnowledge(w http.ResponseWriter) (net.Conn, error) {
+	hijacker, ok := w.(http.Hijacker)
+	if !ok {
+		return nil, errors.New("hijack not supported")
+	}
+	conn, rw, err := hijacker.Hijack()
+	if err != nil {
+		return nil, fmt.Errorf("hijack failed: %v", err)
+	}
+
+	expectedBody := "SM\r\n\r\n"
+
+	buf := make([]byte, len(expectedBody))
+	n, err := io.ReadFull(rw, buf)
+
+	if bytes.Equal(buf[0:n], []byte(expectedBody)) {
+		c := &rwConn{
+			Conn:      conn,
+			Reader:    io.MultiReader(bytes.NewBuffer([]byte(http2.ClientPreface)), rw),
+			BufWriter: rw.Writer,
+		}
+		return c, nil
+	}
+
+	conn.Close()
+	if http2VerboseLogs {
+		log.Printf(
+			"Missing the request body portion of the client preface. Wanted: %v Got: %v",
+			[]byte(expectedBody),
+			buf[0:n],
+		)
+	}
+	return nil, errors.New("invalid client preface")
+}
+
+// drainClientPreface reads a single instance of the HTTP/2 client preface from
+// the supplied reader.
+func drainClientPreface(r io.Reader) error {
+	var buf bytes.Buffer
+	prefaceLen := int64(len([]byte(http2.ClientPreface)))
+	n, err := io.CopyN(&buf, r, prefaceLen)
+	if err != nil {
+		return err
+	}
+	if n != prefaceLen || buf.String() != http2.ClientPreface {
+		return fmt.Errorf("Client never sent: %s", http2.ClientPreface)
+	}
+	return nil
+}
+
+// h2cUpgrade establishes a h2c connection using the HTTP/1 upgrade (Section 3.2).
+func h2cUpgrade(w http.ResponseWriter, r *http.Request) (net.Conn, error) {
+	if !isH2CUpgrade(r.Header) {
+		return nil, errors.New("non-conforming h2c headers")
+	}
+
+	// Initial bytes we put into conn to fool http2 server
+	initBytes, _, err := convertH1ReqToH2(r)
+	if err != nil {
+		return nil, err
+	}
+
+	hijacker, ok := w.(http.Hijacker)
+	if !ok {
+		return nil, errors.New("hijack not supported")
+	}
+	conn, rw, err := hijacker.Hijack()
+	if err != nil {
+		return nil, fmt.Errorf("hijack failed: %v", err)
+	}
+
+	rw.Write([]byte("HTTP/1.1 101 Switching Protocols\r\n" +
+		"Connection: Upgrade\r\n" +
+		"Upgrade: h2c\r\n\r\n"))
+	rw.Flush()
+
+	// A conforming client will now send an H2 client preface which need to drain
+	// since we already sent this.
+	if err := drainClientPreface(rw); err != nil {
+		return nil, err
+	}
+
+	c := &rwConn{
+		Conn:      conn,
+		Reader:    io.MultiReader(initBytes, rw),
+		BufWriter: newSettingsAckSwallowWriter(rw.Writer),
+	}
+	return c, nil
+}
+
+// convert the data contained in the HTTP/1 upgrade request into the HTTP/2
+// version in byte form.
+func convertH1ReqToH2(r *http.Request) (*bytes.Buffer, []http2.Setting, error) {
+	h2Bytes := bytes.NewBuffer([]byte((http2.ClientPreface)))
+	framer := http2.NewFramer(h2Bytes, nil)
+	settings, err := getH2Settings(r.Header)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if err := framer.WriteSettings(settings...); err != nil {
+		return nil, nil, err
+	}
+
+	headerBytes, err := getH2HeaderBytes(r, getMaxHeaderTableSize(settings))
+	if err != nil {
+		return nil, nil, err
+	}
+
+	maxFrameSize := int(getMaxFrameSize(settings))
+	needOneHeader := len(headerBytes) < maxFrameSize
+	err = framer.WriteHeaders(http2.HeadersFrameParam{
+		StreamID:      1,
+		BlockFragment: headerBytes,
+		EndHeaders:    needOneHeader,
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	for i := maxFrameSize; i < len(headerBytes); i += maxFrameSize {
+		if len(headerBytes)-i > maxFrameSize {
+			if err := framer.WriteContinuation(1,
+				false, // endHeaders
+				headerBytes[i:maxFrameSize]); err != nil {
+				return nil, nil, err
+			}
+		} else {
+			if err := framer.WriteContinuation(1,
+				true, // endHeaders
+				headerBytes[i:]); err != nil {
+				return nil, nil, err
+			}
+		}
+	}
+
+	return h2Bytes, settings, nil
+}
+
+// getMaxFrameSize returns the SETTINGS_MAX_FRAME_SIZE. If not present default
+// value is 16384 as specified by RFC 7540 Section 6.5.2.
+func getMaxFrameSize(settings []http2.Setting) uint32 {
+	for _, setting := range settings {
+		if setting.ID == http2.SettingMaxFrameSize {
+			return setting.Val
+		}
+	}
+	return 16384
+}
+
+// getMaxHeaderTableSize returns the SETTINGS_HEADER_TABLE_SIZE. If not present
+// default value is 4096 as specified by RFC 7540 Section 6.5.2.
+func getMaxHeaderTableSize(settings []http2.Setting) uint32 {
+	for _, setting := range settings {
+		if setting.ID == http2.SettingHeaderTableSize {
+			return setting.Val
+		}
+	}
+	return 4096
+}
+
+// bufWriter is a Writer interface that also has a Flush method.
+type bufWriter interface {
+	io.Writer
+	Flush() error
+}
+
+// rwConn implements net.Conn but overrides Read and Write so that reads and
+// writes are forwarded to the provided io.Reader and bufWriter.
+type rwConn struct {
+	net.Conn
+	io.Reader
+	BufWriter bufWriter
+}
+
+// Read forwards reads to the underlying Reader.
+func (c *rwConn) Read(p []byte) (int, error) {
+	return c.Reader.Read(p)
+}
+
+// Write forwards writes to the underlying bufWriter and immediately flushes.
+func (c *rwConn) Write(p []byte) (int, error) {
+	n, err := c.BufWriter.Write(p)
+	if err := c.BufWriter.Flush(); err != nil {
+		return 0, err
+	}
+	return n, err
+}
+
+// settingsAckSwallowWriter is a writer that normally forwards bytes to it's
+// underlying Writer, but swallows the first SettingsAck frame that it sees.
+type settingsAckSwallowWriter struct {
+	Writer     *bufio.Writer
+	buf        []byte
+	didSwallow bool
+}
+
+// newSettingsAckSwallowWriter returns a new settingsAckSwallowWriter.
+func newSettingsAckSwallowWriter(w *bufio.Writer) *settingsAckSwallowWriter {
+	return &settingsAckSwallowWriter{
+		Writer:     w,
+		buf:        make([]byte, 0),
+		didSwallow: false,
+	}
+}
+
+// Write implements io.Writer interface. Normally forwards bytes to w.Writer,
+// except for the first Settings ACK frame that it sees.
+func (w *settingsAckSwallowWriter) Write(p []byte) (int, error) {
+	if !w.didSwallow {
+		w.buf = append(w.buf, p...)
+		// Process all the frames we have collected into w.buf
+		for {
+			// Append until we get full frame header which is 9 bytes
+			if len(w.buf) < 9 {
+				break
+			}
+			// Check if we have collected a whole frame.
+			fh, err := http2.ReadFrameHeader(bytes.NewBuffer(w.buf))
+			if err != nil {
+				// Corrupted frame, fail current Write
+				return 0, err
+			}
+			fSize := fh.Length + 9
+			if uint32(len(w.buf)) < fSize {
+				// Have not collected whole frame. Stop processing buf, and withhold on
+				// forward bytes to w.Writer until we get the full frame.
+				break
+			}
+
+			// We have now collected a whole frame.
+			if fh.Type == http2.FrameSettings && fh.Flags.Has(http2.FlagSettingsAck) {
+				// If Settings ACK frame, do not forward to underlying writer, remove
+				// bytes from w.buf, and record that we have swallowed Settings Ack
+				// frame.
+				w.didSwallow = true
+				w.buf = w.buf[fSize:]
+				continue
+			}
+
+			// Not settings ack frame. Forward bytes to w.Writer.
+			if _, err := w.Writer.Write(w.buf[:fSize]); err != nil {
+				// Couldn't forward bytes. Fail current Write.
+				return 0, err
+			}
+			w.buf = w.buf[fSize:]
+		}
+		return len(p), nil
+	}
+	return w.Writer.Write(p)
+}
+
+// Flush calls w.Writer.Flush.
+func (w *settingsAckSwallowWriter) Flush() error {
+	return w.Writer.Flush()
+}
+
+// isH2CUpgrade returns true if the header properly request an upgrade to h2c
+// as specified by Section 3.2.
+func isH2CUpgrade(h http.Header) bool {
+	return httplex.HeaderValuesContainsToken(h[textproto.CanonicalMIMEHeaderKey("Upgrade")], "h2c") &&
+		httplex.HeaderValuesContainsToken(h[textproto.CanonicalMIMEHeaderKey("Connection")], "HTTP2-Settings")
+}
+
+// getH2Settings returns the []http2.Setting that are encoded in the
+// HTTP2-Settings header.
+func getH2Settings(h http.Header) ([]http2.Setting, error) {
+	vals, ok := h[textproto.CanonicalMIMEHeaderKey("HTTP2-Settings")]
+	if !ok {
+		return nil, errors.New("missing HTTP2-Settings header")
+	}
+	if len(vals) != 1 {
+		return nil, fmt.Errorf("expected 1 HTTP2-Settings. Got: %v", vals)
+	}
+	settings, err := decodeSettings(vals[0])
+	if err != nil {
+		return nil, fmt.Errorf("Invalid HTTP2-Settings: %q", vals[0])
+	}
+	return settings, nil
+}
+
+// decodeSettings decodes the base64url header value of the HTTP2-Settings
+// header. RFC 7540 Section 3.2.1.
+func decodeSettings(headerVal string) ([]http2.Setting, error) {
+	b, err := base64.RawURLEncoding.DecodeString(headerVal)
+	if err != nil {
+		return nil, err
+	}
+	if len(b)%6 != 0 {
+		return nil, err
+	}
+	settings := make([]http2.Setting, 0)
+	for i := 0; i < len(b)/6; i++ {
+		settings = append(settings, http2.Setting{
+			ID:  http2.SettingID(binary.BigEndian.Uint16(b[i*6 : i*6+2])),
+			Val: binary.BigEndian.Uint32(b[i*6+2 : i*6+6]),
+		})
+	}
+
+	return settings, nil
+}
+
+// getH2HeaderBytes return the headers in r a []bytes encoded by HPACK.
+func getH2HeaderBytes(r *http.Request, maxHeaderTableSize uint32) ([]byte, error) {
+	headerBytes := bytes.NewBuffer(nil)
+	hpackEnc := hpack.NewEncoder(headerBytes)
+	hpackEnc.SetMaxDynamicTableSize(maxHeaderTableSize)
+
+	// Section 8.1.2.3
+	err := hpackEnc.WriteField(hpack.HeaderField{
+		Name:  ":method",
+		Value: r.Method,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	err = hpackEnc.WriteField(hpack.HeaderField{
+		Name:  ":scheme",
+		Value: "http",
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	err = hpackEnc.WriteField(hpack.HeaderField{
+		Name:  ":authority",
+		Value: r.Host,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	path := r.URL.Path
+	if r.URL.RawQuery != "" {
+		path = strings.Join([]string{path, r.URL.RawQuery}, "?")
+	}
+	err = hpackEnc.WriteField(hpack.HeaderField{
+		Name:  ":path",
+		Value: path,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO Implement Section 8.3
+
+	for header, values := range r.Header {
+		// Skip non h2 headers
+		if isNonH2Header(header) {
+			continue
+		}
+		for _, v := range values {
+			err := hpackEnc.WriteField(hpack.HeaderField{
+				Name:  strings.ToLower(header),
+				Value: v,
+			})
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+	return headerBytes.Bytes(), nil
+}
+
+// Connection specific headers listed in RFC 7540 Section 8.1.2.2 that are not
+// suppose to be transferred to HTTP/2. The Http2-Settings header is skipped
+// since already use to create the HTTP/2 SETTINGS frame.
+var nonH2Headers = []string{
+	"Connection",
+	"Keep-Alive",
+	"Proxy-Connection",
+	"Transfer-Encoding",
+	"Upgrade",
+	"Http2-Settings",
+}
+
+// isNonH2Header returns true if header should not be transferred to HTTP/2.
+func isNonH2Header(header string) bool {
+	for _, nonH2h := range nonH2Headers {
+		if header == nonH2h {
+			return true
+		}
+	}
+	return false
+}

integration/fixtures/grpc/config_h2c.toml

@@ -1,15 +1,10 @@
-defaultEntryPoints = ["https"]
+defaultEntryPoints = ["http"]
 
-rootCAs = [ """{{ .CertContent }}""" ]
+debug=true
 
 [entryPoints]
-  [entryPoints.https]
+  [entryPoints.http]
-  address = ":4443"
+  address = ":8081"
-    [entryPoints.https.tls]
-     [[entryPoints.https.tls.certificates]]
-     certFile = """{{ .CertContent }}"""
-     keyFile  = """{{ .KeyContent }}"""
-
 
 [api]
 

integration/fixtures/grpc/config_h2c_termination.toml

@@ -0,0 +1,25 @@
+defaultEntryPoints = ["https"]
+
+[entryPoints]
+  [entryPoints.https]
+  address = ":4443"
+    [entryPoints.https.tls]
+     [[entryPoints.https.tls.certificates]]
+     certFile = """{{ .CertContent }}"""
+     keyFile  = """{{ .KeyContent }}"""
+[api]
+
+[file]
+
+[backends]
+  [backends.backend1]
+    [backends.backend1.servers.server1]
+    url = "h2c://127.0.0.1:{{ .GRPCServerPort }}"
+    weight = 1
+
+
+[frontends]
+  [frontends.frontend1]
+  backend = "backend1"
+    [frontends.frontend1.routes.test_1]
+    rule = "Host:127.0.0.1"

integration/grpc_test.go

@@ -88,9 +88,27 @@ func getHelloClientGRPC() (helloworld.GreeterClient, func() error, error) {
 
 }
 
-func callHelloClientGRPC(name string) (string, error) {
+func getHelloClientGRPCh2c() (helloworld.GreeterClient, func() error, error) {
-	client, closer, err := getHelloClientGRPC()
+	conn, err := grpc.Dial("127.0.0.1:8081", grpc.WithInsecure())
+	if err != nil {
+		return nil, func() error { return nil }, err
+	}
+	return helloworld.NewGreeterClient(conn), conn.Close, nil
+
+}
+
+func callHelloClientGRPC(name string, secure bool) (string, error) {
+	var client helloworld.GreeterClient
+	var closer func() error
+	var err error
+
+	if secure {
+		client, closer, err = getHelloClientGRPC()
+	} else {
+		client, closer, err = getHelloClientGRPCh2c()
+	}
 	defer closer()
+
 	if err != nil {
 		return "", err
 	}
@@ -149,7 +167,7 @@ func (s *GRPCSuite) TestGRPC(c *check.C) {
 
 	var response string
 	err = try.Do(1*time.Second, func() error {
-		response, err = callHelloClientGRPC("World")
+		response, err = callHelloClientGRPC("World", true)
 		return err
 	})
 	c.Assert(err, check.IsNil)
@@ -168,6 +186,44 @@ func (s *GRPCSuite) TestGRPCh2c(c *check.C) {
 	}()
 
 	file := s.adaptFile(c, "fixtures/grpc/config_h2c.toml", struct {
+		GRPCServerPort string
+	}{
+		GRPCServerPort: port,
+	})
+
+	defer os.Remove(file)
+	cmd, display := s.traefikCmd(withConfigFile(file))
+	defer display(c)
+
+	err = cmd.Start()
+	c.Assert(err, check.IsNil)
+	defer cmd.Process.Kill()
+
+	// wait for Traefik
+	err = try.GetRequest("http://127.0.0.1:8080/api/providers", 1*time.Second, try.BodyContains("Host:127.0.0.1"))
+	c.Assert(err, check.IsNil)
+
+	var response string
+	err = try.Do(1*time.Second, func() error {
+		response, err = callHelloClientGRPC("World", false)
+		return err
+	})
+	c.Assert(err, check.IsNil)
+	c.Assert(response, check.Equals, "Hello World")
+}
+
+func (s *GRPCSuite) TestGRPCh2cTermination(c *check.C) {
+	lis, err := net.Listen("tcp", ":0")
+	_, port, err := net.SplitHostPort(lis.Addr().String())
+	c.Assert(err, check.IsNil)
+
+	go func() {
+		err := starth2cGRPCServer(lis, &myserver{})
+		c.Log(err)
+		c.Assert(err, check.IsNil)
+	}()
+
+	file := s.adaptFile(c, "fixtures/grpc/config_h2c_termination.toml", struct {
 		CertContent    string
 		KeyContent     string
 		GRPCServerPort string
@@ -191,7 +247,7 @@ func (s *GRPCSuite) TestGRPCh2c(c *check.C) {
 
 	var response string
 	err = try.Do(1*time.Second, func() error {
-		response, err = callHelloClientGRPC("World")
+		response, err = callHelloClientGRPC("World", true)
 		return err
 	})
 	c.Assert(err, check.IsNil)
@@ -233,7 +289,7 @@ func (s *GRPCSuite) TestGRPCInsecure(c *check.C) {
 
 	var response string
 	err = try.Do(1*time.Second, func() error {
-		response, err = callHelloClientGRPC("World")
+		response, err = callHelloClientGRPC("World", true)
 		return err
 	})
 	c.Assert(err, check.IsNil)

server/server.go

@@ -25,6 +25,7 @@ import (
 	"github.com/containous/traefik/cluster"
 	"github.com/containous/traefik/configuration"
 	"github.com/containous/traefik/configuration/router"
+	"github.com/containous/traefik/h2c"
 	"github.com/containous/traefik/healthcheck"
 	"github.com/containous/traefik/log"
 	"github.com/containous/traefik/metrics"
@@ -89,7 +90,7 @@ type EntryPoint struct {
 type serverEntryPoints map[string]*serverEntryPoint
 
 type serverEntryPoint struct {
-	httpServer       *http.Server
+	httpServer       *h2c.Server
 	listener         net.Listener
 	httpRouter       *middlewares.HandlerSwitcher
 	certs            *safe.Safe
@@ -747,7 +748,7 @@ func (s *Server) startServer(serverEntryPoint *serverEntryPoint) {
 	}
 }
 
-func (s *Server) prepareServer(entryPointName string, entryPoint *configuration.EntryPoint, router *middlewares.HandlerSwitcher, middlewares []negroni.Handler) (*http.Server, net.Listener, error) {
+func (s *Server) prepareServer(entryPointName string, entryPoint *configuration.EntryPoint, router *middlewares.HandlerSwitcher, middlewares []negroni.Handler) (*h2c.Server, net.Listener, error) {
 	readTimeout, writeTimeout, idleTimeout := buildServerTimeouts(s.globalConfiguration)
 	log.Infof("Preparing server %s %+v with readTimeout=%s writeTimeout=%s idleTimeout=%s", entryPointName, entryPoint, readTimeout, writeTimeout, idleTimeout)
 
@@ -792,14 +793,16 @@ func (s *Server) prepareServer(entryPointName string, entryPoint *configuration.
 		}
 	}
 
-	return &http.Server{
+	return &h2c.Server{
-			Addr:         entryPoint.Address,
+			Server: &http.Server{
-			Handler:      internalMuxRouter,
+				Addr:         entryPoint.Address,
-			TLSConfig:    tlsConfig,
+				Handler:      internalMuxRouter,
-			ReadTimeout:  readTimeout,
+				TLSConfig:    tlsConfig,
-			WriteTimeout: writeTimeout,
+				ReadTimeout:  readTimeout,
-			IdleTimeout:  idleTimeout,
+				WriteTimeout: writeTimeout,
-			ErrorLog:     httpServerLogger,
+				IdleTimeout:  idleTimeout,
+				ErrorLog:     httpServerLogger,
+			},
 		},
 		listener,
 		nil