diff --git a/integration-tests/server_tester.go b/integration-tests/server_tester.go
index 8226c899..67bbec32 100644
--- a/integration-tests/server_tester.go
+++ b/integration-tests/server_tester.go
@@ -6,10 +6,10 @@ import (
 	"crypto/tls"
 	"errors"
 	"fmt"
-	"golang.org/x/net/http2"
-	"golang.org/x/net/http2/hpack"
 	"github.com/tatsuhiro-t/go-nghttp2"
 	"github.com/tatsuhiro-t/spdy"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/hpack"
 	"golang.org/x/net/websocket"
 	"io"
 	"io/ioutil"
@@ -30,7 +30,7 @@ const (
 	serverBin  = buildDir + "/src/nghttpx"
 	serverPort = 3009
 	testDir    = sourceDir + "/integration-tests"
-	logDir	   = buildDir + "/integration-tests"
+	logDir     = buildDir + "/integration-tests"
 )
 
 func pair(name, value string) hpack.HeaderField {
@@ -86,14 +86,18 @@ func newServerTesterTLSConfig(args []string, t *testing.T, handler http.HandlerF
 
 // newServerTesterInternal creates test context.  If frontendTLS is
 // true, set up TLS frontend connection.
-func newServerTesterInternal(args []string, t *testing.T, handler http.Handler, frontendTLS bool, clientConfig *tls.Config) *serverTester {
+func newServerTesterInternal(src_args []string, t *testing.T, handler http.Handler, frontendTLS bool, clientConfig *tls.Config) *serverTester {
 	ts := httptest.NewUnstartedServer(handler)
 
+	args := []string{}
+
 	backendTLS := false
-	for _, k := range args {
+	for _, k := range src_args {
 		switch k {
 		case "--http2-bridge":
 			backendTLS = true
+		default:
+			args = append(args, k)
 		}
 	}
 	if backendTLS {
@@ -102,9 +106,9 @@ func newServerTesterInternal(args []string, t *testing.T, handler http.Handler,
 		// NextProtos separately for ts.TLS.  NextProtos set
 		// in nghttp2.ConfigureServer is effectively ignored.
 		ts.TLS = new(tls.Config)
-		ts.TLS.NextProtos = append(ts.TLS.NextProtos, "h2-14")
+		ts.TLS.NextProtos = append(ts.TLS.NextProtos, "h2")
 		ts.StartTLS()
-		args = append(args, "-k")
+		args = append(args, "-k", "--backend-tls")
 	} else {
 		ts.Start()
 	}
@@ -124,6 +128,9 @@ func newServerTesterInternal(args []string, t *testing.T, handler http.Handler,
 	// URL.Host looks like "127.0.0.1:8080", but we want
 	// "127.0.0.1,8080"
 	b := "-b" + strings.Replace(backendURL.Host, ":", ",", -1)
+	if backendTLS {
+		b += ";;proto=h2"
+	}
 	args = append(args, fmt.Sprintf("-f127.0.0.1,%v", serverPort), b,
 		"--errorlog-file="+logDir+"/log.txt", "-LINFO")