diff --git a/conn.go b/conn.go
index fdfb935..eb7e754 100644
--- a/conn.go
+++ b/conn.go
@@ -25,13 +25,15 @@ var (
 
 // ClientConn http2 client connection
 type ClientConn struct {
-	session *C.nghttp2_session
-	conn    net.Conn
-	streams map[int]*ClientStream
-	lock    *sync.Mutex
-	errch   chan struct{}
-	exitch  chan struct{}
-	err     error
+	session     *C.nghttp2_session
+	conn        net.Conn
+	streams     map[int]*ClientStream
+	lock        *sync.Mutex
+	errch       chan struct{}
+	exitch      chan struct{}
+	err         error
+	closed      bool
+	streamCount int
 }
 
 // Client create http2 client
@@ -57,8 +59,22 @@ func Client(c net.Conn) (*ClientConn, error) {
 	return conn, nil
 }
 
+// Error return current error on connection
+func (c *ClientConn) Error() error {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	return c.err
+}
+
 // Close close the http2 connection
 func (c *ClientConn) Close() error {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	if c.closed {
+		return nil
+	}
+	//log.Println("close client connection")
+	c.closed = true
 	for _, s := range c.streams {
 		s.Close()
 	}
@@ -70,17 +86,17 @@ func (c *ClientConn) Close() error {
 }
 
 func (c *ClientConn) run() {
-	var wantRead int
 	var wantWrite int
 	var delay = 50 * time.Millisecond
 	var keepalive = 5 * time.Second
 	var ret C.int
 	var lastDataRecv time.Time
 
+	//defer c.Close()
+
 	defer close(c.errch)
 
-	datach := make(chan []byte)
-	errch := make(chan error)
+	errch := make(chan struct{}, 5)
 
 	// data read loop
 	go func() {
@@ -90,16 +106,35 @@ func (c *ClientConn) run() {
 			select {
 			case <-c.exitch:
 				break readloop
+			case <-errch:
+				break readloop
 			default:
 			}
 
 			n, err := c.conn.Read(buf)
 			if err != nil {
-				errch <- err
+				c.lock.Lock()
+				c.err = err
+				c.lock.Unlock()
+				errch <- struct{}{}
 				break
 			}
-			datach <- buf[:n]
+			//log.Printf("read %d bytes from network", n)
 			lastDataRecv = time.Now()
+			d1 := C.CBytes(buf[:n])
+
+			c.lock.Lock()
+			ret1 := C.nghttp2_session_mem_recv(c.session,
+				(*C.uchar)(d1), C.size_t(n))
+			c.lock.Unlock()
+
+			C.free(d1)
+			if int(ret1) < 0 {
+				c.err = fmt.Errorf("sesion recv error: %s",
+					C.GoString(C.nghttp2_strerror(ret)))
+				//log.Println(c.err)
+				break
+			}
 		}
 	}()
 
@@ -109,13 +144,18 @@ func (c *ClientConn) run() {
 			select {
 			case <-c.exitch:
 				return
+			case <-errch:
+				return
 			case <-time.After(keepalive):
 			}
 			now := time.Now()
 			last := lastDataRecv
 			d := now.Sub(last)
 			if d > keepalive {
+				c.lock.Lock()
 				C.nghttp2_submit_ping(c.session, 0, nil)
+				c.lock.Unlock()
+				//log.Println("submit ping")
 			}
 		}
 	}()
@@ -125,47 +165,99 @@ loop:
 		select {
 		case <-c.errch:
 			break loop
-		case err := <-errch:
-			c.err = err
+		case <-errch:
 			break loop
 		case <-c.exitch:
 			break loop
 		default:
 		}
 
-		wantWrite = int(C.nghttp2_session_want_write(c.session))
-		if wantWrite != 0 {
-			ret = C.nghttp2_session_send(c.session)
-			if int(ret) < 0 {
-				c.err = fmt.Errorf("sesion send error: %s",
-					C.GoString(C.nghttp2_strerror(ret)))
-				//log.Println(c.err)
-				break
-			}
+		c.lock.Lock()
+		ret = C.nghttp2_session_send(c.session)
+		c.lock.Unlock()
+
+		if int(ret) < 0 {
+			c.lock.Lock()
+			c.err = fmt.Errorf("sesion send error: %s",
+				C.GoString(C.nghttp2_strerror(ret)))
+			c.lock.Unlock()
+			//log.Println(c.err)
+			errch <- struct{}{}
+			break
 		}
 
-		wantRead = int(C.nghttp2_session_want_read(c.session))
-		select {
-		case d := <-datach:
-			d1 := C.CBytes(d)
-			ret1 := C.nghttp2_session_mem_recv(c.session,
-				(*C.uchar)(d1), C.size_t(int(len(d))))
-			C.free(d1)
-			if int(ret1) < 0 {
-				c.err = fmt.Errorf("sesion recv error: %s",
-					C.GoString(C.nghttp2_strerror(ret)))
-				//log.Println(c.err)
-				break loop
-			}
-		default:
-		}
+		c.lock.Lock()
+		wantWrite = int(C.nghttp2_session_want_write(c.session))
+		c.lock.Unlock()
 
 		// make delay when no data read/write
-		if wantRead == 0 && wantWrite == 0 {
-			select {
-			case <-time.After(delay):
-			}
+		if wantWrite == 0 {
+			time.Sleep(delay)
+		}
+	}
+}
+
+// Connect submit a CONNECT request
+func (c *ClientConn) Connect(req *http.Request) (*ClientStream, error) {
+	if c.err != nil {
+		return nil, c.err
+	}
+	nvIndex := 0
+	nvMax := 5
+	nva := C.new_nv_array(C.size_t(nvMax))
+	//log.Printf("%s %s", req.Method, req.RequestURI)
+	setNvArray(nva, nvIndex, ":method", req.Method, 0)
+	nvIndex++
+	//setNvArray(nva, nvIndex, ":scheme", "https", 0)
+	//nvIndex++
+	//log.Printf("header authority: %s", req.RequestURI)
+	setNvArray(nva, nvIndex, ":authority", req.RequestURI, 0)
+	nvIndex++
+	var dp *dataProvider
+	var cdp *C.nghttp2_data_provider
+	dp, cdp = newDataProvider(c.lock)
+
+	c.lock.Lock()
+	streamID := C.submit_request(c.session, nva.nv, C.size_t(nvIndex), cdp)
+	c.lock.Unlock()
+
+	C.delete_nv_array(nva)
+	if int(streamID) < 0 {
+		return nil, fmt.Errorf("submit request error: %s",
+			C.GoString(C.nghttp2_strerror(streamID)))
+	}
+	if dp != nil {
+		dp.streamID = int(streamID)
+		dp.session = c.session
+	}
+	//log.Println("stream id ", int(streamID))
+	s := &ClientStream{
+		streamID: int(streamID),
+		conn:     c,
+		dp:       dp,
+		cdp:      cdp,
+		resch:    make(chan *http.Response),
+		errch:    make(chan error),
+		lock:     new(sync.Mutex),
+	}
+	c.lock.Lock()
+	c.streams[int(streamID)] = s
+	c.streamCount++
+	c.lock.Unlock()
+	//log.Printf("new stream id %d", int(streamID))
+	select {
+	case err := <-s.errch:
+		//log.Println("wait response, got ", err)
+		return nil, err
+	case res := <-s.resch:
+		if res != nil {
+			res.Request = req
+			return s, nil
 		}
+		//log.Println("wait response, empty response")
+		return nil, io.EOF
+	case <-c.errch:
+		return nil, fmt.Errorf("connection error")
 	}
 }
 
@@ -180,8 +272,10 @@ func (c *ClientConn) CreateRequest(req *http.Request) (*http.Response, error) {
 	nva := C.new_nv_array(C.size_t(nvMax))
 	setNvArray(nva, nvIndex, ":method", req.Method, 0)
 	nvIndex++
-	setNvArray(nva, nvIndex, ":scheme", "https", 0)
-	nvIndex++
+	if req.Method != "CONNECT" {
+		setNvArray(nva, nvIndex, ":scheme", "https", 0)
+		nvIndex++
+	}
 	setNvArray(nva, nvIndex, ":authority", req.Host, 0)
 	nvIndex++
 
@@ -190,10 +284,15 @@ func (c *ClientConn) CreateRequest(req *http.Request) (*http.Response, error) {
 	if q != "" {
 		p = p + "?" + q
 	}
-	setNvArray(nva, nvIndex, ":path", p, 0)
-	nvIndex++
+	if req.Method != "CONNECT" {
+		setNvArray(nva, nvIndex, ":path", p, 0)
+		nvIndex++
+	}
+	//log.Printf("%s http://%s%s", req.Method, req.Host, p)
 	for k, v := range req.Header {
-		if strings.ToLower(k) == "host" {
+		//log.Printf("header %s: %s\n", k, v[0])
+		_k := strings.ToLower(k)
+		if _k == "host" || _k == "connection" || _k == "proxy-connection" {
 			continue
 		}
 		//log.Printf("header %s: %s", k, v)
@@ -202,41 +301,53 @@ func (c *ClientConn) CreateRequest(req *http.Request) (*http.Response, error) {
 	}
 	var dp *dataProvider
 	var cdp *C.nghttp2_data_provider
-	if req.Body != nil {
-		dp, cdp = newDataProvider()
+	if req.Method == "PUT" || req.Method == "POST" || req.Method == "CONNECT" {
+		dp, cdp = newDataProvider(c.lock)
 		go func() {
 			io.Copy(dp, req.Body)
 			dp.Close()
 		}()
 	}
+
+	c.lock.Lock()
 	streamID := C.submit_request(c.session, nva.nv, C.size_t(nvIndex), cdp)
-	if dp != nil {
-		dp.streamID = int(streamID)
-		dp.session = c.session
-	}
+	c.lock.Unlock()
+
 	C.delete_nv_array(nva)
 	if int(streamID) < 0 {
 		return nil, fmt.Errorf("submit request error: %s",
 			C.GoString(C.nghttp2_strerror(streamID)))
 	}
-	//log.Println("stream id ", int(streamID))
+
+	//log.Printf("new stream, id %d", int(streamID))
+
+	if dp != nil {
+		dp.streamID = int(streamID)
+		dp.session = c.session
+	}
 	s := &ClientStream{
 		streamID: int(streamID),
+		conn:     c,
 		dp:       dp,
 		cdp:      cdp,
 		resch:    make(chan *http.Response),
 		errch:    make(chan error),
+		lock:     new(sync.Mutex),
 	}
 	c.lock.Lock()
 	c.streams[int(streamID)] = s
+	c.streamCount++
 	c.lock.Unlock()
 
 	select {
 	case err := <-s.errch:
 		return nil, err
 	case res := <-s.resch:
-		res.Request = req
-		return res, nil
+		if res != nil {
+			res.Request = req
+			return res, nil
+		}
+		return nil, io.EOF
 	case <-c.errch:
 		return nil, fmt.Errorf("connection error")
 	}
@@ -336,17 +447,14 @@ func (c *ServerConn) Close() error {
 
 // Run run the server loop
 func (c *ServerConn) Run() {
-	var wantRead int
 	var wantWrite int
 	var delay = 100 * time.Millisecond
 	var ret C.int
-	var shouldDelay bool
 
 	defer c.Close()
 	defer close(c.errch)
 
-	datach := make(chan []byte)
-	errch := make(chan error)
+	errch := make(chan struct{}, 5)
 
 	go func() {
 		buf := make([]byte, 16*1024)
@@ -355,15 +463,37 @@ func (c *ServerConn) Run() {
 			select {
 			case <-c.exitch:
 				break readloop
+			case <-errch:
+				break readloop
 			default:
 			}
 
 			n, err := c.conn.Read(buf)
 			if err != nil {
-				errch <- err
+				c.lock.Lock()
+				c.err = err
+				c.lock.Unlock()
+				errch <- struct{}{}
+				break
+			}
+
+			d1 := C.CBytes(buf[:n])
+
+			c.lock.Lock()
+			ret1 := C.nghttp2_session_mem_recv(c.session,
+				(*C.uchar)(d1), C.size_t(n))
+			c.lock.Unlock()
+
+			C.free(d1)
+			if int(ret1) < 0 {
+				c.lock.Lock()
+				c.err = fmt.Errorf("sesion recv error: %s",
+					C.GoString(C.nghttp2_strerror(ret)))
+				c.lock.Unlock()
+				//log.Println(c.err)
+				errch <- struct{}{}
 				break
 			}
-			datach <- buf[:n]
 		}
 	}()
 
@@ -372,50 +502,33 @@ loop:
 		select {
 		case <-c.errch:
 			break loop
-		case err := <-errch:
-			c.err = err
+		case <-errch:
 			break loop
 		case <-c.exitch:
 			break loop
 		default:
 		}
 
-		wantWrite = int(C.nghttp2_session_want_write(c.session))
-		if wantWrite != 0 {
-			ret = C.nghttp2_session_send(c.session)
-			if int(ret) < 0 {
-				c.err = fmt.Errorf("sesion send error: %s",
-					C.GoString(C.nghttp2_strerror(ret)))
-				//log.Println(c.err)
-				break
-			}
-		}
-
-		wantRead = int(C.nghttp2_session_want_read(c.session))
-		select {
-		case d := <-datach:
-			d1 := C.CBytes(d)
-			ret1 := C.nghttp2_session_mem_recv(c.session,
-				(*C.uchar)(d1), C.size_t(int(len(d))))
-			C.free(d1)
-			if int(ret1) < 0 {
-				c.err = fmt.Errorf("sesion recv error: %s",
-					C.GoString(C.nghttp2_strerror(ret)))
-				//log.Println(c.err)
-				break loop
-			}
-			shouldDelay = false
-		default:
-			// want read but data not avaliable
-			if wantRead != 0 {
-				shouldDelay = true
-			}
+		c.lock.Lock()
+		ret = C.nghttp2_session_send(c.session)
+		c.lock.Unlock()
+
+		if int(ret) < 0 {
+			c.lock.Lock()
+			c.err = fmt.Errorf("sesion send error: %s",
+				C.GoString(C.nghttp2_strerror(ret)))
+			c.lock.Unlock()
+			//log.Println(c.err)
+			errch <- struct{}{}
+			break
 		}
 
+		c.lock.Lock()
 		wantWrite = int(C.nghttp2_session_want_write(c.session))
+		c.lock.Unlock()
 
 		// make delay when no data read/write
-		if (shouldDelay || wantRead == 0) && wantWrite == 0 {
+		if wantWrite == 0 {
 			time.Sleep(delay)
 		}
 	}
diff --git a/data_provider.go b/data_provider.go
index 6ded9b7..3e053c7 100644
--- a/data_provider.go
+++ b/data_provider.go
@@ -6,6 +6,7 @@ package nghttp2
 import "C"
 import (
 	"bytes"
+	"io"
 	"sync"
 	"time"
 	"unsafe"
@@ -19,8 +20,10 @@ type dataProvider struct {
 	buf      *bytes.Buffer
 	closed   bool
 	lock     *sync.Mutex
+	sessLock *sync.Mutex
 	session  *C.nghttp2_session
 	streamID int
+	deferred bool
 }
 
 // Read read from data provider
@@ -39,7 +42,15 @@ func (dp *dataProvider) Read(buf []byte) (n int, err error) {
 func (dp *dataProvider) Write(buf []byte) (n int, err error) {
 	dp.lock.Lock()
 	defer dp.lock.Unlock()
-	C.nghttp2_session_resume_data(dp.session, C.int(dp.streamID))
+	if dp.closed {
+		return 0, io.EOF
+	}
+	if dp.deferred {
+		dp.sessLock.Lock()
+		C.nghttp2_session_resume_data(dp.session, C.int(dp.streamID))
+		dp.sessLock.Unlock()
+		dp.deferred = false
+	}
 	return dp.buf.Write(buf)
 }
 
@@ -47,16 +58,26 @@ func (dp *dataProvider) Write(buf []byte) (n int, err error) {
 func (dp *dataProvider) Close() error {
 	dp.lock.Lock()
 	defer dp.lock.Unlock()
+	if dp.closed {
+		return nil
+	}
 	dp.closed = true
-	C.nghttp2_session_resume_data(dp.session, C.int(dp.streamID))
+	//log.Printf("dp close stream %d", dp.streamID)
+	if dp.deferred {
+		dp.sessLock.Lock()
+		C.nghttp2_session_resume_data(dp.session, C.int(dp.streamID))
+		dp.sessLock.Unlock()
+		dp.deferred = false
+	}
 	return nil
 }
 
-func newDataProvider() (
+func newDataProvider(sessionLock *sync.Mutex) (
 	*dataProvider, *C.nghttp2_data_provider) {
 	dp := &dataProvider{
-		buf:  new(bytes.Buffer),
-		lock: new(sync.Mutex),
+		buf:      new(bytes.Buffer),
+		lock:     new(sync.Mutex),
+		sessLock: sessionLock,
 	}
 	cdp := C.new_data_provider(C.size_t(uintptr(unsafe.Pointer(dp))))
 	return dp, cdp
diff --git a/stream.go b/stream.go
index f28fa18..235316a 100644
--- a/stream.go
+++ b/stream.go
@@ -9,11 +9,14 @@ import (
 	"io"
 	"net/http"
 	"strings"
+	"sync"
+	"unsafe"
 )
 
 // ClientStream http2 client stream
 type ClientStream struct {
 	streamID int
+	conn     *ClientConn
 	cdp      *C.nghttp2_data_provider
 	dp       *dataProvider
 	// application read data from stream
@@ -24,15 +27,27 @@ type ClientStream struct {
 	resch  chan *http.Response
 	errch  chan error
 	closed bool
+	lock   *sync.Mutex
+}
+
+// Response return response of the current stream
+func (s *ClientStream) Response() *http.Response {
+	return s.res
 }
 
 // Read read stream data
 func (s *ClientStream) Read(buf []byte) (n int, err error) {
+	if s.closed || s.res == nil || s.res.Body == nil {
+		return 0, io.EOF
+	}
 	return s.res.Body.Read(buf)
 }
 
 // Write write data to stream
 func (s *ClientStream) Write(buf []byte) (n int, err error) {
+	if s.closed {
+		return 0, io.EOF
+	}
 	if s.dp != nil {
 		return s.dp.Write(buf)
 	}
@@ -41,26 +56,44 @@ func (s *ClientStream) Write(buf []byte) (n int, err error) {
 
 // Close close the stream
 func (s *ClientStream) Close() error {
+	//s.lock.Lock()
+	//defer s.lock.Unlock()
 	if s.closed {
 		return nil
 	}
+	s.closed = true
 	err := io.EOF
-	//log.Println("close stream")
+	//log.Printf("close stream %d", int(s.streamID))
 	select {
 	case s.errch <- err:
 	default:
 	}
 	//log.Println("close stream resch")
-	close(s.resch)
+	//close(s.resch)
 	//log.Println("close stream errch")
-	close(s.errch)
+	//close(s.errch)
 	//log.Println("close pipe w")
-	s.res.Body.Close()
+	if s.res != nil && s.res.Body != nil {
+		s.res.Body.Close()
+	}
 	//log.Println("close stream done")
 	if s.dp != nil {
 		s.dp.Close()
+		//s.conn.lock.Lock()
+		//C.nghttp2_submit_rst_stream(s.conn.session, 0, C.int(s.streamID), 0)
+		//s.conn.lock.Unlock()
+		s.dp = nil
 	}
-	s.closed = true
+	if s.cdp != nil {
+		C.free(unsafe.Pointer(s.cdp))
+		s.cdp = nil
+	}
+
+	//s.conn.lock.Lock()
+	//defer s.conn.lock.Unlock()
+	//if _, ok := s.conn.streams[s.streamID]; ok {
+	//delete(s.conn.streams, s.streamID)
+	//}
 	return nil
 }
 
@@ -94,27 +127,26 @@ type ServerStream struct {
 // Write write data to stream,
 // implements http.ResponseWriter
 func (s *ServerStream) Write(buf []byte) (int, error) {
+	if s.closed {
+		return 0, io.EOF
+	}
+
 	if !s.responseSend {
 		s.WriteHeader(http.StatusOK)
 	}
-	/*
-		//log.Printf("stream %d, send %d bytes", s.streamID, len(buf))
-		if s.buf.Len() > 2048 {
-			s.dp.Write(s.buf.Bytes())
-			s.buf.Reset()
-		}
-
-		if len(buf) < 2048 {
-			s.buf.Write(buf)
-			return len(buf), nil
-		}
-	*/
 	return s.dp.Write(buf)
 }
 
 // WriteHeader set response code and send reponse,
 // implements http.ResponseWriter
 func (s *ServerStream) WriteHeader(code int) {
+	if s.closed {
+		return
+	}
+	if s.responseSend {
+		return
+	}
+	s.responseSend = true
 	s.statusCode = code
 	nvIndex := 0
 	nvMax := 25
@@ -132,18 +164,21 @@ func (s *ServerStream) WriteHeader(code int) {
 	}
 	var dp *dataProvider
 	var cdp *C.nghttp2_data_provider
-	dp, cdp = newDataProvider()
+	dp, cdp = newDataProvider(s.conn.lock)
 	dp.streamID = s.streamID
 	dp.session = s.conn.session
 	s.dp = dp
 	s.cdp = cdp
+
+	s.conn.lock.Lock()
 	ret := C.nghttp2_submit_response(
 		s.conn.session, C.int(s.streamID), nva.nv, C.size_t(nvIndex), cdp)
+	s.conn.lock.Unlock()
+
 	C.delete_nv_array(nva)
 	if int(ret) < 0 {
 		panic(fmt.Sprintf("sumit response error %s", C.GoString(C.nghttp2_strerror(ret))))
 	}
-	s.responseSend = true
 	//log.Printf("stream %d send response", s.streamID)
 }
 
@@ -161,14 +196,19 @@ func (s *ServerStream) Close() error {
 	if s.closed {
 		return nil
 	}
+	s.closed = true
 	//C.nghttp2_submit_rst_stream(s.conn.session, 0, C.int(s.streamID), 0)
 	if s.req.Body != nil {
 		s.req.Body.Close()
 	}
 	if s.dp != nil {
 		s.dp.Close()
+		s.dp = nil
+	}
+	if s.cdp != nil {
+		C.free(unsafe.Pointer(s.cdp))
+		s.cdp = nil
 	}
-	s.closed = true
 	//log.Printf("stream %d closed", s.streamID)
 	return nil
 }