diff --git a/_nghttp2.h b/_nghttp2.h
index 436fcb4..d585e11 100644
--- a/_nghttp2.h
+++ b/_nghttp2.h
@@ -9,7 +9,8 @@
 
 extern ssize_t onClientDataRecvCallback(void *, void *data, size_t);
 extern ssize_t onClientDataSendCallback(void *, void *data, size_t);
-extern ssize_t onDataSourceReadCallback(void *, void *, size_t);
+extern ssize_t onServerDataSourceReadCallback(void *, int, void *, size_t);
+extern ssize_t onClientDataSourceReadCallback(void *, int, void *, size_t);
 extern int onClientDataChunkRecv(void *, int, void *, size_t);
 extern int onClientBeginHeaderCallback(void *, int);
 extern int onClientHeaderCallback(void *, int, void *, int, void *, int);
@@ -17,6 +18,13 @@ extern int onClientHeadersDoneCallback(void *, int);
 extern int onClientStreamClose(void *, int);
 extern void onClientConnectionCloseCallback(void *user_data);
 
+int _nghttp2_submit_response(nghttp2_session *sess, int streamid,
+                             size_t nv, size_t nvlen, nghttp2_data_provider *dp);
+
+int _nghttp2_submit_request(nghttp2_session *session, const nghttp2_priority_spec *pri_spec,
+                            size_t nva, size_t nvlen,
+                            const nghttp2_data_provider *data_prd, void *stream_user_data);
+
 extern ssize_t onServerDataRecvCallback(void *, void *data, size_t);
 extern ssize_t onServerDataSendCallback(void *, void *data, size_t);
 extern int onServerDataChunkRecv(void *, int, void *, size_t);
@@ -34,7 +42,7 @@ struct nv_array
 };
 
 void delete_nv_array(struct nv_array *a);
-nghttp2_data_provider *new_data_provider(size_t data);
+int data_provider_set_callback(size_t dp, size_t data, int t);
 
 int nv_array_set(struct nv_array *a, int index,
                  char *name, char *value,
diff --git a/callbacks.go b/callbacks.go
index 04d657f..a1d7f6a 100644
--- a/callbacks.go
+++ b/callbacks.go
@@ -23,26 +23,6 @@ const (
 	NGHTTP2_ERR_DEFERRED                  = -508
 )
 
-/*
-// onServerDataRecvCallback callback function for libnghttp2 library
-// want receive data from network.
-//
-//export onServerDataRecvCallback
-func onServerDataRecvCallback(ptr unsafe.Pointer, data unsafe.Pointer,
-	length C.size_t) C.ssize_t {
-	conn := (*ServerConn)(ptr)
-	buf := make([]byte, int(length))
-	n, err := conn.conn.Read(buf)
-	if err != nil {
-		return -1
-	}
-	cbuf := C.CBytes(buf[:n])
-	defer C.free(cbuf)
-	C.memcpy(data, cbuf, C.size_t(n))
-	return C.ssize_t(n)
-}
-*/
-
 // onServerDataSendCallback callback function for libnghttp2 library
 // want send data to network.
 //
@@ -50,7 +30,7 @@ func onServerDataRecvCallback(ptr unsafe.Pointer, data unsafe.Pointer,
 func onServerDataSendCallback(ptr unsafe.Pointer, data unsafe.Pointer,
 	length C.size_t) C.ssize_t {
 	//log.Println("server data send")
-	conn := (*ServerConn)(ptr)
+	conn := (*ServerConn)(unsafe.Pointer(uintptr(ptr)))
 	buf := C.GoBytes(data, C.int(length))
 	n, err := conn.conn.Write(buf)
 	if err != nil {
@@ -65,7 +45,7 @@ func onServerDataSendCallback(ptr unsafe.Pointer, data unsafe.Pointer,
 //export onServerDataChunkRecv
 func onServerDataChunkRecv(ptr unsafe.Pointer, streamID C.int,
 	data unsafe.Pointer, length C.size_t) C.int {
-	conn := (*ServerConn)(ptr)
+	conn := (*ServerConn)(unsafe.Pointer(uintptr(ptr)))
 	s, ok := conn.streams[int(streamID)]
 	if !ok {
 		return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE
@@ -80,7 +60,7 @@ func onServerDataChunkRecv(ptr unsafe.Pointer, streamID C.int,
 //
 //export onServerBeginHeaderCallback
 func onServerBeginHeaderCallback(ptr unsafe.Pointer, streamID C.int) C.int {
-	conn := (*ServerConn)(ptr)
+	conn := (*ServerConn)(unsafe.Pointer(uintptr(ptr)))
 	var TLS tls.ConnectionState
 	if tlsconn, ok := conn.conn.(*tls.Conn); ok {
 		TLS = tlsconn.ConnectionState()
@@ -113,7 +93,7 @@ func onServerBeginHeaderCallback(ptr unsafe.Pointer, streamID C.int) C.int {
 func onServerHeaderCallback(ptr unsafe.Pointer, streamID C.int,
 	name unsafe.Pointer, namelen C.int,
 	value unsafe.Pointer, valuelen C.int) C.int {
-	conn := (*ServerConn)(ptr)
+	conn := (*ServerConn)(unsafe.Pointer(uintptr(ptr)))
 	s, ok := conn.streams[int(streamID)]
 	if !ok {
 		return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE
@@ -149,7 +129,7 @@ func onServerHeaderCallback(ptr unsafe.Pointer, streamID C.int,
 //export onServerStreamEndCallback
 func onServerStreamEndCallback(ptr unsafe.Pointer, streamID C.int) C.int {
 
-	conn := (*ServerConn)(ptr)
+	conn := (*ServerConn)(unsafe.Pointer(uintptr(ptr)))
 	s, ok := conn.streams[int(streamID)]
 	if !ok {
 		return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE
@@ -169,7 +149,7 @@ func onServerStreamEndCallback(ptr unsafe.Pointer, streamID C.int) C.int {
 //
 //export onServerHeadersDoneCallback
 func onServerHeadersDoneCallback(ptr unsafe.Pointer, streamID C.int) C.int {
-	conn := (*ServerConn)(ptr)
+	conn := (*ServerConn)(unsafe.Pointer(uintptr(ptr)))
 	s, ok := conn.streams[int(streamID)]
 	if !ok {
 		return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE
@@ -190,8 +170,9 @@ func onServerHeadersDoneCallback(ptr unsafe.Pointer, streamID C.int) C.int {
 //
 //export onServerStreamClose
 func onServerStreamClose(ptr unsafe.Pointer, streamID C.int) C.int {
-	conn := (*ServerConn)(ptr)
+	conn := (*ServerConn)(unsafe.Pointer(uintptr(ptr)))
 	s, ok := conn.streams[int(streamID)]
+	//log.Printf("stream %d closed", int(streamID))
 	if !ok {
 		return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE
 	}
@@ -202,18 +183,61 @@ func onServerStreamClose(ptr unsafe.Pointer, streamID C.int) C.int {
 	return NGHTTP2_NO_ERROR
 }
 
-// onDataSourceReadCallback callback function for libnghttp2 library
+// onClientDataSourceReadCallback callback function for libnghttp2 library
+// want read data from data provider source,
+// return NGHTTP2_ERR_DEFERRED will cause data frame defered,
+// application later call nghttp2_session_resume_data will re-quene the data frame
+//
+//export onClientDataSourceReadCallback
+func onClientDataSourceReadCallback(ptr unsafe.Pointer, streamID C.int,
+	buf unsafe.Pointer, length C.size_t) C.ssize_t {
+	//log.Println("onDataSourceReadCallback begin")
+	conn := (*ClientConn)(unsafe.Pointer(uintptr(ptr)))
+	s, ok := conn.streams[int(streamID)]
+	if !ok {
+		//log.Println("client dp callback, stream not exists")
+		return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE
+	}
+	gobuf := make([]byte, int(length))
+	n, err := s.dp.Read(gobuf)
+	if err != nil {
+		if err == io.EOF {
+			//log.Println("onDataSourceReadCallback end")
+			return 0
+		}
+		if err == errAgain {
+			//log.Println("onDataSourceReadCallback end")
+			s.dp.deferred = true
+			return NGHTTP2_ERR_DEFERRED
+		}
+		//log.Println("onDataSourceReadCallback end")
+		return NGHTTP2_ERR_CALLBACK_FAILURE
+	}
+	//cbuf := C.CBytes(gobuf)
+	//defer C.free(cbuf)
+	//C.memcpy(buf, cbuf, C.size_t(n))
+	C.memcpy(buf, unsafe.Pointer(&gobuf[0]), C.size_t(n))
+	//log.Println("onDataSourceReadCallback end")
+	return C.ssize_t(n)
+}
+
+// onServerDataSourceReadCallback callback function for libnghttp2 library
 // want read data from data provider source,
 // return NGHTTP2_ERR_DEFERRED will cause data frame defered,
 // application later call nghttp2_session_resume_data will re-quene the data frame
 //
-//export onDataSourceReadCallback
-func onDataSourceReadCallback(ptr unsafe.Pointer,
+//export onServerDataSourceReadCallback
+func onServerDataSourceReadCallback(ptr unsafe.Pointer, streamID C.int,
 	buf unsafe.Pointer, length C.size_t) C.ssize_t {
 	//log.Println("onDataSourceReadCallback begin")
-	dp := (*dataProvider)(ptr)
+	conn := (*ServerConn)(unsafe.Pointer(uintptr(ptr)))
+	s, ok := conn.streams[int(streamID)]
+	if !ok {
+		//log.Println("server dp callback, stream not exists")
+		return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE
+	}
 	gobuf := make([]byte, int(length))
-	n, err := dp.Read(gobuf)
+	n, err := s.dp.Read(gobuf)
 	if err != nil {
 		if err == io.EOF {
 			//log.Println("onDataSourceReadCallback end")
@@ -221,15 +245,16 @@ func onDataSourceReadCallback(ptr unsafe.Pointer,
 		}
 		if err == errAgain {
 			//log.Println("onDataSourceReadCallback end")
-			dp.deferred = true
+			s.dp.deferred = true
 			return NGHTTP2_ERR_DEFERRED
 		}
 		//log.Println("onDataSourceReadCallback end")
 		return NGHTTP2_ERR_CALLBACK_FAILURE
 	}
-	cbuf := C.CBytes(gobuf)
-	defer C.free(cbuf)
-	C.memcpy(buf, cbuf, C.size_t(n))
+	//cbuf := C.CBytes(gobuf)
+	//defer C.free(cbuf)
+	//C.memcpy(buf, cbuf, C.size_t(n))
+	C.memcpy(buf, unsafe.Pointer(&gobuf[0]), C.size_t(n))
 	//log.Println("onDataSourceReadCallback end")
 	return C.ssize_t(n)
 }
@@ -240,7 +265,7 @@ func onDataSourceReadCallback(ptr unsafe.Pointer,
 func onClientDataChunkRecv(ptr unsafe.Pointer, streamID C.int,
 	buf unsafe.Pointer, length C.size_t) C.int {
 	//log.Println("onClientDataChunkRecv begin")
-	conn := (*ClientConn)(ptr)
+	conn := (*ClientConn)(unsafe.Pointer(uintptr(ptr)))
 	gobuf := C.GoBytes(buf, C.int(length))
 
 	s, ok := conn.streams[int(streamID)]
@@ -266,34 +291,13 @@ func onClientDataChunkRecv(ptr unsafe.Pointer, streamID C.int,
 	return C.int(length)
 }
 
-/*
-// onClientDataRecvCallback callback function for libnghttp2 library want read data from network.
-//
-//export onClientDataRecvCallback
-func onClientDataRecvCallback(ptr unsafe.Pointer, data unsafe.Pointer, size C.size_t) C.ssize_t {
-	//log.Println("data read req", int(size))
-	conn := (*ClientConn)(ptr)
-	buf := make([]byte, int(size))
-	//log.Println(conn.conn.RemoteAddr())
-	n, err := conn.conn.Read(buf)
-	if err != nil {
-		//log.Println(err)
-		return -1
-	}
-	cbuf := C.CBytes(buf)
-	//log.Println("read from network ", n, buf[:n])
-	C.memcpy(data, cbuf, C.size_t(n))
-	return C.ssize_t(n)
-}
-*/
-
 // onClientDataSendCallback callback function for libnghttp2 library want send data to network.
 //
 //export onClientDataSendCallback
 func onClientDataSendCallback(ptr unsafe.Pointer, data unsafe.Pointer, size C.size_t) C.ssize_t {
 	//log.Println("onClientDataSendCallback begin")
 	//log.Println("data write req ", int(size))
-	conn := (*ClientConn)(ptr)
+	conn := (*ClientConn)(unsafe.Pointer(uintptr(ptr)))
 	buf := C.GoBytes(data, C.int(size))
 	//log.Println(conn.conn.RemoteAddr())
 	n, err := conn.conn.Write(buf)
@@ -312,7 +316,7 @@ func onClientDataSendCallback(ptr unsafe.Pointer, data unsafe.Pointer, size C.si
 func onClientBeginHeaderCallback(ptr unsafe.Pointer, streamID C.int) C.int {
 	//log.Println("onClientBeginHeaderCallback begin")
 	//log.Printf("stream %d begin headers", int(streamID))
-	conn := (*ClientConn)(ptr)
+	conn := (*ClientConn)(unsafe.Pointer(uintptr(ptr)))
 
 	s, ok := conn.streams[int(streamID)]
 	if !ok {
@@ -343,7 +347,7 @@ func onClientHeaderCallback(ptr unsafe.Pointer, streamID C.int,
 	value unsafe.Pointer, valuelen C.int) C.int {
 	//log.Println("onClientHeaderCallback begin")
 	//log.Println("header")
-	conn := (*ClientConn)(ptr)
+	conn := (*ClientConn)(unsafe.Pointer(uintptr(ptr)))
 	goname := string(C.GoBytes(name, namelen))
 	govalue := string(C.GoBytes(value, valuelen))
 
@@ -383,7 +387,7 @@ func onClientHeaderCallback(ptr unsafe.Pointer, streamID C.int,
 func onClientHeadersDoneCallback(ptr unsafe.Pointer, streamID C.int) C.int {
 	//log.Println("onClientHeadersDoneCallback begin")
 	//log.Printf("stream %d headers done", int(streamID))
-	conn := (*ClientConn)(ptr)
+	conn := (*ClientConn)(unsafe.Pointer(uintptr(ptr)))
 	s, ok := conn.streams[int(streamID)]
 	if !ok {
 		//log.Println("onClientHeadersDoneCallback end")
@@ -403,7 +407,7 @@ func onClientHeadersDoneCallback(ptr unsafe.Pointer, streamID C.int) C.int {
 func onClientStreamClose(ptr unsafe.Pointer, streamID C.int) C.int {
 	//log.Println("onClientStreamClose begin")
 	//log.Printf("stream %d closed", int(streamID))
-	conn := (*ClientConn)(ptr)
+	conn := (*ClientConn)(unsafe.Pointer(uintptr(ptr)))
 
 	stream, ok := conn.streams[int(streamID)]
 	if ok {
@@ -421,7 +425,7 @@ func onClientStreamClose(ptr unsafe.Pointer, streamID C.int) C.int {
 
 //export onClientConnectionCloseCallback
 func onClientConnectionCloseCallback(ptr unsafe.Pointer) {
-	conn := (*ClientConn)(ptr)
+	conn := (*ClientConn)(unsafe.Pointer(uintptr(ptr)))
 	conn.err = io.EOF
 
 	// signal all goroutings exit
diff --git a/conn.go b/conn.go
index ca615ad..a1b031b 100644
--- a/conn.go
+++ b/conn.go
@@ -123,14 +123,16 @@ func (c *ClientConn) run() {
 			}
 			//log.Printf("read %d bytes from network", n)
 			lastDataRecv = time.Now()
-			d1 := C.CBytes(buf[:n])
+			//d1 := C.CBytes(buf[:n])
 
 			c.lock.Lock()
+			//ret1 := C.nghttp2_session_mem_recv(c.session,
+			//	(*C.uchar)(d1), C.size_t(n))
 			ret1 := C.nghttp2_session_mem_recv(c.session,
-				(*C.uchar)(d1), C.size_t(n))
+				(*C.uchar)(unsafe.Pointer(&buf[0])), C.size_t(n))
 			c.lock.Unlock()
 
-			C.free(d1)
+			//C.free(d1)
 			if int(ret1) < 0 {
 				c.lock.Lock()
 				c.err = fmt.Errorf("sesion recv error: %s",
@@ -209,46 +211,36 @@ func (c *ClientConn) Connect(addr string) (cs *ClientStream, statusCode int, err
 	if c.err != nil {
 		return nil, http.StatusServiceUnavailable, 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", "CONNECT", 0)
-	nvIndex++
-	//setNvArray(nva, nvIndex, ":scheme", "https", 0)
-	//nvIndex++
-	//log.Printf("header authority: %s", req.RequestURI)
-	setNvArray(nva, nvIndex, ":authority", addr, 0)
-	nvIndex++
+	var nv = []C.nghttp2_nv{}
+	nv = append(nv, newNV(":method", "CONNECT"))
+	nv = append(nv, newNV(":authority", addr))
 
 	var dp *dataProvider
-	var cdp *C.nghttp2_data_provider
-	dp, cdp = newDataProvider(c.lock)
+
+	s := &ClientStream{
+		conn:  c,
+		cdp:   C.nghttp2_data_provider{},
+		resch: make(chan *http.Response),
+		errch: make(chan error),
+		lock:  new(sync.Mutex),
+	}
+
+	dp = newDataProvider(unsafe.Pointer(&s.cdp), c.lock, 1)
+	s.dp = dp
 
 	c.lock.Lock()
-	streamID := C.nghttp2_submit_request(c.session, nil,
-		nva.nv, C.size_t(nvIndex), cdp, nil)
+	streamID := C._nghttp2_submit_request(c.session, nil,
+		C.size_t(uintptr(unsafe.Pointer(&nv[0]))), C.size_t(len(nv)), &s.cdp, nil)
 	c.lock.Unlock()
 
-	C.delete_nv_array(nva)
 	if int(streamID) < 0 {
 		return nil, http.StatusServiceUnavailable, fmt.Errorf(
 			"submit request error: %s", C.GoString(C.nghttp2_strerror(streamID)))
 	}
-	if dp != nil {
-		dp.streamID = int(streamID)
-		dp.session = c.session
-	}
+	dp.streamID = int(streamID)
+	dp.session = c.session
+	s.streamID = int(streamID)
 	//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
@@ -262,6 +254,12 @@ func (c *ClientConn) Connect(addr string) (cs *ClientStream, statusCode int, err
 		return nil, http.StatusServiceUnavailable, err
 	case res := <-s.resch:
 		if res != nil {
+			res.Request = &http.Request{
+				Method:     "CONNECT",
+				RequestURI: addr,
+				URL:        &url.URL{},
+				Host:       addr,
+			}
 			return s, res.StatusCode, nil
 		}
 		//log.Println("wait response, empty response")
@@ -271,23 +269,31 @@ func (c *ClientConn) Connect(addr string) (cs *ClientStream, statusCode int, err
 	}
 }
 
+func newNV(name, value string) C.nghttp2_nv {
+	nv := C.nghttp2_nv{}
+	nameArr := make([]byte, len(name)+1)
+	valueArr := make([]byte, len(value)+1)
+	copy(nameArr, []byte(name))
+	copy(valueArr, []byte(value))
+
+	nv.name = (*C.uchar)(unsafe.Pointer(&nameArr[0]))
+	nv.value = (*C.uchar)(unsafe.Pointer(&valueArr[0]))
+	nv.namelen = C.size_t(len(name))
+	nv.valuelen = C.size_t(len(value))
+	nv.flags = 0
+	return nv
+}
+
 // CreateRequest submit a request and return a http.Response,
 func (c *ClientConn) CreateRequest(req *http.Request) (*http.Response, error) {
 	if c.err != nil {
 		return nil, c.err
 	}
 
-	nvIndex := 0
-	nvMax := 25
-	nva := C.new_nv_array(C.size_t(nvMax))
-	setNvArray(nva, nvIndex, ":method", req.Method, 0)
-	nvIndex++
-	if req.Method != "CONNECT" {
-		setNvArray(nva, nvIndex, ":scheme", "https", 0)
-		nvIndex++
-	}
-	setNvArray(nva, nvIndex, ":authority", req.Host, 0)
-	nvIndex++
+	nv := []C.nghttp2_nv{}
+	nv = append(nv, newNV(":method", req.Method))
+	nv = append(nv, newNV(":scheme", "https"))
+	nv = append(nv, newNV(":authority", req.Host))
 
 	/*
 		:path must starts with "/"
@@ -299,10 +305,7 @@ func (c *ClientConn) CreateRequest(req *http.Request) (*http.Response, error) {
 		p = p + "?" + q
 	}
 
-	if req.Method != "CONNECT" {
-		setNvArray(nva, nvIndex, ":path", p, 0)
-		nvIndex++
-	}
+	nv = append(nv, newNV(":path", p))
 
 	//log.Printf("%s http://%s%s", req.Method, req.Host, p)
 	for k, v := range req.Header {
@@ -312,15 +315,23 @@ func (c *ClientConn) CreateRequest(req *http.Request) (*http.Response, error) {
 			continue
 		}
 		//log.Printf("header %s: %s", k, v)
-		setNvArray(nva, nvIndex, strings.Title(k), v[0], 0)
-		nvIndex++
+		nv = append(nv, newNV(k, v[0]))
 	}
 
 	var dp *dataProvider
-	var cdp *C.nghttp2_data_provider
+
+	s := &ClientStream{
+		//streamID: int(streamID),
+		conn:  c,
+		resch: make(chan *http.Response),
+		errch: make(chan error),
+		lock:  new(sync.Mutex),
+	}
 
 	if req.Method == "PUT" || req.Method == "POST" || req.Method == "CONNECT" {
-		dp, cdp = newDataProvider(c.lock)
+		s.cdp = C.nghttp2_data_provider{}
+		dp = newDataProvider(unsafe.Pointer(&s.cdp), c.lock, 1)
+		s.dp = dp
 		go func() {
 			io.Copy(dp, req.Body)
 			dp.Close()
@@ -328,17 +339,17 @@ func (c *ClientConn) CreateRequest(req *http.Request) (*http.Response, error) {
 	}
 
 	c.lock.Lock()
-	streamID := C.nghttp2_submit_request(c.session, nil,
-		nva.nv, C.size_t(nvIndex), cdp, nil)
+	streamID := C._nghttp2_submit_request(c.session, nil,
+		C.size_t(uintptr(unsafe.Pointer(&nv[0]))), C.size_t(len(nv)), &s.cdp, nil)
 	c.lock.Unlock()
 
-	C.delete_nv_array(nva)
+	//C.delete_nv_array(nva)
 
 	if int(streamID) < 0 {
 		return nil, fmt.Errorf("submit request error: %s",
 			C.GoString(C.nghttp2_strerror(streamID)))
 	}
-
+	s.streamID = int(streamID)
 	//log.Printf("new stream, id %d", int(streamID))
 
 	if dp != nil {
@@ -346,16 +357,6 @@ func (c *ClientConn) CreateRequest(req *http.Request) (*http.Response, error) {
 		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++
@@ -528,14 +529,16 @@ func (c *ServerConn) Run() {
 				break
 			}
 
-			d1 := C.CBytes(buf[:n])
+			//d1 := C.CBytes(buf[:n])
 
 			c.lock.Lock()
+			//ret1 := C.nghttp2_session_mem_recv(c.session,
+			//	(*C.uchar)(d1), C.size_t(n))
 			ret1 := C.nghttp2_session_mem_recv(c.session,
-				(*C.uchar)(d1), C.size_t(n))
+				(*C.uchar)(unsafe.Pointer(&buf[0])), C.size_t(n))
 			c.lock.Unlock()
 
-			C.free(d1)
+			//C.free(d1)
 			if int(ret1) < 0 {
 				c.lock.Lock()
 				c.err = fmt.Errorf("sesion recv error: %s",
diff --git a/data_provider.go b/data_provider.go
index 190a630..30b748c 100644
--- a/data_provider.go
+++ b/data_provider.go
@@ -6,7 +6,9 @@ package nghttp2
 import "C"
 import (
 	"bytes"
+	"errors"
 	"io"
+	"log"
 	"sync"
 	"time"
 	"unsafe"
@@ -28,6 +30,10 @@ type dataProvider struct {
 
 // Read read from data provider
 func (dp *dataProvider) Read(buf []byte) (n int, err error) {
+	if dp.buf == nil || dp.lock == nil || dp.sessLock == nil || dp.session == nil {
+		log.Println("db read invalid state")
+		return 0, errors.New("invalid state")
+	}
 	dp.lock.Lock()
 	defer dp.lock.Unlock()
 
@@ -40,6 +46,10 @@ func (dp *dataProvider) Read(buf []byte) (n int, err error) {
 
 // Write provider data for data provider
 func (dp *dataProvider) Write(buf []byte) (n int, err error) {
+	if dp.buf == nil || dp.lock == nil || dp.sessLock == nil || dp.session == nil {
+		log.Println("dp write invalid state")
+		return 0, errors.New("invalid state")
+	}
 	dp.lock.Lock()
 	defer dp.lock.Unlock()
 
@@ -59,6 +69,10 @@ func (dp *dataProvider) Write(buf []byte) (n int, err error) {
 
 // Close end to provide data
 func (dp *dataProvider) Close() error {
+	if dp.buf == nil || dp.lock == nil || dp.sessLock == nil || dp.session == nil {
+		log.Println("dp close, invalid state")
+		return errors.New("invalid state")
+	}
 	dp.lock.Lock()
 	defer dp.lock.Unlock()
 
@@ -77,15 +91,15 @@ func (dp *dataProvider) Close() error {
 	return nil
 }
 
-func newDataProvider(sessionLock *sync.Mutex) (
-	*dataProvider, *C.nghttp2_data_provider) {
+func newDataProvider(cdp unsafe.Pointer, sessionLock *sync.Mutex, t int) *dataProvider {
 	dp := &dataProvider{
 		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
+	C.data_provider_set_callback(C.size_t(uintptr(cdp)),
+		C.size_t(uintptr(unsafe.Pointer(dp))), C.int(t))
+	return dp
 }
 
 // bodyProvider provide data for http body
@@ -130,18 +144,3 @@ func (bp *bodyProvider) Close() error {
 	bp.closed = true
 	return nil
 }
-
-// setNvArray set the array for nghttp2_nv array
-func setNvArray(a *C.struct_nv_array, index int,
-	name, value string, flags int) {
-	cname := C.CString(name)
-	cvalue := C.CString(value)
-	cnamelen := C.size_t(len(name))
-	cvaluelen := C.size_t(len(value))
-	cflags := C.int(flags)
-
-	// note: cname and cvalue will freed in C.delete_nv_array
-
-	C.nv_array_set(a, C.int(index), cname,
-		cvalue, cnamelen, cvaluelen, cflags)
-}
diff --git a/nghttp2.c b/nghttp2.c
index ee8540b..dd0d91f 100644
--- a/nghttp2.c
+++ b/nghttp2.c
@@ -133,13 +133,6 @@ int send_server_connection_header(nghttp2_session *session)
     rv = nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv,
                                  ARRLEN(iv));
     return rv;
-    /*
-  if (rv != 0) {
-    // warnx("Fatal error: %s", nghttp2_strerror(rv));
-    return rv;
-  }
-  return 0;
-  */
 }
 
 // send_callback send data to network
@@ -148,14 +141,6 @@ static ssize_t client_send_callback(nghttp2_session *session, const uint8_t *dat
 {
     return onClientDataSendCallback(user_data, (void *)data, length);
 }
-/*
-// recv_callback read data from network
-static ssize_t client_recv_callback(nghttp2_session *session, uint8_t *buf,
-                                    size_t length, int flags, void *user_data)
-{
-    return onClientDataRecvCallback(user_data, (void *)buf, length);
-}
-*/
 
 static int on_client_header_callback(nghttp2_session *session,
                                      const nghttp2_frame *frame, const uint8_t *name,
@@ -286,11 +271,23 @@ static int on_client_stream_close_callback(nghttp2_session *session, int32_t str
     return 0;
 }
 
-static ssize_t data_source_read_callback(nghttp2_session *session, int32_t stream_id,
-                                         uint8_t *buf, size_t length, uint32_t *data_flags,
-                                         nghttp2_data_source *source, void *user_data)
+static ssize_t on_client_data_source_read_callback(nghttp2_session *session, int32_t stream_id,
+                                                   uint8_t *buf, size_t length, uint32_t *data_flags,
+                                                   nghttp2_data_source *source, void *user_data)
+{
+    int ret = onClientDataSourceReadCallback(user_data, stream_id, buf, length);
+    if (ret == 0)
+    {
+        *data_flags = NGHTTP2_DATA_FLAG_EOF;
+    }
+    return ret;
+}
+
+static ssize_t on_server_data_source_read_callback(nghttp2_session *session, int32_t stream_id,
+                                                   uint8_t *buf, size_t length, uint32_t *data_flags,
+                                                   nghttp2_data_source *source, void *user_data)
 {
-    int ret = onDataSourceReadCallback(source->ptr, buf, length);
+    int ret = onServerDataSourceReadCallback(user_data, stream_id, buf, length);
     if (ret == 0)
     {
         *data_flags = NGHTTP2_DATA_FLAG_EOF;
@@ -403,57 +400,31 @@ int32_t submit_request(nghttp2_session *session, nghttp2_nv *hdrs, size_t hdrlen
 }
 #endif
 
-struct nv_array *new_nv_array(size_t n)
+int data_provider_set_callback(size_t cdp, size_t data, int type)
 {
-    struct nv_array *a = malloc(sizeof(struct nv_array));
-    nghttp2_nv *nv = (nghttp2_nv *)malloc(n * sizeof(nghttp2_nv));
-    memset(nv, 0, n * sizeof(nghttp2_nv));
-    a->nv = nv;
-    a->len = n;
-    return a;
-}
-
-int nv_array_set(struct nv_array *a, int index,
-                 char *name, char *value,
-                 size_t namelen, size_t valuelen, int flag)
-{
-    if (index > (a->len - 1))
+    //nghttp2_data_provider *dp = malloc(sizeof(nghttp2_data_provider));
+    nghttp2_data_provider *dp = (nghttp2_data_provider *)cdp;
+    dp->source.ptr = (void *)((int *)data);
+    if (type == 0)
     {
-        return -1;
+        dp->read_callback = on_server_data_source_read_callback;
+    }
+    else
+    {
+        dp->read_callback = on_client_data_source_read_callback;
     }
-    nghttp2_nv *nv = &((a->nv)[index]);
-    nv->name = name;
-    nv->value = value;
-    nv->namelen = namelen;
-    nv->valuelen = valuelen;
-    nv->flags = flag;
     return 0;
 }
 
-void delete_nv_array(struct nv_array *a)
+int _nghttp2_submit_response(nghttp2_session *sess, int streamid,
+                             size_t nv, size_t nvlen, nghttp2_data_provider *dp)
 {
-    int i;
-    nghttp2_nv *nv;
-    for (i = 0; i < a->len; i++)
-    {
-        nv = &((a->nv)[i]);
-        if (nv->name != NULL)
-        {
-            free(nv->name);
-        }
-        if (nv->value != NULL)
-        {
-            free(nv->value);
-        }
-    }
-    free(a->nv);
-    free(a);
+    return nghttp2_submit_response(sess, streamid, (nghttp2_nv *)nv, nvlen, dp);
 }
 
-nghttp2_data_provider *new_data_provider(size_t data)
+int _nghttp2_submit_request(nghttp2_session *session, const nghttp2_priority_spec *pri_spec,
+                            size_t nva, size_t nvlen,
+                            const nghttp2_data_provider *data_prd, void *stream_user_data)
 {
-    nghttp2_data_provider *dp = malloc(sizeof(nghttp2_data_provider));
-    dp->source.ptr = (void *)((int *)data);
-    dp->read_callback = data_source_read_callback;
-    return dp;
+    return nghttp2_submit_request(session, pri_spec, (nghttp2_nv *)nva, nvlen, data_prd, stream_user_data);
 }
\ No newline at end of file
diff --git a/stream.go b/stream.go
index e6e22ae..bbfba34 100644
--- a/stream.go
+++ b/stream.go
@@ -7,6 +7,7 @@ import "C"
 import (
 	"fmt"
 	"io"
+	"log"
 	"net/http"
 	"strings"
 	"sync"
@@ -17,17 +18,13 @@ import (
 type ClientStream struct {
 	streamID int
 	conn     *ClientConn
-	cdp      *C.nghttp2_data_provider
+	cdp      C.nghttp2_data_provider
 	dp       *dataProvider
-	// application read data from stream
-	//r *io.PipeReader
-	// recv stream data from session
-	//w      *io.PipeWriter
-	res    *http.Response
-	resch  chan *http.Response
-	errch  chan error
-	closed bool
-	lock   *sync.Mutex
+	res      *http.Response
+	resch    chan *http.Response
+	errch    chan error
+	closed   bool
+	lock     *sync.Mutex
 }
 
 // Read read stream data
@@ -63,33 +60,21 @@ func (s *ClientStream) Close() error {
 	case s.errch <- err:
 	default:
 	}
-	//log.Println("close stream resch")
-	//close(s.resch)
-	//log.Println("close stream errch")
-	//close(s.errch)
-	//log.Println("close pipe w")
 	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
-	}
-	if s.cdp != nil {
-		C.free(unsafe.Pointer(s.cdp))
-		s.cdp = nil
 	}
 
-	s.conn.lock.Lock()
-	if _, ok := s.conn.streams[s.streamID]; ok {
-		delete(s.conn.streams, s.streamID)
+	if s.res != nil && s.res.Request != nil &&
+		s.res.Request.Method == "CONNECT" {
+		//log.Printf("send rst stream for %d", s.streamID)
+		s.conn.lock.Lock()
+		C.nghttp2_submit_rst_stream(s.conn.session, 0, C.int(s.streamID), 0)
+		s.conn.lock.Unlock()
 	}
-	s.conn.lock.Unlock()
-
 	return nil
 }
 
@@ -114,7 +99,7 @@ type ServerStream struct {
 
 	// data provider
 	dp  *dataProvider
-	cdp *C.nghttp2_data_provider
+	cdp C.nghttp2_data_provider
 
 	closed bool
 	//buf    *bytes.Buffer
@@ -147,39 +132,35 @@ func (s *ServerStream) WriteHeader(code int) {
 	s.responseSend = true
 	s.statusCode = code
 
-	nvIndex := 0
-	nvMax := 25
-
-	nva := C.new_nv_array(C.size_t(nvMax))
+	var nv = []C.nghttp2_nv{}
 
-	setNvArray(nva, nvIndex, ":status", fmt.Sprintf("%d", code), 0)
-	nvIndex++
+	nv = append(nv, newNV(":status", fmt.Sprintf("%d", code)))
 
 	for k, v := range s.header {
-		if strings.ToLower(k) == "host" {
+		//log.Println(k, v[0])
+		_k := strings.ToLower(k)
+		if _k == "host" || _k == "connection" || _k == "proxy-connection" ||
+			_k == "transfer-encoding" {
 			continue
 		}
-		//log.Printf("header %s: %s", k, v)
-		setNvArray(nva, nvIndex, strings.Title(k), v[0], 0)
-		nvIndex++
+		nv = append(nv, newNV(k, v[0]))
 	}
 
 	var dp *dataProvider
-	var cdp *C.nghttp2_data_provider
 
-	dp, cdp = newDataProvider(s.conn.lock)
+	dp = newDataProvider(unsafe.Pointer(&s.cdp), s.conn.lock, 0)
 	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)
+	ret := C._nghttp2_submit_response(
+		s.conn.session, C.int(s.streamID),
+		C.size_t(uintptr(unsafe.Pointer(&nv[0]))),
+		C.size_t(len(nv)), &s.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))))
@@ -203,26 +184,24 @@ func (s *ServerStream) Close() error {
 	}
 	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
+		//s.dp = nil
 	}
 
-	if s.cdp != nil {
-		C.free(unsafe.Pointer(s.cdp))
-		s.cdp = nil
-	}
+	if s.req.Method == "CONNECT" {
+		s.conn.lock.Lock()
+		s.conn.lock.Unlock()
 
-	s.conn.lock.Lock()
-	s.conn.lock.Unlock()
-
-	if _, ok := s.conn.streams[s.streamID]; ok {
-		delete(s.conn.streams, s.streamID)
+		if _, ok := s.conn.streams[s.streamID]; ok {
+			log.Printf("send rst stream %d", s.streamID)
+			C.nghttp2_submit_rst_stream(s.conn.session, 0, C.int(s.streamID), 0)
+			delete(s.conn.streams, s.streamID)
+		}
 	}
 	//log.Printf("stream %d closed", s.streamID)
 	return nil