diff --git a/protocol/rtsp/rtsp.go b/protocol/rtsp/rtsp.go
index 006d2375..ebe5d978 100644
--- a/protocol/rtsp/rtsp.go
+++ b/protocol/rtsp/rtsp.go
@@ -34,7 +34,7 @@ func NewSession() *Session {
 }
 
 func (s *Session) Describe(urlStr string) (*Response, error) {
-	return s.writeRequest(describe, urlStr, func(req *request) { req.Header.Add("Accept", "application/sdp") }, nil)
+	return s.writeRequest(describe, urlStr, func(req *Request) { req.Header.Add("Accept", "application/sdp") }, nil)
 }
 
 func (s *Session) Options(urlStr string) (*Response, error) {
@@ -45,7 +45,7 @@ func (s *Session) Setup(urlStr, transport string) (*Response, error) {
 	return s.writeRequest(
 		setup,
 		urlStr,
-		func(req *request) {
+		func(req *Request) {
 			req.Header.Add("Transport", transport)
 		},
 		func(resp *Response) {
@@ -55,25 +55,15 @@ func (s *Session) Setup(urlStr, transport string) (*Response, error) {
 }
 
 func (s *Session) Play(urlStr string) (*Response, error) {
-	return s.writeRequest(play, urlStr, func(req *request) { req.Header.Add("Session", s.session) }, nil)
+	return s.writeRequest(play, urlStr, func(req *Request) { req.Header.Add("Session", s.session) }, nil)
 }
 
-func (s *Session) writeRequest(method, urlStr string, headerOp func(*request), respOp func(*Response)) (*Response, error) {
-	u, err := url.Parse(urlStr)
+func (s *Session) writeRequest(method, urlStr string, headerOp func(*Request), respOp func(*Response)) (*Response, error) {
+	req, err := NewRequest(method, urlStr, s.nextCSeq(), nil)
 	if err != nil {
 		return nil, err
 	}
 
-	req := (*request)(&http.Request{
-		Method:     method,
-		URL:        u,
-		Proto:      "RTSP",
-		ProtoMajor: 1,
-		ProtoMinor: 0,
-		Header:     map[string][]string{"CSeq": []string{s.nextCSeq()}},
-		Body:       nil,
-	})
-
 	if headerOp != nil {
 		headerOp(req)
 	}
@@ -85,7 +75,7 @@ func (s *Session) writeRequest(method, urlStr string, headerOp func(*request), r
 		}
 	}
 
-	_, err = io.WriteString(s.conn, req.String())
+	_, err = io.WriteString(s.conn, (*Request)(req).String())
 	if err != nil {
 		return nil, err
 	}
@@ -106,9 +96,18 @@ func (s *Session) nextCSeq() string {
 	return strconv.Itoa(s.cSeq)
 }
 
-type request http.Request
+type Request struct {
+	Method        string
+	URL           *url.URL
+	Proto         string
+	ProtoMajor    int
+	ProtoMinor    int
+	Header        http.Header
+	ContentLength int
+	Body          io.ReadCloser
+}
 
-func (r *request) String() string {
+func (r Request) String() string {
 	s := fmt.Sprintf("%s %s %s/%d.%d\r\n", r.Method, r.URL, r.Proto, r.ProtoMajor, r.ProtoMinor)
 	for k, v := range r.Header {
 		for _, v := range v {
@@ -123,36 +122,22 @@ func (r *request) String() string {
 	return s
 }
 
-type closer struct {
-	*bufio.Reader
-	r io.Reader
-}
+func NewRequest(method, urlStr, cSeq string, body io.ReadCloser) (*Request, error) {
+	u, err := url.Parse(urlStr)
+	if err != nil {
+		return nil, err
+	}
 
-func (c closer) Close() error {
-	if c.Reader == nil {
-		return nil
+	req := &Request{
+		Method:     method,
+		URL:        u,
+		Proto:      "RTSP",
+		ProtoMajor: 1,
+		ProtoMinor: 0,
+		Header:     map[string][]string{"CSeq": []string{cSeq}},
+		Body:       body,
 	}
-	defer func() {
-		c.Reader = nil
-		c.r = nil
-	}()
-	if r, ok := c.r.(io.ReadCloser); ok {
-		return r.Close()
-	}
-	return nil
-}
-
-func ParseRTSPVersion(s string) (proto string, major int, minor int, err error) {
-	parts := strings.SplitN(s, "/", 2)
-	proto = parts[0]
-	parts = strings.SplitN(parts[1], ".", 2)
-	if major, err = strconv.Atoi(parts[0]); err != nil {
-		return
-	}
-	if minor, err = strconv.Atoi(parts[0]); err != nil {
-		return
-	}
-	return
+	return req, nil
 }
 
 type Response struct {
@@ -220,3 +205,35 @@ func ReadResponse(r io.Reader) (res *Response, err error) {
 	res.Body = closer{b, r}
 	return
 }
+
+type closer struct {
+	*bufio.Reader
+	r io.Reader
+}
+
+func (c closer) Close() error {
+	if c.Reader == nil {
+		return nil
+	}
+	defer func() {
+		c.Reader = nil
+		c.r = nil
+	}()
+	if r, ok := c.r.(io.ReadCloser); ok {
+		return r.Close()
+	}
+	return nil
+}
+
+func ParseRTSPVersion(s string) (proto string, major int, minor int, err error) {
+	parts := strings.SplitN(s, "/", 2)
+	proto = parts[0]
+	parts = strings.SplitN(parts[1], ".", 2)
+	if major, err = strconv.Atoi(parts[0]); err != nil {
+		return
+	}
+	if minor, err = strconv.Atoi(parts[0]); err != nil {
+		return
+	}
+	return
+}