diff --git a/trunk/src/app/srs_app_hls.cpp b/trunk/src/app/srs_app_hls.cpp
index 801e72579..1f0c6bba0 100644
--- a/trunk/src/app/srs_app_hls.cpp
+++ b/trunk/src/app/srs_app_hls.cpp
@@ -396,47 +396,6 @@ private:
     }
 };
 
-SrsSimpleBuffer::SrsSimpleBuffer()
-{
-}
-
-SrsSimpleBuffer::~SrsSimpleBuffer()
-{
-}
-
-int SrsSimpleBuffer::length()
-{
-    int len = (int)data.size();
-    srs_assert(len >= 0);
-    return len;
-}
-
-char* SrsSimpleBuffer::bytes()
-{
-    return (length() == 0)? NULL : &data.at(0);
-}
-
-void SrsSimpleBuffer::erase(int size)
-{
-    if (size <= 0) {
-        return;
-    }
-    
-    if (size >= length()) {
-        data.clear();
-        return;
-    }
-    
-    data.erase(data.begin(), data.begin() + size);
-}
-
-void SrsSimpleBuffer::append(const char* bytes, int size)
-{
-    srs_assert(size > 0);
-
-    data.insert(data.end(), bytes, bytes + size);
-}
-
 SrsHlsAacJitter::SrsHlsAacJitter()
 {
     base_pts = 0;
diff --git a/trunk/src/app/srs_app_hls.hpp b/trunk/src/app/srs_app_hls.hpp
index 923b56859..8b77945b6 100644
--- a/trunk/src/app/srs_app_hls.hpp
+++ b/trunk/src/app/srs_app_hls.hpp
@@ -61,43 +61,7 @@ class SrsRequest;
 class SrsPithyPrint;
 class SrsSource;
 class SrsFileWriter;
-
-/**
-* the simple buffer use vector to append bytes,
-* it's for hls, and need to be refined in future.
-*/
-class SrsSimpleBuffer
-{
-private:
-    std::vector<char> data;
-public:
-    SrsSimpleBuffer();
-    virtual ~SrsSimpleBuffer();
-public:
-    /**
-    * get the length of buffer. empty if zero.
-    * @remark assert length() is not negative.
-    */
-    virtual int length();
-    /**
-    * get the buffer bytes.
-    * @return the bytes, NULL if empty.
-    */
-    virtual char* bytes();
-    /**
-    * erase size of bytes from begin.
-    * @param size to erase size of bytes. 
-    *       clear if size greater than or equals to length()
-    * @remark ignore size is not positive.
-    */
-    virtual void erase(int size);
-    /**
-    * append specified bytes to buffer.
-    * @param size the size of bytes
-    * @remark assert size is positive.
-    */
-    virtual void append(const char* bytes, int size);
-};
+class SrsSimpleBuffer;
 
 /**
 * jitter correct for audio,
diff --git a/trunk/src/app/srs_app_http.cpp b/trunk/src/app/srs_app_http.cpp
index 9494b431d..3cc17e5d7 100644
--- a/trunk/src/app/srs_app_http.cpp
+++ b/trunk/src/app/srs_app_http.cpp
@@ -537,7 +537,7 @@ SrsHttpHandler* SrsHttpHandler::create_http_stream()
 
 SrsHttpMessage::SrsHttpMessage()
 {
-    _body = new SrsBuffer();
+    _body = new SrsSimpleBuffer();
     _state = SrsHttpParseStateInit;
     _uri = new SrsHttpUri();
     _match = NULL;
diff --git a/trunk/src/app/srs_app_http.hpp b/trunk/src/app/srs_app_http.hpp
index a9dd80a59..27822ee0e 100644
--- a/trunk/src/app/srs_app_http.hpp
+++ b/trunk/src/app/srs_app_http.hpp
@@ -39,7 +39,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_app_st.hpp>
 
-class SrsBuffer;
+class SrsSimpleBuffer;
 class SrsRequest;
 class SrsStSocket;
 class SrsHttpUri;
@@ -214,7 +214,7 @@ private:
     * body object, in bytes.
     * @remark, user can get body in string by get_body().
     */
-    SrsBuffer* _body;
+    SrsSimpleBuffer* _body;
     /**
     * parser state
     * @remark, user can use is_complete() to determine the state.
diff --git a/trunk/src/rtmp/srs_protocol_buffer.cpp b/trunk/src/rtmp/srs_protocol_buffer.cpp
index 68122c24a..4eb05edb3 100644
--- a/trunk/src/rtmp/srs_protocol_buffer.cpp
+++ b/trunk/src/rtmp/srs_protocol_buffer.cpp
@@ -27,6 +27,47 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_kernel_log.hpp>
 #include <srs_kernel_utility.hpp>
 
+SrsSimpleBuffer::SrsSimpleBuffer()
+{
+}
+
+SrsSimpleBuffer::~SrsSimpleBuffer()
+{
+}
+
+int SrsSimpleBuffer::length()
+{
+    int len = (int)data.size();
+    srs_assert(len >= 0);
+    return len;
+}
+
+char* SrsSimpleBuffer::bytes()
+{
+    return (length() == 0)? NULL : &data.at(0);
+}
+
+void SrsSimpleBuffer::erase(int size)
+{
+    if (size <= 0) {
+        return;
+    }
+    
+    if (size >= length()) {
+        data.clear();
+        return;
+    }
+    
+    data.erase(data.begin(), data.begin() + size);
+}
+
+void SrsSimpleBuffer::append(const char* bytes, int size)
+{
+    srs_assert(size > 0);
+
+    data.insert(data.end(), bytes, bytes + size);
+}
+
 IMergeReadHandler::IMergeReadHandler()
 {
 }
diff --git a/trunk/src/rtmp/srs_protocol_buffer.hpp b/trunk/src/rtmp/srs_protocol_buffer.hpp
index 7ef91299f..89d02182e 100644
--- a/trunk/src/rtmp/srs_protocol_buffer.hpp
+++ b/trunk/src/rtmp/srs_protocol_buffer.hpp
@@ -34,6 +34,43 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_protocol_io.hpp>
 
+/**
+* the simple buffer use vector to append bytes,
+* it's for hls and http, and need to be refined in future.
+*/
+class SrsSimpleBuffer
+{
+private:
+    std::vector<char> data;
+public:
+    SrsSimpleBuffer();
+    virtual ~SrsSimpleBuffer();
+public:
+    /**
+    * get the length of buffer. empty if zero.
+    * @remark assert length() is not negative.
+    */
+    virtual int length();
+    /**
+    * get the buffer bytes.
+    * @return the bytes, NULL if empty.
+    */
+    virtual char* bytes();
+    /**
+    * erase size of bytes from begin.
+    * @param size to erase size of bytes. 
+    *       clear if size greater than or equals to length()
+    * @remark ignore size is not positive.
+    */
+    virtual void erase(int size);
+    /**
+    * append specified bytes to buffer.
+    * @param size the size of bytes
+    * @remark assert size is positive.
+    */
+    virtual void append(const char* bytes, int size);
+};
+
 // 4KB=4096
 // 8KB=8192
 // 16KB=16384
@@ -97,6 +134,7 @@ public:
     * @return the bytes, NULL if empty.
     */
     virtual char* bytes();
+public:
     /**
     * erase size of bytes from begin.
     * @param size to erase size of bytes. 
@@ -104,6 +142,7 @@ public:
     * @remark ignore size is not positive.
     */
     virtual void erase(int size);
+private:
     /**
     * append specified bytes to buffer.
     * @param size the size of bytes