diff --git a/trunk/src/app/srs_app_http.cpp b/trunk/src/app/srs_app_http.cpp
index 15728f114..a63658f16 100644
--- a/trunk/src/app/srs_app_http.cpp
+++ b/trunk/src/app/srs_app_http.cpp
@@ -306,51 +306,9 @@ int SrsGoHttpFileServer::serve_http(ISrsGoHttpResponseWriter* w, SrsHttpMessage*
     // handle file according to its extension.
     // use vod stream for .flv/.fhv
     if (srs_string_ends_with(fullpath, ".flv") || srs_string_ends_with(fullpath, ".fhv")) {
-        std::string start = r->query_get("start");
-        if (start.empty()) {
-            return serve_file(w, r, fullpath);
-        }
-
-        int offset = ::atoi(start.c_str());
-        if (offset <= 0) {
-            return serve_file(w, r, fullpath);
-        }
-        
-        return serve_flv_stream(w, r, fullpath, offset);
+        return serve_flv_file(w, r, fullpath);
     } else if (srs_string_ends_with(fullpath, ".mp4")) {
-        // for flash to request mp4 range in query string.
-        // for example, http://digitalprimates.net/dash/DashTest.html?url=http://dashdemo.edgesuite.net/digitalprimates/nexus/oops-20120802-manifest.mpd
-        std::string range = r->query_get("range");
-        // or, use bytes to request range,
-        // for example, http://dashas.castlabs.com/demo/try.html
-        if (range.empty()) {
-            range = r->query_get("bytes");
-        }
-
-        // rollback to serve whole file.
-        size_t pos = string::npos;
-        if (range.empty() || (pos = range.find("-")) == string::npos) {
-            return serve_file(w, r, fullpath);
-        }
-
-        // parse the start in query string
-        int start = 0;
-        if (pos > 0) {
-            start = ::atoi(range.substr(0, pos).c_str());
-        }
-
-        // parse end in query string.
-        int end = -1;
-        if (pos < range.length() - 1) {
-            end = ::atoi(range.substr(pos + 1).c_str());
-        }
-
-        // invalid param, serve as whole mp4 file.
-        if (start < 0 || (end != -1 && start > end)) {
-            return serve_file(w, r, fullpath);
-        }
-        
-        return serve_mp4_range(w, r, fullpath, start, end);
+        return serve_mp4_file(w, r, fullpath);
     }
 
     // serve common static file.
@@ -427,12 +385,64 @@ int SrsGoHttpFileServer::serve_file(ISrsGoHttpResponseWriter* w, SrsHttpMessage*
     return w->final_request();
 }
 
+int SrsGoHttpFileServer::serve_flv_file(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, string fullpath)
+{
+    std::string start = r->query_get("start");
+    if (start.empty()) {
+        return serve_file(w, r, fullpath);
+    }
+
+    int offset = ::atoi(start.c_str());
+    if (offset <= 0) {
+        return serve_file(w, r, fullpath);
+    }
+        
+    return serve_flv_stream(w, r, fullpath, offset);
+}
+
+int SrsGoHttpFileServer::serve_mp4_file(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, string fullpath)
+{
+    // for flash to request mp4 range in query string.
+    // for example, http://digitalprimates.net/dash/DashTest.html?url=http://dashdemo.edgesuite.net/digitalprimates/nexus/oops-20120802-manifest.mpd
+    std::string range = r->query_get("range");
+    // or, use bytes to request range,
+    // for example, http://dashas.castlabs.com/demo/try.html
+    if (range.empty()) {
+        range = r->query_get("bytes");
+    }
+
+    // rollback to serve whole file.
+    size_t pos = string::npos;
+    if (range.empty() || (pos = range.find("-")) == string::npos) {
+        return serve_file(w, r, fullpath);
+    }
+
+    // parse the start in query string
+    int start = 0;
+    if (pos > 0) {
+        start = ::atoi(range.substr(0, pos).c_str());
+    }
+
+    // parse end in query string.
+    int end = -1;
+    if (pos < range.length() - 1) {
+        end = ::atoi(range.substr(pos + 1).c_str());
+    }
+
+    // invalid param, serve as whole mp4 file.
+    if (start < 0 || (end != -1 && start > end)) {
+        return serve_file(w, r, fullpath);
+    }
+        
+    return serve_mp4_stream(w, r, fullpath, start, end);
+}
+
 int SrsGoHttpFileServer::serve_flv_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, string fullpath, int offset)
 {
     return serve_file(w, r, fullpath);
 }
 
-int SrsGoHttpFileServer::serve_mp4_range(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, string fullpath, int start, int end)
+int SrsGoHttpFileServer::serve_mp4_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, string fullpath, int start, int end)
 {
     return serve_file(w, r, fullpath);
 }
diff --git a/trunk/src/app/srs_app_http.hpp b/trunk/src/app/srs_app_http.hpp
index 6a9816b61..43a0a5be0 100644
--- a/trunk/src/app/srs_app_http.hpp
+++ b/trunk/src/app/srs_app_http.hpp
@@ -149,6 +149,7 @@ public:
     // will trigger an implicit WriteHeader(http.StatusOK).
     // Thus explicit calls to WriteHeader are mainly used to
     // send error codes.
+    // @remark, user must set header then write or write_header.
     virtual void write_header(int code) = 0;
 };
 
@@ -211,11 +212,14 @@ public:
     virtual ~SrsGoHttpFileServer();
 public:
     virtual int serve_http(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r);
-protected:
+private:
     /**
     * serve the file by specified path
     */
     virtual int serve_file(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath);
+    virtual int serve_flv_file(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath);
+    virtual int serve_mp4_file(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath);
+protected:
     /**
     * when access flv file with x.flv?start=xxx
     */
@@ -226,7 +230,7 @@ protected:
     * @param end the end offset in bytes. -1 to end of file.
     * @remark response data in [start, end].
     */
-    virtual int serve_mp4_range(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath, int start, int end);
+    virtual int serve_mp4_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath, int start, int end);
 protected:
     /**
     * copy the fs to response writer in size bytes.
diff --git a/trunk/src/app/srs_app_http_conn.cpp b/trunk/src/app/srs_app_http_conn.cpp
index 60dcaf687..86fbdfad3 100644
--- a/trunk/src/app/srs_app_http_conn.cpp
+++ b/trunk/src/app/srs_app_http_conn.cpp
@@ -141,7 +141,7 @@ int SrsVodStream::serve_flv_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage*
     return ret;
 }
 
-int SrsVodStream::serve_mp4_range(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, string fullpath, int start, int end)
+int SrsVodStream::serve_mp4_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, string fullpath, int start, int end)
 {
     int ret = ERROR_SUCCESS;
 
diff --git a/trunk/src/app/srs_app_http_conn.hpp b/trunk/src/app/srs_app_http_conn.hpp
index 2a51d7559..dedae7d12 100644
--- a/trunk/src/app/srs_app_http_conn.hpp
+++ b/trunk/src/app/srs_app_http_conn.hpp
@@ -66,7 +66,7 @@ public:
     virtual ~SrsVodStream();
 protected:
     virtual int serve_flv_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath, int offset);
-    virtual int serve_mp4_range(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath, int start, int end);
+    virtual int serve_mp4_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath, int start, int end);
 };
 
 /**
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index a365d4169..8e441ace4 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR       2
 #define VERSION_MINOR       0
-#define VERSION_REVISION    102
+#define VERSION_REVISION    103
 
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"