diff --git a/trunk/src/protocol/srs_http_stack.cpp b/trunk/src/protocol/srs_http_stack.cpp
index 2f4e6dcb8..b798c7de7 100644
--- a/trunk/src/protocol/srs_http_stack.cpp
+++ b/trunk/src/protocol/srs_http_stack.cpp
@@ -116,7 +116,7 @@ bool srs_go_http_body_allowd(int status)
 // returns "application/octet-stream".
 string srs_go_http_detect(char* data, int size)
 {
-    // TODO: Implement the content detecting.
+    // TODO: Implement the request content-type detecting.
     return "application/octet-stream"; // fallback
 }
 
diff --git a/trunk/src/utest/srs_utest_http.cpp b/trunk/src/utest/srs_utest_http.cpp
index 9da963ef4..6b33b04d6 100644
--- a/trunk/src/utest/srs_utest_http.cpp
+++ b/trunk/src/utest/srs_utest_http.cpp
@@ -35,3 +35,8 @@ VOID TEST(ProtocolHTTPTest, StatusCode2Text)
     EXPECT_FALSE(srs_go_http_body_allowd(SRS_CONSTS_HTTP_NotModified));
     EXPECT_TRUE(srs_go_http_body_allowd(SRS_CONSTS_HTTP_OK));
 }
+
+VOID TEST(ProtocolHTTPTest, ResponseDetect)
+{
+    EXPECT_STREQ("application/octet-stream", srs_go_http_detect(NULL, 0).c_str());
+}