diff --git a/components/security_apps/waap/waap_clib/Waf2Util.cc b/components/security_apps/waap/waap_clib/Waf2Util.cc
index ea49714..11d6684 100755
--- a/components/security_apps/waap/waap_clib/Waf2Util.cc
+++ b/components/security_apps/waap/waap_clib/Waf2Util.cc
@@ -1917,6 +1917,9 @@ isGzipped(const string &stream)
 {
     if (stream.size() < 2) return false;
     auto unsinged_stream = reinterpret_cast<const u_char *>(stream.data());
+    dbgTrace(D_WAAP) << "isGzipped: first two bytes: "
+        << std::hex << static_cast<int>(unsinged_stream[0]) << " "
+        << std::hex << static_cast<int>(unsinged_stream[1]);
     return unsinged_stream[0] == 0x1f && unsinged_stream[1] == 0x8b;
 }