diff --git a/README.md b/README.md
index 9b5a5e177..d90009bd9 100755
--- a/README.md
+++ b/README.md
@@ -184,6 +184,7 @@ Please select according to languages:
 
 ### V3 changes
 
+* v3.0, 2018-11-11, Merge [#1261][bug #1261], Support `_definst_` for Wowza. 3.0.44
 * v3.0, 2018-08-26, SRS [console](https://github.com/ossrs/srs-ngb) support both [Chinese](http://ossrs.net:1985/console/ng_index.html) and [English](http://ossrs.net:1985/console/en_index.html).
 * v3.0, 2018-08-25, Fix [#1093][bug #1093], Support HLS encryption. 3.0.42
 * v3.0, 2018-08-25, Fix [#1051][bug #1051], Drop ts when republishing stream. 3.0.41
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index fa4f69e38..129683acb 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -27,7 +27,7 @@
 // current release version
 #define VERSION_MAJOR       3
 #define VERSION_MINOR       0
-#define VERSION_REVISION   42
+#define VERSION_REVISION   44
 
 // generated by configure, only macros.
 #include <srs_auto_headers.hpp>
diff --git a/trunk/src/kernel/srs_kernel_utility.cpp b/trunk/src/kernel/srs_kernel_utility.cpp
index 2c635d9e9..49596d3e6 100644
--- a/trunk/src/kernel/srs_kernel_utility.cpp
+++ b/trunk/src/kernel/srs_kernel_utility.cpp
@@ -356,10 +356,10 @@ string srs_erase_first_substr(string str, string erase_string)
 
 	size_t pos = ret.find(erase_string);
 
-	if (pos != std::string::npos)
-	{
+	if (pos != std::string::npos) {
 		ret.erase(pos, erase_string.length());
 	}
+    
 	return ret;
 }
 
@@ -369,10 +369,10 @@ string srs_erase_last_substr(string str, string erase_string)
 
 	size_t pos = ret.rfind(erase_string);
 
-	if (pos != std::string::npos)
-	{
+	if (pos != std::string::npos) {
 		ret.erase(pos, erase_string.length());
 	}
+    
 	return ret;
 }
 
diff --git a/trunk/src/protocol/srs_protocol_utility.cpp b/trunk/src/protocol/srs_protocol_utility.cpp
index 402875f35..377f10979 100644
--- a/trunk/src/protocol/srs_protocol_utility.cpp
+++ b/trunk/src/protocol/srs_protocol_utility.cpp
@@ -63,6 +63,10 @@ void srs_vhost_resolve(string& vhost, string& app, string& param)
     app = srs_string_replace(app, "&&", "?");
     app = srs_string_replace(app, "=", "?");
     
+    if (srs_string_ends_with(app, "/_definst_")) {
+        app = srs_erase_last_substr(app, "/_definst_");
+    }
+    
     if ((pos = app.find("?")) != std::string::npos) {
         std::string query = app.substr(pos + 1);
         app = app.substr(0, pos);