diff --git a/include/server/version.h b/include/server/version.h
index cc282d98..cf6cf015 100644
--- a/include/server/version.h
+++ b/include/server/version.h
@@ -28,7 +28,7 @@ GitHub: https://github.com/chronoxor/CppServer
 namespace CppServer {
 
 //! Project version
-const char version[] = "1.0.4.1";
+const char version[] = "1.0.4.2";
 
 } // namespace CppServer
 
diff --git a/source/server/ws/ws.cpp b/source/server/ws/ws.cpp
index 14f60626..46295fef 100644
--- a/source/server/ws/ws.cpp
+++ b/source/server/ws/ws.cpp
@@ -122,7 +122,7 @@ bool WebSocket::PerformServerUpgrade(const HTTP::HTTPRequest& request, HTTP::HTT
 
         if (CppCommon::StringUtils::CompareNoCase(key, "Connection"))
         {
-            if (!CppCommon::StringUtils::CompareNoCase(value, "Upgrade") && !CppCommon::StringUtils::CompareNoCase(value, "keep-alive, Upgrade"))
+            if (!CppCommon::StringUtils::CompareNoCase(value, "Upgrade") && !CppCommon::StringUtils::CompareNoCase(CppCommon::StringUtils::RemoveBlank(value), "keep-alive,Upgrade"))
             {
                 error = true;
                 response.MakeErrorResponse(400, "Invalid WebSocket handshaked request: 'Connection' header value must be 'Upgrade' or 'keep-alive, Upgrade'");