Fix a bug that caused a crash on empty HTTP requests (localhost only) and add a lightweight lock to the RX queue to prevent possible threads stepping on each other in parallel receive paths.

service/OneService.cpp

@@ -1063,6 +1063,8 @@ public:
 					else urlArgs[a->substr(0,eqpos)] = a->substr(eqpos + 1);
 				}
 			}
+		} else {
+			return 404;
 		}
 
 		bool isAuth = false;