# Microsoft.AspNetCore

``` diff
 namespace Microsoft.AspNetCore {
     public static class WebHost {
-        public static IWebHost Start(string url, RequestDelegate app);
+        public static IWebHost Start([StringSyntaxAttribute("Uri")] string url, RequestDelegate app);
-        public static IWebHost Start(string url, Action<IRouteBuilder> routeBuilder);
+        public static IWebHost Start([StringSyntaxAttribute("Uri")] string url, Action<IRouteBuilder> routeBuilder);
-        public static IWebHost StartWith(string url, Action<IApplicationBuilder> app);
+        public static IWebHost StartWith([StringSyntaxAttribute("Uri")] string url, Action<IApplicationBuilder> app);
     }
 }
```

