Fix swagger json route for hosting.

Gameboard.ShogiUI.Sockets/Startup.cs

@@ -180,6 +180,12 @@ namespace Gameboard.ShogiUI.Sockets
 						ClientId = "c1e94676-cab0-42ba-8b6c-9532b8486fff",
 						UsePkceWithAuthorizationCodeGrant = true
 					};
+					config.TransformToExternalPath = (route, request) =>
+					{
+						return request.Host.HasValue && request.Host.Value.Contains("localhost")
+						? route
+						: $"/Gameboard.ShogiUI.Sockets{route}";
+					};
 					//config.WithCredentials = true;
 				})
 				.UseWebSockets(socketOptions)