SignalR - CORS error

After updating SignalR my program started to fail with the following error message:

Access to XMLHttpRequest at 'http://localhost:22135/chat/negotiate?jwt=<removed the jwt key>' from origin 'http://localhost:53150' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.

To fix it I had to update the CORS policy by adding the AllowCredentials() method:

	services.AddCors(options =>
	{
	options.AddPolicy("AllowAllOrigins",
	builder =>
	{
	builder
	.AllowAnyOrigin()
	.AllowAnyHeader()
	.AllowAnyMethod()
	.AllowCredentials();
	});
	});

view raw CORS.cs hosted with ❤ by GitHub