Nullability of reference types in return type of 'ValueTask<object> APIKeyEndpointFilter.InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)' doesn't match implicitly implemented member 'ValueTask<object?> IEndpointFilter.InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)'.

Dereference of a possibly null reference.

Possible null reference return.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'path1' in 'string Path.Combine(string path1, string path2)'.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'path1' in 'string Path.Combine(string path1, string path2)'.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.