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 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)'.

Dereference of a possibly null reference.

Possible null reference return.

Dereference of a possibly null reference.

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.