IEndpointFilter usage in FastEndpoints

EndpointFilter.cs

sealed class OperationCancelledFilter : IEndpointFilter
{
    private readonly ILogger<OperationCancelledFilter> logger;

    public OperationCancelledFilter(ILogger<OperationCancelledFilter> logger)
    {
        this.logger = logger;
    }

    public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
    {
        try
        {
            return await next(context);
        }
        catch (OperationCanceledException x)
        {
            logger.LogDebug(x, "Request was cancelled!");
            return Results.StatusCode(499);
        }
    }
}

Endpoints.cs

// to only apply the filter to a certain endpoint
public override void Configure()
{
    Post("order/create");
    Options(x => x.AddEndpointFilter<OperationCancelledFilter>());
}

Program.cs

// to apply the filter globally to all endpoints
app.UseFastEndpoints(c => c.Endpoints.Configurator = ep =>
{
    ep.Options(b => b.AddEndpointFilter<OperationCancelledFilter>());
});