public async Task Invoke(HttpContext context)
        {
            try
            {
                await _next(context);
            }
            catch (Exception ex)
            {
                _logger.LogError("An unhandled exception has occurred: " + ex.Message, ex);
                // We can't do anything if the response has already started, just abort.
                if (context.Response.HasStarted)
                {
                    _logger.LogWarning("The response has already started, the error handler will not be executed.");
                    throw;
                }

                PathString originalPath = context.Request.Path;
                if (_options.ExceptionHandlingPath.HasValue)
                {
                    context.Request.Path = _options.ExceptionHandlingPath;
                }
                try
                {
                    context.Response.Clear();
                    var exceptionHandlerFeature = new ExceptionHandlerFeature()
                    {
                        Error = ex,
                    };
                    context.Features.Set<IExceptionHandlerFeature>(exceptionHandlerFeature);
                    context.Response.StatusCode = 500;
                    context.Response.OnStarting(_clearCacheHeadersDelegate, context.Response);

                    await _options.ExceptionHandler(context);

                    if (_diagnosticSource.IsEnabled("Microsoft.AspNet.Diagnostics.HandledException"))
                    {
                        _diagnosticSource.Write("Microsoft.AspNet.Diagnostics.HandledException", new { httpContext = context, exception = ex });
                    }

                    // TODO: Optional re-throw? We'll re-throw the original exception by default if the error handler throws.
                    return;
                }
                catch (Exception ex2)
                {
                    // Suppress secondary exceptions, re-throw the original.
                    _logger.LogError("An exception was thrown attempting to execute the error handler.", ex2);
                }
                finally
                {
                    context.Request.Path = originalPath;
                }
                throw; // Re-throw the original if we couldn't handle it
            }
        }