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
}
}