404. That’s an error.
The requested URL /add?source=atgs&feedurl=https://ec2-54-158-226-129.compute-1.amazonaws.com/blogs/harpy.rss was not found on this server. That’s all we know.
/add?source=atgs&feedurl=https://ec2-54-158-226-129.compute-1.amazonaws.com/blogs/harpy.rss