404. That’s an error.
The requested URL /add?source=atgs&feedurl=http%3A%2F%2Fhit.com.vn%2Fwp-content%2Fthemes%2Fthiet-ke-website%2Fimages%2Ffavicon.ico was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http%3A%2F%2Fhit.com.vn%2Fwp-content%2Fthemes%2Fthiet-ke-website%2Fimages%2Ffavicon.ico