I didn't agree with their conclusion. But the quoted part seemed correct. Some response codes are much more common than others. Redirects are followed by some o

I didn't agree with their conclusion. But the quoted part seemed correct. Some response codes are much more common than others. Redirects are followed by some other code unless the web site is broken in some way. 410 means the web site removed something. Most of the time 404 means the same. Or a link was generated incorrectly.