Check for broken links here: Link Checker
Note: The term URL stands for Universal Resource Location - for example the actual address of a webpage - whereas URI stands for Universal Resource Identifier, meaning the name of a particular resource. Although the two terms are frequently used interchangeably, they are semantically distinct.Timeout
The server did not respond to the URL request within the allotted time.
Redirection Loop / Too Many Redirections
The URL results in a redirection (e.g. 301 or 302) either back to itself, or to a chain of redirections which either eventually reaches the original URL or appears to be endless. Note that redirections sometimes depend on whether cookies are enabled.