The HyperText Transfer Protocol (HTTP)
508 Loop Detected response status code may be given in the context of the Web Distributed Authoring and Versioning (WebDAV) protocol.
It indicates that the server terminated an operation because it encountered an infinite loop while processing a request with "Depth: infinity". This status indicates that the entire operation failed.
508 Loop Detected
|RFC 5842, section 7.2: 508 Loop Detected||Web Distributed Authoring and Versioning|