HTTP Status Codes
HTTP Status Code Reference Guide
507 Insufficient Storage WebDAV (HTTP Status Code 507)
HTTP 507 (Insufficient Storage) is a WebDAV status code indicating that the server does not have enough storage space to complete the request.
508 Loop Detected WebDAV (HTTP Status Code 508)
HTTP 508 (Loop Detected) is a WebDAV status code, indicating that the server has detected an infinite loop.
510 Not Extended (HTTP Status Code 510)
The HTTP 510 status code indicates that the server requires further extensions to fulfill the request.
511 Network Authentication Required (HTTP Status Code 511)
HTTP 511 (Network Authentication Required) status code indicates that the client needs to perform network authentication to gain network access.