HTTP 508 Loop Detected Error

Main causes

Misconfigured server-side rewrite rules causing recursive redirection.
Poorly implemented WebDAV properties that create cyclic dependencies.
Errors in the client's request, particularly in the handling of "Depth: infinity", leading to unintended recursive operations.
Server-side scripts or configurations that inadvertently create infinite loops during data processing.

# Request example 
curl -X POST https://sandbox.oxylabs.io/ -H 'Accept: */*;q=0.8' -H 'Accept-Encoding: br' -H 'User-Agent: Mozilla/5.0'

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Check the HTTP version used in your request and compare it with the versions supported by the server.
Update your client or server software to ensure compatibility with the HTTP version used.
Modify the HTTP version in your request headers to match one that the server supports.
Contact the server administrator to confirm the supported HTTP versions and request an update if necessary.

# Response example 
HTTP/1.1 508 Loop Detected
Content-Type: text/html; charset=UTF-8
Content-Length: 49

508 Loop Detected

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From

401 Unauthorized	403 Forbidden	404 Not found	405 Method not allowed	406 Not acceptable
407 Proxy authentication required	408 Request timeout	409 Conflict	410 Gone	411 Length required
412 Precondition failed	413 Payload too large	414 Uri too long	415 Unsupported media type	416 Range not satisfiable
417 Expectation failed	421 Misdirected request	422 Unprocessable entity	423 Locked	424 Failed dependency
426 Upgrade required	428 Precondition required	429 Too many requests	431 Request header fields too large	444 Connection: close
451 Unavailable for legal reasons	499 Client closed request	501 Not implemented	503 Service unavailable	505 Http version not supported
506 Variant also negotiates	507 Insufficient storage	508 Loop detected	510 Not extended	511 Network authentication required