HTTP 401 Unauthorized Error

Main causes

Incorrect or missing credentials provided by the client.
The authentication method required by the server is not supported by the client.
The authentication data provided by the client has expired or is no longer valid.
The client did not provide any authentication data.

# Request example 
curl -X PUT https://sandbox.oxylabs.io/ -H 'Accept: application/xml;q=0.9' -H 'Accept-Encoding: compress' -H 'User-Agent: Mozilla/5.0'

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Common fixes

Ensure that the correct authentication credentials (username and password) are used for the request.
Check if the authentication method (e.g., Basic, OAuth, Bearer Token) required by the API or resource is correctly implemented in the request header.
Verify that the account associated with the credentials has sufficient permissions to access the requested resource.
Confirm that the authentication credentials have not expired or been revoked, and renew or update them if necessary.

# Response example 
HTTP/1.1 401 Unauthorized
Content-Type: text/xml
WWW-Authenticate: Basic realm="Access to the staging site"



401
Unauthorized: Access is denied due to invalid credentials.

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Common scraping HTTP error codes

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