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https://stackoverflow.com/questions/1959947/whats-an-appropriate-http-status-code-to-return-by-a-rest-api-service-for-a-val
https://stackoverflow.com/questions/32752578/whats-the-appropriate-http-status-code-to-return-if-a-user-tries-logging-in-wit/32752617
https://www.restapitutorial.com/httpstatuscodes.html
https://developer.mozilla.org/en-US/docs/Web/HTTP/Status
https://github.com/meanjs/mean/issues/1218
https://core.trac.wordpress.org/ticket/25446
https://de.wikipedia.org/wiki/HTTP-Statuscode
https://developer.here.com/documentation/routing/topics/http-status-codes.html
https://www.myintervals.com/api/errors.php
https://docs.telerik.com/platform/backend-services/javascript/apireference/RESTfulAPI/error_codes.html
https://www.addedbytes.com/blog/http-status-codes/
https://softwareengineering.stackexchange.com/questions/330499/good-practice-for-status-code-returned-by-restful-api-when-validating-a-token
https://airbrake.io/blog/http-errors/401-unauthorized-error