Error 4xx
This series mainly addresses errors occurring on the client side.
• Bad request- 400

• Unauthorized- 401

• Forbidden- 403

• Not found -404

• Conflict-409

• Unsupported media type-415

Error 5xx
A. This series mainly addresses errors occurring on server side.

B. Internal Server Error-500

C. Not implemented-501

D. Bad Gateway-502

E. Service unavailable-503

F. Gateway timeout-504