Common HTTP status codes, their description and their place in a RESTful API

status_codes.md

HTTP Status Codes

2xx Success

200 OK

• The request has succeeded
• Routes:
  • GET index
  • GET show

201 Created

• The request has been fulfilled and resulted in a new resource
• Routes:
  • POST create

204 No Content

• The request has been fulfilled but the server does not need to return an entity-body
• Routes:
  • PUT update
  • DELETE destroy

4xx Client Error

400 Bad Request

• The request could not be understood due to malformed syntax
• Routes:
  • All routes

401 Unauthorized

• The request requires user authentication, the client may repeat the request with a suitable Authorization header
• Routes:
  • All routes

404 Not Found

• The server has not found anything matching the Request-URI
• Routes:
  • GET show
  • PUT update