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HTTP statuses

What to return if request params are incorrect?

400 - is the generic client-side error status, used when no other 4xx error code is appropriate.

Server does not undesrstand the content type (requires JSON).

415 - Unsupported Media Type.

Server understand the content type

but was unable to process the contained instructions.

422 (Unprocessable Entity).

2×× Success

200 OK
201 Created
202 Accepted

3×× Redirection

301 Moved Permanently
302 Found
304 Not Modified
308 Permanent Redirect

4×× Client Error

400 Bad Request
401 Unauthorized
403 Forbidden
404 Not Found
405 Method Not Allowed
406 Not Acceptable
408 Request Timeout
409 Conflict
410 Gone

5×× Server Error

500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout
507 Insufficient Storage
511 Network Authentication Required
599 Network Connect Timeout Error

HTTP status ranges in a nutshell

1xx: hold on
2xx: here you go
3xx: go away
4xx: you fucked up
5xx: I fucked up