Http codes can be separated in 4 simple groups:

• codes for successful calls,

• calls redirected to new or moved URI,

• client and

• server side errors.

Success codes

200: OK

Default success code - Provides the requested resources (if any were requested)

201: CREATED

Default success code for creation - resource has been created successfully

Redirection codes

301: MOVED PERMANENTLY

This and all future requests will be redirected to the new destination

304: NOT MODIFIED

The resource has not been modified.

Client side errors

400: BAD REQUEST

Default Error Code - Used if an object has invalid parameters

401: UNAUTHORIZED

Current consumer is not authorized to access requested resource

404: NOT FOUND

Resource / Method / Route not found

Server side errors

500: INTERNAL SERVER ERROR

Default Error Code - Used if an exception occurs