When REST API requests are sent to carry out various actions, various HTTP status codes will be returned based on the state of the action (success or failure) and the HTTP method (POST, GET, PUT, DELETE) executed. The following are the definitions of the various HTTP status codes that are returned.
Requested resource not found. Generally used as a response for unsuccessful GET and PUT REST API HTTP methods.
Request could not be processed because of conflict in the request. This generally occurs when you are trying to add a resource that already exists. For example, when trying to add an auto-scaling policy that has an already existing ID.