HTTP Response Codes

200Request succeeded
400Error parsing request
401Invalid or missing API key
403Access denied for a valid API key
405Wrong HTTP method
422Request body did not match schema
429Too many requests received
451Wrong key type was used (server-side key used from the client-side or client-side key used from the server-side)
499Client closed connection (while the server is still processing the request)
Note: If you receive 499 errors for only a low percentage of calls, this is part of the statistical expectancy when dealing with a large number of network calls.
500Unspecified internal error