HTTP Response Codes

Code	Meaning
200	Request succeeded
400	Error parsing request
401	Invalid or missing API key
403	Access denied for a valid API key
405	Wrong HTTP method
422	Request body did not match schema
429	Too many requests received
451	Wrong key type was used (server-side key used from the client-side or client-side key used from the server-side)
499	Client 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.
500	Unspecified internal error