Add error status response handling

[jayaddison]

Is your feature request related to a problem? Please describe.
Currently the API request and response handling code assumes success; there's no checking of HTTP status codes, for example, and no handling of the various exceptions that can occur.

Describe the solution you'd like
We should add error handling for a realistic set of foreseeable error conditions, including but not limited to invalid API key credentials, unknown server errors, timeouts, rate limiting, and inability to connect to the server.

Describe alternatives you've considered
N/A

Additional context
N/A