HTTP Status Codes

HTTP status codes the server can generate in response to an HTTP POST or HTTP GET request:

  • 200 OK: Successful request.
  • 400 Bad Request: Invalid argument (invalid request payload).
  • 403 Forbidden: Permission denied (e.g. invalid API key).
  • 429 Resource Exhausted: Either out of resource quota or reaching rate limiting.
  • 500 Internal Server Error: Internal server error (retry your request).
  • 503 Service Unavailable: Unavailable.
  • 504 Gateway Timeout: Deadline exceeded (retry your request).

Note: Clients that receive an unsuccessful HTTP response (that is, any HTTP status code other than 200 OK) must enter back-off mode.

Possible reasons for receiving HTTP status code 400 Bad Request: