HTTP Response Codes

1xx: Informational: Request received, continuing process.
2xx: Success: The action was successfully received, understood, and accepted. 200 is the status code received most often.
3xx: Redirection: Further action must be taken to complete request.
4xx: User-Agent Error: The request contains bad syntax or cannot be fulfilled.
- 401: You are not authorized to make this request.
- 404: Cannot find the requested URL.
- 405: The HTTP method is not supported by the URL.
5xx: Server Error: The server failed to fulfill an apparently valid request.
- 500: Internal Server Error. Could see this if servlet throws an exception.