What are the CLB error codes?

The error codes of CLB basically follow the HTTP standards.

Client errors, return 4XX

• 400 Bad request: Your browser sent an invalid request.
• 403 Forbidden: Request forbidden by administrative rules.
• 408 Request Time-out: Your browser didn’t send a complete request in time.

Server errors, return 5XX

• 500 Server Error: An internal server error occured.
• 502 Bad Gateway: The server returned an invalid or incomplete response.
• 503 Service Unavailable: No server is available to handle this request.
• 504 Gateway Time-out: The server didn’t respond in time.