How Do I Handle Abnormal Request Headers?

In addition to abnormal status codes, ELB notifies clients of typical exceptions through the x-router-code header. Common header values are 40000, 40001, 50000, and 50001. You can handle these headers based on the following table.

Table 1 Abnormal headers
Header Value	Meaning	Possible Causes
40000	The default backend server group has no backend servers.	The client request does not match any forwarding policy. No backend server is configured for the backend server groups.
40001	The backend server group of the matched forwarding policy has no backend servers.	An unexpected forwarding policy is matched by accident. The backend server group of the matched forwarding policy has no backend servers.
50000	All backend servers are unavailable.	The health check is not correctly configured. As a result, ELB considers that all backend servers are unhealthy. All backend servers themselves are unavailable.
50001	The configuration is loading.	The configuration is not complete. Wait and try again later.

Parent topic: Service Abnormality

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