This filter is responsible for setting the HTTP status code on response
messages. This enables the administrator to ensure that a more meaningful
response is sent to the client in the case of an error or anomaly
occurring in a configured policy.
For example, if a Relative Path filter failed, it may be useful
to return a 503 Service Unavailable response. Similarly, if a user
does not present identity credentials when attempting to access a protected resource,
you can configure the Enterprise Gateway to return a 401 Unauthorized response
to the client.
HTTP status codes are returned in the status-line of
an HTTP response. The following are some typical examples:
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HTTP/1.1 200 OK
HTTP/1.1 400 Bad Request
HTTP/1.1 500 Internal Server Error
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