Failure conditions

The following failure conditions lead to failover

• ICAP request failed due to layer-3 failure (twice for the same request)
• Failure to connect to a port within a given timeout
• Failure to send request (server resetting connection, and similar)

Content Gateway does not consider missing, invalid, or slow responses as failures.

Content Gateway does, however, verify that the ICAP server is valid at startup by verifying the response to the ICAP OPTIONS request.