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The agent provides two methods to evaluate the state of an Apache HTTP server instance. The first state check is mandatory and the second is optional.
The first check determines the state of the Apache HTTP server by searching for the existence of the parent httpd daemon and for at least one child httpd daemon. If the parent process and at least one child do not exist, VCS reports the resource as offline. If they do exist, and if the agent attribute SecondLevelMonitor is set to true, then a socket connection is established with the Apache HTTP server using the values specified by agent attributes Host and Port. Once connected, the agent issues an HTTP request to the server to test its ability to respond. If the HTTP Server responds with a return code between 0 and 408, the agent considers the server online. If the server fails to respond or returns any other code, the agent considers the server offline.