A BIG-IP Administrator assigns the default http health monitor to a pool that has three...

The behavior of a health monitor is determined by itsSend StringandReceive String.

Default HTTP Monitor:The pre-configured default HTTP monitor on a BIG-IP system has an emptyReceive String.

Success Criteria:When the Receive String is blank, the BIG-IP system considers the health check successful if it receivesany valid HTTP responsefrom the server.

Status Code Interpretation:Because a 404 Not Found is a valid HTTP status code (it is a properly formatted response from a running web server process), the BIG-IP interprets this as the application being "alive".

Result:All three members (including the two returning 404s and the one returning 200) will be marked asUP/Available(Green).