How to create standard Custom http monitor

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You can try below send string and test.

GET /path HTTP/1.1\r\nHost: host\r\nConnection: Close\r\n\r\n

Here in place of path and host, you need to put your actual application path and IP address of the backend server as given below. Under receive string mention simply 200.

GET /xyz HTTP/1.1\r\nHost: 10.10.10.10\r\nConnection: Close\r\n\r\n

Here, 10.10.10.10 is considered as backend server IP and /xyz is the application path.

Also before configuring this, make sure the application path is reachable from F5. You can test it using CURL command. If it is reachable, above custom send string should work as expected.

Hope it helps!