How to create standard Custom http monitor

 , did you checked the below article? It covers almost all the required details.

https://support.f5.com/csp/article/K2167

Yes I checked that and I applied moniter as well but didnt work

Below what i need , what should be the send & Receive string?

http://backend server ip:8580/xyz by calling this URL should get http response as 200.

 ,

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!

Hi  , Putting localhost will not help you as it won't resolve the backend IP of server IP from F5. Instead of using localhost, you can use FQDN of the backend server. Just need to make sure that FQDN is resolving IP from F5. Once this is configured, same custom send string will be mapped to all the backend pool members.

I just want to understand what localhost mean here?

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