Layer 7 L7 probe on F5 LTM

Create custom HTTPS monitoring in F5 to monitor the page. Below command will help you to configure but basic troubleshooting needed per requirement.

# create ltm monitor https monitor_custom_https { defaults-from /Common/https send "GET /index.html HTTP/1.1\r\nHost: lriczupaswhd001.nam.pwcinternal.com\r\nConnection: Close\r\n\r\n" recv 200 }
 
Below will be output after monitor creatation. 
==
ltm monitor https monitor_custom_https {
    adaptive disabled
    defaults-from https
    destination *:*
    interval 5
    ip-dscp 0
    recv 200  # Change the string per requirements.
    recv-disable none
    send "GET /index.html HTTP/1.1\r\nHost: lriczupaswhd001.nam.pwcinternal.com\r\nConnection: Close\r\n\r\n"
    time-until-up 0
    timeout 16
}

. This is just an reference. https://support.f5.com/csp/article/K12531