Forum Discussion

Mayank_Shukla's avatar
Mayank_Shukla
Icon for Altostratus rankAltostratus
Feb 23, 2017

http health monitor

Need to understand how http monitor works with respect to send and receive strings and what configuration is needed at the server end to ensure health check is successful.   Please advise ..  
application delivery
BIG-IP
LTM
DevBabu's avatar
DevBabu
Icon for Cirrus rankCirrus
Feb 23, 2017

HTTP monitor basically works by probing to a file in the server/application.

 

For example. If the server has a file named probecheck.html and we need to check if the server is good at serving the page. Send string will be:

 

I am assuming using HTTP/1.1

 

GET /probecheck.html HTTP/1.1\r\nHost:host.domain.com\r\nConnection:Close\r\n\r\n

 

If we just wan to check the page exist i.e. we can look for 200 OK back from the servr.

 

Receive: HTTP/1.1 200 OK

 

If we want to check some text written on the page/file for example probecheck.html has a text ON then we can have a receive string as:

 

Receive: ON

 

More information on HTTP monitor: https://support.f5.com/csp/article/K13397