Pls help-> health monitor for each website

Hi, I configured as following:

 

 

http_monitotor1

 

 

send string:

 

 

GET /index.html HTTP/1.1\r\nHost: www.abc1.com\r\nConnection: close\r\n

 

 

receive string:

 

 

200 OK

 

 

and http_monitotor2

 

end string:

 

 

GET /index.html HTTP/1.1\r\nHost: www.abc2.com\r\nConnection: close\r\n

 

 

receive string:

 

 

200 OK

 

 

and assigned it to pool, it is Ok-> it let me know members pool worked well

 

But I wonder that how can I recognize on BIG-IP LTM one Website down or not? Can I recognize it on BIG-IP ? thanks for your help.