Help http health monitor

Your send string, "GET / HTTP / 1.1 \ r \ nHost: test1.example.com; test2@example.com; test3@example.com \ r \ nConnection: Close \ r \ n \ r \ n" violates RFC, you can have only one host in a host header. In this situation I can only assume your server interprets the value of the host header as one long string "test1.example.com; test2@example.com; test3@example.com" instead of your intention of 3 unique values.

Do your servers strictly require a value for the Host header? RFC states that it can be a null (empty) value so if all your servers do not strictly require a value then just leave it empty. If they do require a strict value then you will need to create multiple monitors and apply them to each pool member individually as required.

"GET / HTTP / 1.1 \ r \ nHost:\ r \ nConnection: Close \ r \ n \ r \ n"