MONITORS THAT IDENTIFIES A SPECIFIC KEYWORD SOMEWHERE WITHIN AN HTML REPORT PAGE TO MARK IT UP

Would that page "/ha/UpServer.html" ever give you a '200 OK' but server a different response ? ... ie something other than ABCDEF=host1234 ?

If not the cant you just look for the 200 OK ?

Or if you have the ability to tweak the page html on "/ha/UpServer.html" maybe try removing the "=" sign or looking for the equal sign in the response. My thoughts are that the equal sign might need special escaping (not sure?)