I wouldn't just let it default. It is better to probe for a particular page if that is possible. If this is a page you create, then it offers the possibility of being able to take a server out of rotation simply by renaming the page. E.g.
probe http PROBE-iamhere
passdetect interval 10
request method head url /serverhere.html
expect status 200 200
Alternatively, it looks like you are getting a 302 response code (a redirect) then you could just change the line in the probe to expect that.
I've ran into this issue with sites that require authentication or do not have a default web page configured. In a pinch and a short outage window, I've had probe TCP port 80 instead of doing a HTTP probe.
Cathy's reply may be the better route to go, since Cathy is an expert at this stuff and has answered many of my questions with her posts.
I'm going to try her method mentioned in this post the next time I run into this issue.
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