Thanks again.

This worked in case anyone is looking for it:

http protocol "monit" {
    match request forward to <httpd>
    match request header "Host" value "status.affekt.org" forward to <monit>
}

The order is important, if put in reversed the "status.affekt.org"
forward will be overwritten.

Now all I need to investigate is why HTTP responses are erroneous,
though you might be right that it could be a Monit problem.

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