Per the RFC, as a HTTP/1.1 proxy, Fiddler is required
to add a Host header.
It's not clear why this is problematic-- any server that has a problem with this is, by definition, buggy and should be fixed.
You can remove the header if you'd like (although doing so can cause problems elsewhere). Click Rules > Customize Rules. Scroll to OnBeforeRequest
and add the following:
if (oSession.oRequest.headers.HTTPVersion == "HTTP/1.0")
oSession["x-overridehost"] = oSession.host;
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