CONNECT www.grendel-scan.com:443 HTTP/1.1 Host: demo.testfire.net Host: www.grendel-scan.com User-Agent: Mozilla/5.0 (compatible; Grendel-Scan; http://www.grendel-scan.com)
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Reproduction: default scan settings, any valid base URL.
In this case, the first Host: header must be removed IIRC.