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Check DomainFront (chkdfront) - A tool verifies domain fronting.

$ gem install chkdfront

Help menu:
    -f, --front-target URL           Fronted target domain or URL.
                                     	e.g. images.businessweek.com
    -d, --domain-front DOMAIN        DomainFront domain.
                                     	e.g. df36z1umwj2fze.cloudfront.net
    -e, --expect STRING              Expect a given string that indicates success. (case-sensitive)
                                     	e.g. It works
    -p, --provider NUM               Choose CDN / Domain Front Provider:
                                     	[0] Auto    (default - auto tune request. Extra request to detect)
                                     	[1] Amazon  (tune request for Amazon domain fronting)
                                     	[2] Azure   (tune request for Azure domain fronting)
                                     	[3] Alibaba (tune request for Alibaba domain fronting)
    -t, --troubleshoot [DOMAIN]      Force troubleshooting procedures.
                                     execute troubleshooting procedures(ping, http, nslookup) for all parties
                                     (optional: original domain where CDN forwards, to include in the checks)
                                     	e.g. c2.mydomain.com
        --proxy USER:PASS@HOST:PORT  Use proxy settings if you're behind proxy.
                                     	e.g. user1:Pass123@localhost:8080
        --debug                      Force debugging.
                                     show response's body and low-level request and response debug trace.
                                     (default enabled when test fails.)
    -h, --help                       Show this message.

Usage:
  /usr/local/bin/chkdfront <OPTIONS>
Example:
  /usr/local/bin/chkdfront -f images.businessweek.com -d df36z1umwj2fze.cloudfront.net
  /usr/local/bin/chkdfront -f images.businessweek.com -d df36z1umwj2fze.cloudfront.net --debug -t c2.mysite.com