Apparently, Tor hidden services can detect proxies such as Tor2Web:

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How can hidden services do this? What is the exact process they use to detect these proxies?

Image source: https://www.howtogeek.com/272049/how-to-access-.onion-sites-also-known-as-tor-hidden-services/.

  • Maybe Tor2web doesn't modify the HTTP request hostname as it proxies the request, then the onion service can see the request is for the wrong website ("facebook...onion.to" and not "facebook...onion")?
    – Steve
    Apr 24 at 19:52

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