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25151b14e7
This loosens the ‘is this localhost?’ check to include *.localhost host names. This allows for clearer (hence better) names to be used in browsers, e.g. when accessing a remote syncthing instance ‘foo’ using a ssh port forward, one can use foo.localhost to remind oneself which one is which. 💡 Without these changes, Syncthing shows a ‘Host check error’ when pointing a browser at http://foo.localhost/, and with these changes, the interface loads as usual. The .localhost top level domain is a reserved top-level domain (RFC 2606): > The ".localhost" TLD has traditionally been statically defined in > host DNS implementations as having an A record pointing to the > loop back IP address and is reserved for such use. Any other use > would conflict with widely deployed code which assumes this use. > – https://tools.ietf.org/html/rfc2606 As Wikipedia puts it: > This allows the use of these names for either documentation purposes or in local testing scenarios. – https://en.wikipedia.org/wiki/.localhost On Linux systems, systemd-resolved resolves *.localhost, on purpose: https://www.freedesktop.org/software/systemd/man/systemd-resolved.service.html See also #4815, #4816.