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while http://validator.w3.org/check?uri=https//mydomain/index_en.html works nicely as per bug 77, when doing "http://validator.w3.org/check/referer" from https://mydomain:8443/privaLope/index_en.jsp, I get " Sorry, this type of URI scheme (undefined) is not supported by this service. Please check that you entered the URI correctly."
no clue whether this is really an SSL problem, but now with the above URL, I get <<CSS Validator Error Target: https://bugs.privasphere.com:8443/index_en.jsp java.lang.Exception: Unknown file >> P.S.: hope this would also be working with HTTP AUTH as per Bug 122
See <http://validator.w3.org/docs/help.html#faq-referer>, your browser does not send a Referer: header which it likely does for SSL documents, you should specify the full URI in the parameter, otherwise it won't work.