Remove incorrect checking of DocType DTD URIs #63
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For a brief time (some decades), the DTD URIs found in DocType declarations could be interpreted as URLs. This is no longer the case since the W3C has removed the resources at those locations (e.g. http://www.w3.org/TR/html4/strict.dtd no longer returns 200). The link-checker should not attempt to check DTD URIs, since they are identifiers, not necessarily locations.
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Background on the recent changes to w3.org and DTD URIs: https://www.w3.org/blog/2022/07/redirecting-to-https-on-www-w3-org/ |
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For a brief time (some decades), the DTD URIs found in DocType declarations could be interpreted as URLs. This is no longer the case since the W3C has removed the resources at those locations (e.g. http://www.w3.org/TR/html4/strict.dtd no longer returns 200). The link-checker should not attempt to check DTD URIs, since they are identifiers, not necessarily locations.