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https://datatracker.ietf.org/doc/html/rfc2111
RFC 2111 - Content-ID and Message-ID Uniform Resource Locators
Content-ID and Message-ID Uniform Resource Locators (RFC 2111, ; obsoleted by RFC 2392)
uniform resource locatorscontent idrfc2111message
https://datatracker.ietf.org/doc/html/rfc1738.html
RFC 1738 - Uniform Resource Locators (URL)
Uniform Resource Locators (URL) (RFC 1738, ; obsoleted by RFC 4266, RFC 4248)
uniform resource locatorsrfc1738url
https://datatracker.ietf.org/doc/html/rfc1808
RFC 1808 - Relative Uniform Resource Locators
Relative Uniform Resource Locators (RFC 1808, ; obsoleted by RFC 3986)
uniform resource locatorsrfc1808relative