This memo defines a new access-type for message/external-body MIME parts for Uniform Resource Locators (URLs). URLs provide schemes to access external objects via a growing number of protocols@ including HTTP@ Gopher@ and TELNET. An initial set of URL schemes are defined in RFC 1738.
RFC 2017-1996 history
1996RFC 2017-1996 Definition of the URL MIME External-Body Access-Type