"ref-RFC2119">RFC2119</a>]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", <a href="./bcp14">BCP 14</a>, <a href="./rfc2119">RFC 2119</a>, March 1997.

   [<a name="ref-RFC3986" id="ref-RFC3986">RFC3986</a>]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66,
              <a href="./rfc3986">RFC 3986</a>, January 2005.

   [<a name="ref-RFC7230" id="ref-RFC7230">RFC7230</a>]  Fielding, R., Ed. an