RFC 1808 ——URL定義

地址：http://www.w3.org/Addressing/rfc1808.txt

RFC 1808           Relative Uniform Resource Locators          June 1995

格式：      <scheme>://<net_loc>/<path>;<params>?<query>#<fragment>

each of which, except <scheme>, may be absent from a particular URL.   These components are defined as follows (a complete BNF is provided   in Section 2.2):      scheme ":"   ::= scheme name, as per Section 2.1 of RFC 1738 [2].      "//" net_loc ::= network location and login information, as per                       Section 3.1 of RFC 1738 [2].      "/" path     ::= URL path, as per Section 3.1 of RFC 1738 [2].      ";" params   ::= object parameters (e.g., ";type=a" as in                       Section 3.2.2 of RFC 1738 [2]).      "?" query    ::= query information, as per Section 3.3 of                       RFC 1738 [2].      "#" fragment ::= fragment identifier.