url-formats

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Revision as of 23:35, 21 August 2011 by Tantek (talk | contribs) (added HTTP URL syntax list of parts of the URL)
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<entry-title>URL formats</entry-title>

URLs are often defined and represented in various systems as a set of various pieces/parts. This page documents the implicit formats from those systems.

URL specification

The URL specification is perhaps the most canonical source for the names of the different parts of a URL.

1994 http://www.w3.org/Addressing/URL/url-spec.txt

Names are quoted literally, dropping any "The" prefix and "part" suffix.

  • PrePrefix - e.g. "URL:". The portion before the "http".
  • Scheme - e.g. "http"
  • :
  • Internet protocol parts
    • // (until the following /)
    • user name (if present, followed by an @ after optional password (see next field)).
    • password (if present, preceded by a :)
    • internet domain name - e.g. "www.w3.org"
    • port number (if present, preceded by a :)
  • Path
    • search
  • fragmentid - "the hash sign and following"

HTTP

The HTTP specification has a few notes about the format/portions of HTTP URLs.

1996 http://www.ietf.org/rfc/rfc1945.txt - 3.2.1 General Syntax

  • URI
    • absoluteURI
      • scheme
      • :
      • relativeURI
        • net_path
          • //
          • net_loc
          • abs_path
            • /
            • rel_path
              • path
                • fsegment
                • segment (zero or more, if present, preceded by /)
              • params (if present, preceded by ;)
              • query (if present, preceded by ?)
    • fragment (if present, preceded by #)

Also:

  • http_URL
    • http://
    • host
    • port (if present, preceded by :)
    • abs_path (as defined above)

Canonicalization:

  • host is lowercased
  • :port is omitted if the port is 80
  • empty abs_path is replaced with /

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