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From WHATWG Wiki
Revision as of 10:39, 11 February 2013 by Annevk (talk | contribs) (add some stuff on the model)
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Fetch is fetch.spec.whatwg.org and will define HTML fetch and CORS as a set of coherent algorithms rather than the intertwined mess we have now. It will also deal with the following:

  • Deal with authentication (URLs containing username/password, servers responding with 401)
  • Deal with URL processing
  • Define HTTP context for data: URLs, about:blank, and file: URLs.
  • Progress Events


The basic model is Request -> Fetch -> Response.


  • URL (as object)
  • method
  • UA headers
  • author headers (maybe rename because people get upset with "author")
  • entity body
  • origin
  • manual redirect flag
  • omit credentials flag
  • force preflight flag (set for upload progress notifications (to not reveal existence of server in case of POST I suppose; I should know...))

XXX add CORS modes and whatever HTML fetch defines.


Have a case-switch on URL scheme. See also URL. Fetch results in a network error response unless the scheme is one of

  • http
  • https
  • ftp
  • file
  • about
  • data
  • blob

CORS stuff is only relevant for http/https. Can be relevant even for same-origin requests in case of cross-origin redirect without the manual redirect flag set.

XXX ...


Both intermediate updates (progress, headers received, ...) and final. Also indicates network error / CORS error (exposed as network error), ...