Hi, I'm starting hacking at adding support for the Link: http header. This is described in RFC 2068, although not RFC 2616. As well, there's a current internet draft describing it: http://tools.ietf.org/id/draft-nottingham-http-link-header-10.html . This header is being discussed in the IETF HTTP WG mailing list. Since it was in HTTP 1.1 as first published, it is reserved, and legal to use today for this purpose.
The HTTP Link header should be treated nearly identically to an HTML Link element. This means that guidance for stylesheet, subresource & stylesheet loading can be provided to a browser before any parse of HTML has been started. Possibly a win. Right now, Leon Clarke has a patch he's landing for the link rel=prefetch case in HTML, see https://bugs.webkit.org/show_bug.cgi?id=3652 . I'd like to code this up for headers as well. At first, I'd like to take a relatively simpleminded approach. I don't want to carry forward DOM implications of the HTTP header (i.e. i'll ignore an onload attribute), and I don't think I'll share much code with HTMLLinkElement.cpp. However, I'm open to feedback on this. I intend to catch a few simple rel cases (subresource, prefetch & stylesheet) and launch appropriately prioritized resource requests. Any thoughts? - Gavin
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