Simon Willison’s Weblog

9 items tagged “revcanonical”

We did some studies and found that the attribute was almost never used, and most of the time, when it was used, it was a typo where someone meant to write rel=“” but wrote rev=“”. To be precise, the most commonly used value was rev=“made”, which is equivalent to rel=“author” and thus was not a convincing use case. The second most common value was rev=“stylesheet”, which is meaningless and obviously meant to be rel=“stylesheet”.

Ian Hickson # 14th April 2009, 4:34 pm

Counting the ways that rev=“canonical” hurts the Web. Mark Nottingham complains about misapplied trust (a page can falsely claim to be the canonical URL for another page), the easy confusion between rev and rel and the lack of discussion with relevant communities. # 14th April 2009, 2:11 pm

You guys are moving on this stuff too fast! Welcome to 2002, when lots of us had more spare time than employment and we deployed new crap like this on our blogs and sites daily.

Les Orchard # 14th April 2009, 8:57 am

I like rev=“canonical”. Les Orchard summarises the current debate over what colour to paint the rev=“canonical” bikeshed. # 13th April 2009, 10:41 am

django-shorturls. Jacob took my self-admittedly shonky shorter URL code and turned it in to a proper reusable Django application. # 13th April 2009, 9:31 am

We’re using the same trick on flic.kr to avoid having to maintain a look up database, though we’re using base 58.

Kellan Elliott-McCrea # 12th April 2009, 4 pm

A rev=“canonical” HTTP Header. Chris Shiflett proposes optionally exposing rev=canonical information in an HTTP header, thus allowing sites to discover shorter URLs using just a HEAD request and removing the need to parse HTML. The pingback specification also uses this shortcut. # 12th April 2009, 12:33 pm

Revving up. Jeremy Keith advocates adding the revcanonical attribute to regular A elements as well as / instead of hiding it in the head of the document, following the microformats design principle that invisible metadata is less valuable than augmenting visible links. I’ve updated my shorten bookmarklet to handle this case. # 12th April 2009, 12:29 pm

rev=canonical bookmarklet and designing shorter URLs

I’ve watched the proliferation of URL shortening services over the past year with a certain amount of dismay. I care about the health of the web and try to ensure that URLs I am responsible will last for as long as possible, and I think it’s very unlikely that all of these new services will still be around in twenty years time. Last month I suggested that the Internet Archive start mirroring redirect databases, and last week I was pleased to hear that Archiveteam, a different organisation, had already started crawling.

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