Length of Identity URL

Brad Fitzpatrick brad at danga.com
Tue May 24 17:20:00 PDT 2005

Let's go with:

-- identity URL:  255 max

-- identity server URL:  2047 max, after consumer-added arguments

-- return_to URL:  2047 max, after identity-server added arguments


On Tue, 24 May 2005, Martin Atkins wrote:

> I'm currently working on a simple OpenID consumer app as a test, and
> have as a result created a database table to retain known users and
> their profile information.
> I'm allocating a 50-character VARCHAR field for storing the Identity
> URL, but it occurs to me that a URL can theoretically be of any length.
> I think then that the spec should give a recommended maximum URL length
> after which consumers are allowed to reject the URL. Users who try to
> assert longer URLs must then be prepared for it to fail in some cases.
> I just picked 50 arbitrarily. I welcome discussion on what a good value
> would be. Currently we've only LiveJournal's URLs to work with as an
> example, and these have a maximum length of 39 characters. The
> modestly-named GreatestJournal could theoretically push that up to 43 if
> it upgrades to support OpenID. (I'm assuming storing the URL in
> canonical form with a 15-character username)
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