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API Pagination limit

From: Karl Dubost <karld@opera.com>
Date: Thu, 14 Jul 2011 11:29:52 -0400
Message-Id: <43A715E2-14AB-4229-810C-84078E1189C9@opera.com>
Cc: Jon Masse <jmasse@pheromone.ca>
To: httpbis Group <ietf-http-wg@w3.org>

About API and too large response limit.
Jon Masse (cced) asked me a question about API and the right HTTP Code to send back to the client. 

Creating an API returning N posts starting at an index x
with a limit of N <= 500.

Someone sends an HTTP GET with n=1000

    GET /post?start=1&n=1000 HTTP/1.1
    Host: api.example.org
    User-Agent: FooBar v1
    Accept: application/json

What should the API developer send back?

* 200 OK and a Link for the pagination?
  Link: </post?start=500&n=500>; rel="Next"
  (but the client might not know it used an out of range value

* a 4xx to communicate that there is an out of range value?
  (but which 4xx? It doesn't seem there is one appropriate.
  403 doesn't seem right)


Karl Dubost - http://dev.opera.com/
Developer Relations & Tools, Opera Software
Received on Thursday, 14 July 2011 15:30:30 UTC

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