ISSUE-193
HTML served to browser even when RDF is explicitely requested in the Accept header
- State:
- RAISED
- Product:
- Recipes
- Raised by:
- Diego Berrueta
- Opened on:
- 2009-04-06
- Description:
Firstly reported by Antoine Issac, 12/Feb/2009: [[[ Related to getting the SKOS RDF file by it default URI (or at least to test that ability), I wanted to change my browser's headers so that it asks for RDF data and not HTML anymore. Following Sean's advice, I have installed the ModifyHeader plug-in for Firefox (I'm still at version 2.0). I now have the following problem. I have changed the Accept header sent by my Firefox to application/rdf+xml (only) On dbPedia, when it queries [1] , Firefox gets redirected to the RDF file [2]. Perfect! But when it queries for the SKOS 2008 file [3], Firefox gets redirected to [4] and not to [5]. How come? What is puzzling is that Vapour [6] reports that everything is ok with both URIs [1] and [3], even though the behaviours differ when there is no content negociation. Interestingly, Vapour itself recognizes my Accept headers: when I activate the application/rdf+xml only, it sends its reports in RDF, while it sends the HTML if I do nothing. Is there something more than Accept header involved? Has my plug-in bugs, or am I just too dumb to think of myself playing with that kind of stuff? Thanks for any feedback, Antoine [1] http://dbpedia.org/resource/William_Shakespeare [2] http://dbpedia.org/data/William_Shakespeare.rdf [3] http://www.w3.org/2008/05/skos [4] http://www.w3.org/TR/2008/WD-skos-reference-20080829/skos.html [5] http://www.w3.org/TR/2008/WD-skos-reference-20080829/skos.rdf [6] http://validator.linkeddata.org/ ======================== http://www.w3.org/2008/05/skos GET /2008/05/skos HTTP/1.1 Host: www.w3.org User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:1.8.1.20) Gecko/20081217 Firefox/2.0.0.20 Accept: application/rdf+xml Accept-Language: fr,en-us;q=0.8,fr-fr;q=0.5,en;q=0.3 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive HTTP/1.x 303 See Other Date: Thu, 12 Feb 2009 15:13:21 GMT Server: Apache/2 Location: http://www.w3.org/TR/2008/WD-skos-reference-20080829/skos.html Cache-Control: max-age=21600 Expires: Thu, 12 Feb 2009 21:13:21 GMT Content-Length: 269 Connection: close Content-Type: text/html; charset=iso-8859-1 ]]] ( http://lists.w3.org/Archives/Public/public-swd-wg/2009Feb/0034.html ) The relevance of the User-Agent header was later identified by Diego Berrueta and Sergio Fernandez, 13/Feb/2009: [[[ This problem is a nice example of the risks of using the User-Agent header for content negotiation. The server is issuing a redirect to the HTML document when you use Firefox/IE, regardless of the content of the Accept header. Compare these two requests: $ curl -I -H "Accept: application/rdf+xml" http://www.w3.org/2008/05/skos HTTP/1.1 303 See Other ... Location: http://www.w3.org/TR/2008/WD-skos-reference-20080829/skos.rdf ... $ curl -I -H "Accept: application/rdf+xml" -H "User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.6) Gecko/2009020409 Iceweasel/3.0.6 (Debian-3.0.6-1)" http://www.w3.org/2008/05/skos HTTP/1.1 303 See Other ... Location: http://www.w3.org/TR/2008/WD-skos-reference-20080829/skos.html ... Best, (Thanks to Sergio, in CC, for the HTTP traces) ]]] ( http://lists.w3.org/Archives/Public/public-swd-wg/2009Feb/0041.html )
- Related emails:
- ISSUE-193: HTML served to browser even when RDF is explicitely requested in the Accept header (from dean+cgi@w3.org on 2009-04-06)
- [Recipes] new editors' draft (proposed solution to ISSUE-193) (from diego.berrueta@fundacionctic.org on 2009-04-07)
- Re: [Recipes] new editors' draft (proposed solution to ISSUE-193) (from tbaker@tbaker.de on 2009-04-21)
- Re: [Recipes] new editors' draft (proposed solution to ISSUE-193) (from tbaker@tbaker.de on 2009-04-21)
- meeting record: 2009-04-21 SemWeb Deployment WG telecon (from swick@w3.org on 2009-04-21)
- Re: [Recipes] new editors' draft (proposed solution to ISSUE-193) (from diego.berrueta@fundacionctic.org on 2009-04-30)
Related notes:
No additional notes.