Ok, so I will continue investigating
Thanks a lot for your reply,
Juliana
2011/3/12 Richard Cyganiak <[email protected]>
> Hi Juliana,
>
> On 12 Mar 2011, at 00:20, Juliana wrote:
> > To know that that time has past Virtuoso reads HTTP headers and uses the
> "Date", "ETag", "Expires", "Last-Modified",
> > "Cache-Control" and "Pragma: no-cache" fields to calculate when the
> resource should be reloaded.
> >
> > The problem I'm having is that data is always got from cache, and I think
> this happens because one or more of these tags are missing
> > in the http header of D2R response.
>
> Here's the header of a typical D2R SPARQL response:
>
> HTTP/1.1 200 OK
> Date: Sat, 12 Mar 2011 18:12:58 GMT
> Server: Jetty(6.1.10)
> Cache-Control: no-cache
> Pragma: no-cache
> X-Joseki-Server: Joseki-3.2
> Content-Type: application/sparql-results+xml
>
> So the only headers not present are ETag, Expires and Last-Modified. To
> send these headers one would have to know when the relevant records in the
> DB have been last changed, and when they are likely to change next (for
> Expires). D2R has no knowledge of that, so it can't set those headers.
>
> Note in particular the presence of the various no-cache values, which
> actually indicate that query responses should not be cached.
>
> So I'm not convinced that there's anything that we can change in D2R to
> resolve your issue.
>
> Best,
> Richard
>
>
> > So, what I would like to ask you is if there is a way to force that the
> response given by D2R includes these properties in the header,
> > so that updated data can be got after the specified time has past.
> >
> > Thank you very much.
> >
> > Regards,
> > Juliana Quiñones
> >
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