[webkit-dev] X-Purpose, again!

Dan Bernstein mitz at apple.com
Mon Oct 11 21:20:23 PDT 2010

On Oct 9, 2010, at 7:11 AM, Gavin Peters (蓋文彼德斯) wrote:

> On 8 October 2010 12:02, Dan Bernstein <mitz at apple.com> wrote:
> On Oct 8, 2010, at 6:26 AM, Gavin Peters (蓋文彼德斯) wrote:
>> In particular, Safari sends "X-Purpose: preview" headers on requests for resources and subresources motivated by the previw feature of Safari.
> That’s incorrect. The header is only present in the request for the main resource.
> Thanks for the correction.
> Can you tell me why that decision was made?

This enables cached subresources to be shared between normal loading of pages and loading for preview purposes.
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