[xep-support] Image access when generating PDF

[Hood, Earl]

> If an Expires field is set (to a reasonable value), XEP will get an 
> image just once. Otherwise, if the image was not modified on 
> the server, 
> XEP will get it once and check it was not modified twice (200 
> 304 304).

Just curious: Why would XEP care if the graphic has been modified?
What is the time critical problem that XEP is addressing for it
to check if a graphic file has been modified in the middle of
processing?

Is the HTTP behavior a mirror of local file system behavior?  I.e.  Does
XEP do multiple stats on a local file to see if it has been modified
before processing is complete?

--ewh

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