~jeffpc/blahgd#5: 
Respect HTTP_IF_MODIFIED_SINCE

This has the potential of saving a lot of CPU time and network bandwidth.

Logged requests show a variety of values:

 name='HTTP_IF_MODIFIED_SINCE' type=9
     value=''
 name='HTTP_IF_MODIFIED_SINCE' type=9
     value='Tue, 20 Oct 2015 21:24:49 GMT'
 name='HTTP_IF_MODIFIED_SINCE' type=9
     value='Mon, 07 Sep 2015 07:31:05 UTC'
Status
REPORTED
Submitter
~jeffpc
Assigned to
No-one
Submitted
1 year, 8 months ago
Updated
1 year, 8 months ago
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