[wp-trac] [WordPress Trac] #23021: Last-Modified header always set to 1970... when it is blank. Make browser cannot refresh cache.

[WordPress Trac]

#23021: Last-Modified header always set to 1970... when it is blank. Make browser
cannot refresh cache.
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 Reporter:  slene         |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  3.5.1
Component:  General       |     Version:  3.5
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |
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Comment (by nacin):

 [attachment:23021.4.diff]'s $nocache_headers variable causes a legitimate
 Last-Modified header to be removed from feeds, when the user is logged in.

 Because it is a feed, I imagine always having a header here is by design,
 even in a no-cache situation. I could see arguments either way, though.

 $nocache_headers is really just an enhancement to further avoid tampering
 by plugins, but we should probably avoid going near that in a point
 release. Also, since in PHP 5.2 we'd now be looping through headers_list()
 on every request (as we normally ''don't'' send Last-Modified, not just in
 no-cache situations), I adopted the `false` from wp_header(). See
 [attachment:23021.6.diff].

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Ticket URL: <http://core.trac.wordpress.org/ticket/23021#comment:16>
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