[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 azaozz):

 Yeah, what's the point in setting an empty `Last-Modified` header and then
 unsetting it. Also bear in mind that the web server sits between PHP and
 the client, so it can add/remove/change any header no matter what we do in
 PHP depending on its settings.

 Thinking we should remove `Last-Modified` from `wp_get_nocache_headers()`
 and leave it at that. If a plugin uses the filter to set it back, it may
 have a good reason to do this, we shouldn't limit/overwrite it.

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Ticket URL: <http://core.trac.wordpress.org/ticket/23021#comment:6>
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