[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 ryan):

 Testing results with 23021.4.diff.

 PHP 5.2.17:

 * Last-Modified is not sent when no plugin is adding Last-Modified.
 * Last-Modified is sent but empty when a plugin adds Last-Modified.

 PHP 5.3.14:

 * Last-Modified is not sent when no plugin is adding Last-Modified.
 * Last-Modified is not sent when a plugin adds Last-Modified.

 PHP 5.4.4 behaves the same way as 5.3.14.

 This conforms to the intent expressed above and seems good to me.
 wp_header() for 3.6 sounds good.

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Ticket URL: <http://core.trac.wordpress.org/ticket/23021#comment:15>
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