[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):

 In 23021-3.patch:

 - Remove `Last-Modified` header from wp_get_nocache_headers(). That gives
 a chance for a plugin to add it back if needed.
 - Remove the test `if ( empty( $headers['Last-Modified'] ) ...` in
 WP::send_headers() in class-wp.php. That header would not be set if the
 user is logged in, on query error or feed. If not, it's
 [http://core.trac.wordpress.org/browser/trunk/wp-includes/class-
 wp.php#L323 always set].

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Ticket URL: <http://core.trac.wordpress.org/ticket/23021#comment:7>
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