[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.
-------------------------------+--------------------------
 Reporter:  slene              |       Type:  defect (bug)
   Status:  new                |   Priority:  normal
Milestone:  Awaiting Review    |  Component:  General
  Version:  3.5                |   Severity:  critical
 Keywords:  reporter-feedback  |
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 In [http://core.trac.wordpress.org/ticket/22258 22258], the Last-Modified
 header set blank when user login.

 A response with a blank Last-Modified header will be set to "Thu, 01 Jan
 1970 00:00:00 GMT" in some server. The browser will be always send a If-
 Modified-Since header "Thu, 01 Jan 1970 00:00:00 GMT". and the server
 response a 304 status code. Make the browser can not refresh cache.

 In php5.2 the Last-Modified header always blank. But php5.3 has
 header_remove remove it.
 The Last-Modified header should be remove form $headers array when it
 blank.

 sorry my bad english...

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