[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:  Awaiting Review
Component:  General       |     Version:  3.5
 Severity:  critical      |  Resolution:
 Keywords:                |
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Changes (by SergeyBiryukov):

 * keywords:  reporter-feedback =>


Old description:

> 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...

New description:

 In #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#comment:1>
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