[wp-trac] [WordPress Trac] #3555: Some servers escape $_SERVER['HTTP_IF_NOT_MODIFIED'], breaking 304 Etag matching

[WordPress Trac]

#3555: Some servers escape $_SERVER['HTTP_IF_NOT_MODIFIED'], breaking 304 Etag
matching
-------------------------+--------------------------------------------------
 Reporter:  markjaquith  |       Owner:  anonymous
     Type:  defect       |      Status:  new      
 Priority:  high         |   Milestone:  2.1      
Component:  General      |     Version:  2.0.6    
 Severity:  major        |    Keywords:           
-------------------------+--------------------------------------------------
 I've found that on some servers, {{{$_SERVER['HTTP_IF_NOT_MODIFIED']}}} is
 backslash-escaped.  WP then comes along and escapes it again, so your Etag
 looks like:

 {{{\\\"65e8871191351efa4678a314e040fa34\\\"}}}

 Then, before checking, WP runs {{{stripslashes()}}} once, which gets you
 to:

 {{{\"65e8871191351efa4678a314e040fa34\"}}}

 It then tries to compare the Etags, but fails, because of the backslashes.
 Thus, a 304 is not served, content is served, and bandwidth is wasted.

 Patches coming.

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Ticket URL: <http://trac.wordpress.org/ticket/3555>
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