[wp-trac] [WordPress Trac] #18043: Uploaded images dissapear after loading if using compression w/Apache

[WordPress Trac]

#18043: Uploaded images dissapear after loading if using compression w/Apache
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 Reporter:  ctsttom       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Multisite     |    Version:
 Severity:  major         |   Keywords:
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 I have found an issue between WordPress (Multisite) + Google Chrome (Mac)
 which I think appeared on my sever when I enabled compression a few months
 ago, but could never reproduce because it only happens with images managed
 by a Multisite WordPress install, not static images.

 With images that are static Apache sends the file and calculates the
 Content-Length its self so these images work fine but if you access a file
 uploaded to WordPress it uses the .htaccess redirect so the image requests
 are sent via ms-files.php for what ever reason.

 The problem is that WordPress decides to calculate its own Content-Length
 header in the HTTP Response which means that security conscious browsers
 like Google Chrome freak out when the data they receive is less than they
 we're told by Apache and they resultantly disable the image.

 The Content-Length calculation comes on line 43 of ms-files.php I don't
 know why its needed because Apache seems to sort it out automatically if
 you don't send your own header, in fact most of the file seems like an
 unnessisary load of processing, perhaps it needs reviewing but this is a
 major issue as it is a growing browser, on a growing platform.

 Here is a great video of it in action:
 http://www.screencast.com/t/cUYKSegW0N

 This issue has been repeatedly reported on the forum:

 http://wordpress.org/support/topic/disappearing-images
 http://wordpress.org/support/topic/multisite-images-broken
 http://wordpress.org/support/topic/image-not-show-in-google-chrome-
 timthumbphp

 Please fix this asap!

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Ticket URL: <http://core.trac.wordpress.org/ticket/18043>
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