[wp-trac] [WordPress Trac] #39679: Redirect loop on attachment pages

[WordPress Trac]

#39679: Redirect loop on attachment pages
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 Reporter:  OPunWide      |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Media         |     Version:  4.7.1
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by geekysoft):

 @OPunWide, somewhere in either WordPress or your server setting, you‘ve
 inadvertently used upper case characters in your domain
 (YourFriendPaul.com should be yourfriendpaul.com everywhere.) From your
 server headers, it looks like it’s somewhere in WordPress’ configuration.
 (The following header is produced by WordPress.)

     Location: http://YourFriendPaul.com/wp/the-illusion-of-control.html
 /placebo-like-icon

 The infinite redirects here are caused by a WordPress bug when comparing
 an upper-case domain to a lower-case domain. I’m trying to narrow down
 exactly where this comparison takes place.

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 For my own situation, I have a reverse proxying server in front of
 WordPress. Files are fetched from origin.example.com and served as
 www.example.com. Every other WordPress page gets the correct
 www.example.com page in every URL. However, for attachment pages there is
 some strange URL magic going on in redirect_canonical() that reads the
 server hostname from $_SERVER instead of WP_HOME. This is also a bug.
 There are a lot of assumptions and mistakes in this code that differs from
 the rest of Core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39679#comment:5>
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