[wp-trac] [WordPress Trac] #42512: Domain with special character redirect loop on homepage

[WordPress Trac]

#42512: Domain with special character redirect loop on homepage
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 Reporter:  stefan-niedermann  |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Canonical          |     Version:  4.5
 Severity:  normal             |  Resolution:
 Keywords:  needs-patch        |     Focuses:
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Changes (by dd32):

 * keywords:   => needs-patch
 * component:  General => Canonical


Comment:

 Hey @stefan-niedermann Sorry for the length of time before this got a
 reply, as I said on Github, we've got more open tickets than volunteer
 time to manage them.

 Just noting that this is indeed an issue when using UTF8 characters
 directly in the URL. Using punycode encoded hostnames fixes this.

 The issue is caused by a mis-match in how WordPress treats the hostname,
 for example, the hostname that the browser sends for `http://centös/` is
 `http://xn--cents-mua/`, those two strings don't match so WordPress will
 redirect to `http://cent%C3%B6s/` as part of the canonical code.

 This is triggered on the front-page when a static home-page is used, as we
 set `$redirect_url` to `home_url('/')` assuming that it'll match
 `$requested_url` and abort, but that doesn't happen in this scenario.

 Short-term solution: Set the home/site url to punycode encoded domain
 name.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42512#comment:1>
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