[wp-trac] [WordPress Trac] #34353: redirect_canonical() – Undefined indexes 'host' and 'scheme'

[WordPress Trac]

#34353: redirect_canonical() – Undefined indexes 'host' and 'scheme'
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 Reporter:  theamila                      |       Owner:  (none)
     Type:  defect (bug)                  |      Status:  reopened
 Priority:  normal                        |   Milestone:  Future Release
Component:  Canonical                     |     Version:  4.3.1
 Severity:  normal                        |  Resolution:
 Keywords:  needs-patch needs-unit-tests  |     Focuses:
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Comment (by Cybr):

 This notice happens because HTTP/1.0 doesn't fill the `HTTP_HOST` index in
 `$_SERVER`. HTTP/1.1 and higher do support that index. Alas, around the
 world, archaic browsers and servers are still using HTTP/1.0.

 Because of that, `$requested_url` isn't populated, and `$original = @
 parse_url( $requested_url );` won't have anything useful to parse, and
 won't fill in the `host` index. Ergo, three notices will pop up when
 trying to call `$original['host']`.

 I think we can polyfill the `$_SERVER['HTTP_HOST']` index early. Doing so
 would also address #47733. Be mindful of virtual hosts.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34353#comment:21>
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