#27402: When using i18n_patterns and prefix_default_language=False, 404 page
redirects incorrectly
-------------------------------------+-------------------------------------
     Reporter:  Hovi                 |                    Owner:  nobody
         Type:  Uncategorized        |                   Status:  new
    Component:                       |                  Version:  1.10
  Internationalization               |
     Severity:  Normal               |               Resolution:
     Keywords:                       |             Triage Stage:
                                     |  Unreviewed
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
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Comment (by Hovi):

 It's definitely not same thing as #27063. I took a deeper look and it is a
 little more complicated.
 When I just added test, it was passing anyway and it turned out problem is
 little more specific to my case (it is still bug though).
 I have something like this in my url as last record without i18npatterns:

 r'^(?P<group1>.+)/(?P<group2>.+)/$

 So what exactly happens here:
 1, language_path is constructed as /en/non-existent-page instead of /non-
 existent-page
 2, language_path passes is_valid_path(language_path,... because that url
 matches my regex.
 3, that leads to redirect

 Code after that constructs url for redirect (variable language_url) also
 doesn't take into account possibility default language without prefix, so
 that part may also need reviewing but I am not even sure if that can ever
 happen.

 Attaching simple test.

--
Ticket URL: <https://code.djangoproject.com/ticket/27402#comment:2>
Django <https://code.djangoproject.com/>
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