#30530: url `path` accepts newlines in various places.
               Reporter:  Sjoerd Job Postmus  |          Owner:  nobody
                   Type:  Bug                 |         Status:  new
              Component:  Core (URLs)         |        Version:  master
               Severity:  Normal              |       Keywords:
           Triage Stage:  Unreviewed          |      Has patch:  0
    Needs documentation:  0                   |    Needs tests:  0
Patch needs improvement:  0                   |  Easy pickings:  0
                  UI/UX:  0                   |
 Consider the following simplified `urls.py`.

 from django.http import HttpResponse
 from django.urls import path

 def path_view(request):
     return HttpResponse('<pre>===&gt;' + request.path + '&lt;===</pre>')

 def render_something(request, something):
     return HttpResponse('<pre>===&gt;' + something + '&lt;===</pre>')

 urlpatterns = [
     path('hello/', path_view),
     path('foo/<something>/bar/', render_something),

 By accessing `http://localhost:8000/hello/%0a`, it's clear that the
 newline is accepted in the URL. This is because the underlying logic uses
 a `$` in the regular expression, instead of `\Z`..

 By accessing `http://localhost:8000/foo/hello%0aworld/bar/`, it's clear
 that the default `str` converter accepts anywhere in the segment. This is
 because it uses a negative match `[^/]+`, which happily accepts a newline
 character (both `%0a` and `%0d`).

 I propose changing the `$` to `\Z`, and the negative match to `[^/\r\n]+`.

 I would also suggest changing the documentation on the `re_path` to
 suggest `\Z` instead of `$`, though that may be more controversial.

Ticket URL: <https://code.djangoproject.com/ticket/30530>
Django <https://code.djangoproject.com/>
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