[Django]-Page not found 404 on Django site?

Django unable to resolve 127.0.0.1:8000/polls because url config defined as r'^polls/'.

Usual workaround:

mySite/urls.py:

from django.conf.urls import patterns, include, url
from django.contrib import admin

urlpatterns = patterns('',
url(r'^admin/', include(admin.site.urls)),
url(r'^polls/', include('polls.urls')),
)

Note:
Whenever Django encounters include(), It chops off whatever part of the URL matched up to that point and sends the remaining string to the included URLconf for further processing.

mySite/polls/urls.py:

from django.conf.urls import patterns, url
from polls import views

urlpatterns = patterns('polls.views',
url(r'^$', 'index', name='index'), 
)

Note: Instead of typing that out for each entry in urlpatterns, you can use the first argument to the patterns() function to specify a prefix to apply to each view function.

Answer If

If you want to access 127.0.0.1:8000/polls Note: without trailing slash

use view based url

url(r'^polls', 'polls.views.index', name='index'),

So now you can access 127.0.0.1:8000/polls without trailing slash.

You’re accessing to http://yourdomain.com/, and you don’t have any URL defined for “/”.

You have two options:

1. If you want to access to the index page of your polls application you have to enter the URL: yourdomain.com/polls

2. You can also modify you mySite/urls.py file to access from just yourdomain.com

   from django.conf.urls import patterns, include, url
   
   from django.contrib import admin
   urlpatterns = patterns('',
   
   url(r'^admin/', include(admin.site.urls)),
   
   url(r'^$', include('polls.urls')),
   
   )
   

To make the answer clear for beginners who has this issue by following the tutorial, the project root URLconf is the one in the same folder as settings.py which is:

 mysite/mysite/urls.py

Just make sure import ‘include’. The code looks like:

from django.conf.urls import include, url
from django.contrib import admin

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^polls/', include('polls.urls')),
]

So in
mysite/mysite/settings.py:

The line should be:

ROOT_URLCONF = 'mysite.urls'

You don’t need create a fresh new root URLconf.

Depending on where you put your ROOT urls.py, you set your ROOT_URLCONFIG accordingly, if you have it in your outermost folder containing manage.py then “urls” is ok. if you have it in someother folder then you have to do “.urls”

Credit for the answer to jerryh91

For more info about how it works, check How Django processes a request

You put the urls.py folder into the outer MySite folder, you are suppose to put it in the inner one so its not mySite/urls.py, but mySite/mySite/urls.py:

ran into the same mistake when i did the tutorial

Another way to access 127.0.0.1:8000/polls would be to redirect the browser when accessing 127.0.0.1:8000. It is done by editing .../mysite/mysite/urls.py as follows:

from django.conf.urls import include, url
from django.contrib import admin
from polls import views

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^polls/', include('polls.urls', namespace='polls')),
    url(r'^$', views.index, name='index'),
]

Page not found?

If you get an error page here, check that you’re going to http://localhost:8000/polls/ and not http://localhost:8000/.

Source : https://docs.djangoproject.com/en/3.0/intro/tutorial01/

Actually the problem is that you didn’t notice that
mysite/urls.py and polls/urls.py are two different files and you modified polls/urls.py instead of putting mysite/urls.py in the urls.py file in …mysite\mysite folder.

In my case, it was a stupid mistake. I wanted to integrate the plugin django-tinymce, and test it. So following this guide, I did the step 3 and exported the variable to the path. As the server runned again, I received the not found error, showing the message:

Using the URLconf defined in testtinymce.urls, Django tried these URL
patterns, in this order: ….

But I didn’t know what exactly it was, until I remembered exporting the variable DJANGO_SETTINGS_MODULE

running unset DJANGO_SETTINGS_MODULE in terminal solved my issue. Hope that it helps someone too.

Add the below line in your Mysite/urls.py

url(r'^$', views.index, name='index'),

and check. If you have created your project correctly, it should work. Else something like above might have happened to have more than one files so confused.

2017-10-05_12:03 ~/mysite/mysite
$ vi urls.py
2017-10-05_12:04 ~/mysite/mysite
$ cd ../..
2017-10-05_12:04 ~
$ mv mysite SENSIBLE_NAME_DJANGO_ROOT

i had the same issue and got it resolved by adding /polls after http://server:port/ and so final address in server looks like:
http://server:port/polls