1 always not match in Django re_path regular expression

Question

I try to create a dynamic path which accepts either null or positive integer.

For example:

http://127.0.0.1:8000/my_url/

http://127.0.0.1:8000/my_url/23

in url.py:

from django.urls import path, re_path
urlpatterns = [
    re_path(r'^my_url/(\s*|[0-9]{0,})$', views.my_function, name='my_function'),
]

in view.py:

def my_function(request, my_id):
    if my_id == '':
        #Do somthing
    else:
        #Do another somthing
      

Strange thing is:

followings passed in my test:

http://127.0.0.1:8000/my_url/

http://127.0.0.1:8000/my_url/2

http://127.0.0.1:8000/my_url/10

The only one that failed (meaning return to 404, no url found) is:

http://127.0.0.1:8000/my_url/1

why only '1' does not match? Is 1 treated specially in re_path function?

/****** Update ******/

It turns out that there is simply something wrong with my browser (might be a cookie issue). After I clean up and restart my browser, the regular expression works for 1 as well.

Answer 1

The update on your question explains that this is likely some caching mechanism in the browser.

I would however advise to split this up into two paths: one with an <int:my_int> parameter, and one without such parameter. These can both call the same view:

from django.urls import path

urlpatterns = [
    path('my_url/', views.my_function, name='my_function'),
    path('my_url/<int:my_id>/', views.my_function,  name='my_function')
]

In the view, you then make my_id an optional parameter that resolves to None in case it is not called with this parameter:

def my_function(request, my_id=None):
    if my_id is None:
        # do something
    else:
        # do something else