python - Django frontend url failed to access method correctly, please help?

Question

Hello everyone, I am new to Django. Now I want to learn to make a download function. Set up a hyperlink in the front-end html, get the file name through the background access method and download it.
The code is as follows:
Front desk: (relatively simple, just a table with hyperlinked words)

URL configuration:

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^register/',views.userRigister,name='register'),
    url(r'^register/(.*)/$',views.file_download,name='download'),
]

VIEW method:

def userRigister(req):
        status='welcome'
        #js alert出信息
        return render(req, 'register.html', {'status':json.dumps(status)})


def file_download(request,filename):
    print(filename)
    def file_iterator(file_name, chunk_size=1024):
        with open(file_name) as f:
            while True:
                c = f.read(chunk_size)
                if c:
                    yield c
                else:
                    break

    if os.path.exists('software/' + filename):
        the_file_name = filename
        response = StreamingHttpResponse(file_iterator(the_file_name))
        return response
    else:
        return HttpResponse('error!no such file!')

My purpose is to select a downloadable browser when visiting the same page normally. After clicking the hyperlink button, access the file_download method and download the corresponding browser. However, the file_download method is currently unavailable, so please give me some advice. Thank you

Answer 1

Django matches URLs from top to bottom in the URL list
Anything that can be matched by ^register/(.*)/$ must be matched by the above ^register/ matches^register/(.*)/$匹配的一定能被上面的^register/匹配
所以就出现了^register/(.*)/$So there is a situation where ^register/(.*)/$ never matches
The solution is very simple, just change the order of these two

url(r'^admin/', admin.site.urls),
url(r'^register/(.*)/$',views.file_download,name='download'),
url(r'^register/',views.userRigister,name='register'),

When using Django’s URL parsing function, remember that more detailed URLs should be placed farther forward, and more “blurred” URLs should be placed farther back.