Django redirect within my code without changing display url and send right status code

Question

I'll like to redirect the url like my admin using subdomain without changing the url

 admin.example.com

so in my middleware ill change this to

example.com/admin

but still display the url as if there was no redirect.

here is what my middleware currently looks like

from django.http import HttpResponseRedirect
from django.conf import settings
sitename = getattr(settings,'SITE_DEFAULT_DOMAIN')[:4]


class SubdomainMiddleware(object):       
    def process_request(self, request):
        host = request.get_host()
        domain_parts = host.split('.')
        entry_url = "{0}://{1}{2}".format(request.META['wsgi.url_scheme'],\
                                          host,\
                                          request.get_full_path() )
        setattr(request,'entry_url',entry_url)
        if (len(domain_parts) > 2):
            subdomain = domain_parts[0]
            if subdomain.lower() not in ('www',sitename):
                request.incoming_path = request.META['PATH_INFO']
                domain = '.'.join(domain_parts[1:])
                if request.META['PATH_INFO'] == '/' :
                    path = "{0}{1}{2}".format('/',subdomain,'/')            
                else:
                    path = "{0}{1}{2}".format('/',subdomain,request.META['PATH_INFO'])
            else:
                domain = host.replace('www','')
                path = request.META['PATH_INFO']
            redirect_path = "{0}://{1}{2}".format(request.META['wsgi.url_scheme'],domain, path)
            return HttpResponseRedirect(redirect_path)

    def process_response(self, request, response):
        entry_url = getattr(request,'entry_url',None)
        if entry_url:
            response.location = entry_url
        return response