How to make custom url prefix in django

Question

Have a little problem, tried to google it, but get nothing. What I need: Configure a URL for app in Django, like this:

/myproject/myapp/models.py
class MyApp(models.Model):
    name = models.CharField()
    ....

/myproject/myapp/views.py
def make_something_with_app(app_id):
    # will make smthing cool

Let's think, my site has a "example.com" address, and we have two objects in DB from MyApp model - app1(id=0), app2(id=1). So, what I need? When we go to the app1.example.com, we call make_something_with_app(0), and when we go to the app2.example.com, we call make_something_with_app(1)

Is there a way to make it? Thanks.