如何使用 ASGI 来部署¶
同 WSGI 一样，Django 也支持使用 ASGI 来部署，它是为了支持异步网络服务器和应用而新出现的 Python 标准。
startproject management command sets up a default ASGI
configuration for you, which you can tweak as needed for your project, and
direct any ASGI-compliant application server to use.
Django includes getting-started documentation for the following ASGI servers:
Like WSGI, ASGI has you supply an
application callable which
the application server uses to communicate with your code. It's commonly
provided as an object named
application in a Python module accessible to
startproject command creates a file
<project_name>/asgi.py that contains such an
It's not used by the development server (
runserver), but can be used by
any ASGI server either in development or in production.
ASGI servers usually take the path to the application callable as a string;
for most Django projects, this will look like
While Django's default ASGI handler will run all your code in a synchronous thread, if you choose to run your own async handler you must be aware of async-safety.
Do not call blocking synchronous functions or libraries in any async code. Django prevents you from doing this with the parts of Django that are not async-safe, but the same may not be true of third-party apps or Python libraries.
配置 settings 模块¶
When the ASGI server loads your application, Django needs to import the settings module — that's where your entire application is defined.
If this variable isn't set, the default
asgi.py sets it to
mysite is the name of your project.
Applying ASGI middleware¶
To apply ASGI middleware, or to embed Django in another ASGI application, you
can wrap Django's
application object in the
asgi.py file. For example:
from some_asgi_library import AmazingMiddleware application = AmazingMiddleware(application)