Summary of Django middleware and summary of Django Middleware

Summary of Django middleware and summary of Django Middleware

I. Middleware

-- Middleware is a lightweight, underlying plug-in system that can be added to Django's request and response processes to modify Django's input and output.

-- Each middleware component is an independent Python class that can define one or more of the following methods

-- _ Init __: No parameter is required. The server calls the first request to determine whether to enable the current middleware.

-- Process_request (request): called before the execution view, and called on each request, the returned None or HttpResponse object

-- Process_view (request, view_func, view_args, view_kwargs): called before calling the view function, called on each request, and returned None or HtppResponse object

-- Process_template_response (request, response)

-- Process_response (request, response): all responses are called before the browser is returned. Each request is called and the HttpResponse object is returned.

-- Process_exception (request, response, exception): When a view throws an exception, it is called on each request and an HttpResponse object is returned.

A. What is middleware?

-- Middleware is a class

B. What are precautions for returned values?

-- No return value: continue to execute subsequent function middleware and view functions.

-- Return Value: Execute process_response with the returned value and the above response.

C. What has middleware done:

-- User Logon

-- Logging

-- Permission management

-- Session

-- Csrf

Process_view

D. Differences between middleware and decorator

-- Middleware is used for batch operations, and the decorator is used for a single