Middleware is a powerful feature in Django that allows you to process requests and responses before and after they are handled by your views. Middleware can be used for a wide range of tasks, such as authentication, caching, compression, and more.
Here are the steps to create middleware in Django:
1. Create a new Python file in one of your app\’s folders (e.g. `middleware.py`).
2. Define a new class that inherits from `object` or `MiddlewareMixin` (if you are using Django 1.10+). Your middleware class should have a `__init__` method that takes a `get_response` argument. This method will be called only once when the web server starts up, and it should store the `get_response` argument as an instance variable.
“`python
class MyMiddleware:
def __init__(self, get_response):
self.get_response = get_response
“`
3. Implement the `__call__` method on your middleware class. This method will be called on each request and response. In this method, you can perform any processing you want to do before or after the view is called, and then call `get_response` to execute the next middleware or the view itself.
class MyMiddleware:
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request):
# Code to be executed for each request before
# the view (and later middleware) are called.
response = self.get_response(request)
# Code to be executed for each response after
# the view (and later middleware) are called.
return response
4. Add your middleware class to the `MIDDLEWARE` setting in your Django project\'s settings file (`settings.py`). Be sure to add it to the correct position in the list, depending on the order you want your middleware to be executed.
```python
MIDDLEWARE = [
# Other middleware classes...
\'myapp.middleware.MyMiddleware\',
# Other middleware classes...
]
```
That\'s it! Your middleware will now be executed on each request and response. You can add any custom processing you want to the `__call__` method, such as logging, authentication, or modifying the request or response objects.
