How does middleware ordering work in Scrapy?

How does middleware ordering work in Scrapy?

In Scrapy, middleware is processed in the order it's defined in the settings. Each middleware can modify requests and responses.

Can you give me an example of how to set the order of middlewares?

Sure! You can set the order in your settings.py file like this: DOWNLOADER_MIDDLEWARES = { 'myproject.middlewares.MyCustomMiddleware': 543, 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware': 400, }.

What happens if I change the order of the middlewares?

Changing the order can affect how requests and responses are processed. For example, if a middleware that modifies requests is placed after one that handles responses, it won't have any effect on those responses.

Are there any best practices for ordering middlewares?

Yes, it's best to place middlewares that handle requests before those that handle responses, and to consider dependencies between them.