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Add downloader middleware ordering details to the docs 

Add more details, making it easier to understand what are the effects of
setting a downloader middleware order.
This commit is contained in:
Jose Ricardo 2016-10-18 11:22:55 -02:00
parent 7e20725eb7
commit bebcd5081c
1 changed files with 5 additions and 1 deletions
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6
docs/topics/downloader-middleware.rst
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@ -27,7 +27,11 @@ The :setting:`DOWNLOADER_MIDDLEWARES` setting is merged with the
:setting:`DOWNLOADER_MIDDLEWARES_BASE` setting defined in Scrapy (and not meant
to be overridden) and then sorted by order to get the final sorted list of
enabled middlewares: the first middleware is the one closer to the engine and
the last is the one closer to the downloader.
the last is the one closer to the downloader. In other words,
the :meth:`~scrapy.downloadermiddlewares.DownloaderMiddleware.process_request`
method of each middleware will be invoked in increasing
middleware order (100, 200, 300, ...) and the :meth:`~scrapy.downloadermiddlewares.DownloaderMiddleware.process_response` method
of each middleware will be invoked in decreasing order.
To decide which order to assign to your middleware see the
:setting:`DOWNLOADER_MIDDLEWARES_BASE` setting and pick a value according to