docs: middleware factories run for every request

aio-libs · Aug 29, 2017 · a98d2e6 · a98d2e6
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diff --git a/changes/2225.doc b/changes/2225.doc
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+Document that all app's middleware factories are run for every request.
diff --git a/docs/web.rst b/docs/web.rst
@@ -904,6 +904,10 @@ the **next** *middleware factory*. The last *middleware factory* always receives
 the :ref:`request handler <aiohttp-web-handler>` selected by the router itself
 (by :meth:`UrlDispatcher.resolve`).
 
+.. note::
+
+   The chain of factories is run for every handled request.
+
 *Middleware factories* should return a new handler that has the same signature
 as a :ref:`request handler <aiohttp-web-handler>`. That is, it should accept a
 single :class:`Request` instance and return a :class:`Response`, or raise an
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		Document that all app's middleware factories are run for every request.