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docs/topics/request-response.rst
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@ -713,11 +713,15 @@ Errbacks
========
The errback of a request is a function that will be called when an exception
is raise while processing it.
is raised while processing it.
It receives a :exc:`~twisted.python.failure.Failure` as first parameter and can
be used to track connection establishment timeouts, DNS errors etc.
Scrapy sets the ``request`` attribute of that
:exc:`~twisted.python.failure.Failure` object to the :class:`~scrapy.Request`
object being processed.
If an errback raises an exception, Scrapy logs it and sends the
:signal:`spider_error` signal, unless the exception is the one that the errback
received, which Scrapy logs as a download error instead.