[Twisted-web] HTTPClient vs. HTTPClientFactory
amcnabb at mcnabbs.org
Thu Apr 17 20:32:03 EDT 2008
I'm still a little new to Twisted, so I was wondering if some kind soul
might be willing to help make sure I'm looking at things correctly.
First, I think I understand the difference between protocol factories
and protocols, but I could use a little reassurance. My current
understanding is that the protocol factory holds the state that is
common to all connections, whereas the protocol holds the state that is
specific to a particular connection. Is that an accurate understanding?
If that is correct, then what is the difference between a protocol
factory and a protocol for a client (like HTTPClient) where only one
connection is involved? I'm a bit confused about why HTTPClientFactory
isn't a trivial class. According to my current understanding, all of
the logic would be in HTTPClient.
I was also confused about why HTTPClientFactory would set
`self.protocol.followRedirect = followRedirect` in its __init__ method.
Since `self.protocol` is the HTTPPageGetter class, it appears that the
client factory is setting the followRedirect attribute for all
connections (associated with all HTTPClientFactories). I was surprised
that HTTPClientFactory wouldn't set `self.followRedirect =
followRedirect`, in which case HTTPClient would look at
If someone could help clear up these questions for me, I feel like I
would understand Twisted a lot better.
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