[issue3972] Add Option to Bind to a Local IP Address in httplib.py

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> For my own case, I have a machine with 50 IP addresses set and I need to 
> run a script to grab data that will randomly select one of those IP 
> addresses to use for its outgoing connection.  That's something which 
> needs to be selected at the socket level, as best I understand the issue, 
> not on the routing end.

Why do you need to select manually between those 50 IP addresses?
Load-balancing? Fooling the remote server so that you don't get
blacklisted for opening too many connections?

The problem I see with adding this to httplib is that it's not
HTTP-specific. Other modules (smtplib etc.) might want to benefit,
depending on the use case.

By the way, what I mean by routing is your OS' internal routing table
for outbound packets. For example under Linux:

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
X.Y.223.0       0.0.0.0         255.255.255.0   U     0      0        0 eth1
X.Y.222.0       0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         X.Y.222.254     0.0.0.0         UG    100    0        0 eth0

The interface for each outbound route is part of the routing table.

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<http://bugs.python.org/issue3972>
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