Feature request: BindSame, bind the outgoing connection to the IP address of the incoming connection that triggered the outgoing request

Hello list,

I just started to play with polipo, it's very good!

Tinyproxy [1] has a nice feature/option named BindSame: "If this
boolean parameter is set to yes, then Tinyproxy will bind the outgoing
connection to the IP address of the incoming connection that triggered
the outgoing request.", from tinyproxy.conf(5) [2]. A quick look at
the code [3] shows that indeed server remembers the IP to which client
connected to and uses it in a bind() just before connect() for
outgoing connections. This feature is useful when the proxy server has
multiple IP addresses: depending on which one you connect to, you exit
with a different proxy IP.

What would you think of adding this feature to polipo?
I guess the workaround right now would be to use multiple polipo
instances bound on the different IPs.

Cheers,
StalkR

[1] https://banu.com/tinyproxy/
[2] http://linux.die.net/man/5/tinyproxy.conf
[3] https://github.com/banu/tinyproxy

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