proxy platforms, what technology they use to achieve this - proxy

There are many proxy platforms,
I'd like to know what technology they use to achieve this.
hope get the details, i know some python, but do not know how to get the proxy lists

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I want to use gio and glib to create client-server communication. However, I'm getting confused with GSocket. Can someone give some examples.
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How would a client/server utilizing UPnP work in Ruby?

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I think the title is enough for understanding what I need.
What I want to get is a piece of code that injects 1 packet into another software socket.
My research on this turned some ways to accomplish this
I found something about LibPCap, but I don't know if this is able to inject packets too. I know it capture packets.
Another way was to use Hook API (inject some DLL's) ... but I didn't understand this, so I haven't managed to use it.
Port forwarding was another way
None of this was successful for me because I wasn't focused on any of this one. I want to know witch one is the easiest way to implement and I'll be happy to hear your ideas on doing this.
BEFORE POSTING: I'LL USE THIS JUST TO CHECK OUT SOMETHING ON MY PROJECT. I WON'T USE THIS TO HARM OR HACK.
If you can go with a little python, scapy should do the trick quite easily :)

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Thanks in advance.
There are about a billion ways you could do this. Could you post more about what the problem is you're trying to solve, or what the content/purpose/size/format/etc. of the messages is to be? Are you building something "for real" or just trying to learn network programming?
Also, do you already have the lower layer stuff figured out? You have networking infrastructure setup, IP addresses assigned, etc? If not, you'll need to get through that. Once you have that, you could start with a tutorial on basic socket programming in Ruby, but - depending on the answers to the questions above - you might not want to "roll your own" solution at that level. The answer might be to use an XMPP (Jabber) server, and use an XMPP client library, or you might want to deploy something like ActiveMQ, HornetQ, etc. and use a library for interfacing with that. Or maybe you want to use HTTP and pass messages around in JSON, or XML or $WHATEVER. In short, there are a LOT of options in this area.

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