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Why not use DummyNet, Clumsy or Network Link Conditioner (depending on your OS of choice)?

If you really need a HTTP proxy there are tools like Charles (although the low RTT to a proxy may change the nature of the testing)

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My main use-case is programmatically throttling the outbound concurrent connections to a VPN. Writing a small proxy server in Node.js seemed like a reasonable approach for this.

Back in my network engineering days there were iptables rules to crapping up the packets. Was very useful for simulating dialup connections.

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