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Based on the first sentence of the description, I was expecting a proxy that added callback support to arbitrary APIs. I hit "https://my-templar-proxy/?real_url=$x&real_param_a=10&callba..., it hits the real API and waits for the response, then hits my callback with it.

I feel like that might be more useful than what appears to be just a special-purpose varnish/squid

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Author here! That's certainly an interesting feature that could be added. I have on the future list to support sending responses back via AMQP. Your callback scheme isn't much different than that.

Congrats on the announcement. Templar looks like a great project.

Re AMQP, I want to mention that our Zurl project does something similar, but with ZeroMQ. It leads to some interesting possibilities: http://blog.fanout.io/2014/02/18/fun-with-zurl-the-http-webs...

Zurl is not an HTTP proxy though, but a ZeroMQ gateway. Templar with async responses would be much more generally useful to HTTP developers.

I agree, async responses are a great tool. It's a question of figuring out a good way of delivering them back to the client. Another option is a long poll endpoint within Templar that it can deliver a stream of responses on. AMQP is an easy option because it keeps Templar simple.

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