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I hope somebody told the poster about putting a proxy server (squid, apache, nginx, varnish, etc.) between the application server and the client.

Proxy deals with slow client delays. App server serves app requests at speed. Tune number of proxy connections to keep app servers reasonably busy. Scale each layer individually.

IMO Whether the proxy is async or not is a matter of taste.

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I would rather buffer the entire response in the app server, instead of in the central reverse-proxy.

Why buffer on the app server?

Because we have multiple app servers, but only one reverse-proxy? I don't want to centralize a task that could be distributed.

So you're basically causing your own problems by refusing to scale your proxy layer, which should be dirt cheap hardware, while scaling your beefier app servers. You basically have it backwards.

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