Apache in MPM_Prefork is generally on the higher end, Apache with MPM_Event is relatively light but nginx should be lighter. If nginx is too much then you'd probably need to make something yourself. Since you mention json, node.js might also be a consideration but no experience with it myself.
As for the port redirection, maybe ip forwarding with iptables then? If that isn't any good then maybe a bit more information is required?
Last edited by r3sistance; 05-09-2017 at 09:54 AM.
Reason: node.js
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