javascript - Only allowing N amount of connections in Node.js -

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i started learning node.js on side , though know allow many connections physically possible, i'd know how limit amount of numbers.

say, i'm handling http requests , when connection rate goes 4 people, don't want go further others have wait until free spot available again when finishes request.

also i'd know how make user try reconnect 4 times before being told server's busy 4 connections.


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