When using HTTP KeepAlive, how often to send TCP KeepAlive packets over sockets being kept alive. Default = 1000. Only relevant if keepAlive is set to true.
Maximum number of sockets to leave open in a free state. Only relevant if keepAlive is set to true. Default = 256.
Maximum number of sockets to allow per host. Default for Node 0.10 is 5, default for Node 0.12 is Infinity
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Keep sockets around in a pool to be used by other requests in the future. Default = false