Keep sockets around in a pool to be used by other requests in the future. Default = false
keepAliveMsecs
keepAliveMsecs:number
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.
maxFreeSockets
maxFreeSockets:number
Maximum number of sockets to leave open in a free state. Only relevant if keepAlive is set to true. Default = 256.
maxSockets
maxSockets:number
Maximum number of sockets to allow per host. Default for Node 0.10 is 5, default for Node 0.12 is Infinity
Keep sockets around in a pool to be used by other requests in the future. Default = false