feat(transport): enable keep-alives and limit number of sockets

lib/transports.js

@@ -7,13 +7,18 @@ var timeoutReq = require('timed-out');
 var http = require('http');
 var https = require('https');
 
+var agentOptions = { keepalive: true, maxSockets: 100 };
+var httpAgent = new http.Agent(agentOptions);
+var httpsAgent = new https.Agent(agentOptions);
+
 function Transport() {}
 util.inherits(Transport, events.EventEmitter);
 
 function HTTPTransport(options) {
  this.defaultPort = 80;
  this.transport = http;
  this.options = options || {};
+ this.agent = httpAgent;
 }
 util.inherits(HTTPTransport, Transport);
 HTTPTransport.prototype.send = function(client, message, headers, eventId, cb) {
@@ -23,7 +28,8 @@ HTTPTransport.prototype.send = function(client, message, headers, eventId, cb) {
  headers: headers,
  method: 'POST',
  port: client.dsn.port || this.defaultPort,
- ca: client.ca
+ ca: client.ca,
+ agent: this.agent
  };
  for (var key in this.options) {
  if (this.options.hasOwnProperty(key)) {
@@ -84,6 +90,7 @@ function HTTPSTransport(options) {
  this.defaultPort = 443;
  this.transport = https;
  this.options = options || {};
+ this.agent = httpsAgent;
 }
 util.inherits(HTTPSTransport, HTTPTransport);