Add createConnection option for http or https requests (#120)

lib/eventsource.js

@@ -98,6 +98,10 @@ function EventSource (url, eventSourceInitDict) {
     // but for now exists as a backwards-compatibility layer
     options.rejectUnauthorized = !(eventSourceInitDict && !eventSourceInitDict.rejectUnauthorized)
 
+    if (eventSourceInitDict && eventSourceInitDict.createConnection !== undefined) {
+      options.createConnection = eventSourceInitDict.createConnection
+    }
+
     // If specify http proxy, make the request to sent to the proxy server,
     // and include the original url in path and Host headers
     var useProxy = eventSourceInitDict && eventSourceInitDict.proxy

test/eventsource_test.js

@@ -8,6 +8,7 @@ var fs = require('fs')
 var mocha = require('mocha')
 var assert = require('assert')
 var u = require('url')
+var net = require('net')
 
 var it = mocha.it
 var describe = mocha.describe
@@ -599,6 +600,31 @@ describe('HTTP Request', function () {
       })
     })
   })
+
+  it('checks createConnection option', function (done) {
+    createServer(function (err, server) {
+      if (err) return done(err)
+
+      var testResult = false
+
+      server.on('request', function () {
+        assert.ok(testResult)
+        server.close(done)
+      })
+
+      var urlObj = u.parse(server.url)
+
+      new EventSource(server.url, {
+        createConnection: function () {
+          var connection = net.createConnection({ port: urlObj.port, host: urlObj.hostname })
+          connection.on('connect', function () {
+            testResult = true
+          })
+          return connection
+        }
+      })
+    })
+  })
 })
 
 describe('HTTPS Support', function () {