always set a session

Author: nuclearace

README.md

@@ -69,7 +69,7 @@ Carthage
 -----------------
 Add this line to your `Cartfile`:
 ```
-github "socketio/socket.io-client-swift" ~> 4.0.2 # Or latest version
+github "socketio/socket.io-client-swift" ~> 4.0.3 # Or latest version
 ```
 
 Run `carthage update --platform ios,macosx`.
@@ -83,7 +83,7 @@ source 'https://github.com/CocoaPods/Specs.git'
 platform :ios, '8.0'
 use_frameworks!
 
-pod 'Socket.IO-Client-Swift', '~> 4.0.2' # Or latest version
+pod 'Socket.IO-Client-Swift', '~> 4.0.3' # Or latest version
 ```
 
 Install pods:
@@ -111,7 +111,7 @@ CocoaSeeds
 Add this line to your `Seedfile`:
 
 ```
-github "socketio/socket.io-client-swift", "v4.0.2", :files => "SocketIOClientSwift/*.swift" # Or latest version
+github "socketio/socket.io-client-swift", "v4.0.3", :files => "SocketIOClientSwift/*.swift" # Or latest version
 ```
 
 Run `seed install`.

Socket.IO-Client-Swift.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "Socket.IO-Client-Swift"
-  s.version      = "4.0.2"
+  s.version      = "4.0.3"
   s.summary      = "Socket.IO-client for iOS and OS X"
   s.description  = <<-DESC
                    Socket.IO-client for iOS and OS X.
@@ -12,7 +12,7 @@ Pod::Spec.new do |s|
   s.author       = { "Erik" => "[email protected]" }
   s.ios.deployment_target = '8.0'
   s.osx.deployment_target = '10.10'
-  s.source       = { :git => "https://github.com/socketio/socket.io-client-swift.git", :tag => 'v4.0.2' }
+  s.source       = { :git => "https://github.com/socketio/socket.io-client-swift.git", :tag => 'v4.0.3' }
   s.source_files  = "SocketIOClientSwift/**/*.swift"
   s.requires_arc = true
   # s.dependency 'Starscream', '~> 0.9' # currently this repo includes Starscream swift files

SocketIOClientSwift/SocketEngine.swift

@@ -93,6 +93,12 @@ public final class SocketEngine: NSObject, SocketEngineSpec, WebSocketDelegate {
                 continue
             }
         }
+        
+        if session == nil {
+            session = NSURLSession(configuration: .defaultSessionConfiguration(),
+                delegate: nil,
+                delegateQueue: workQueue)
+        }
     }
 
     public convenience init(client: SocketEngineClient, options: NSDictionary?) {