Added passing cookies from long polling session to web scoket

Author: OneSman7

Source/SocketIO/Engine/SocketEngine.swift

@@ -281,7 +281,7 @@ open class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePollable, So
     private func createWebSocketAndConnect() {
         var req = URLRequest(url: urlWebSocketWithSid)
 
-        addHeaders(to: &req)
+        addHeaders(to: &req, includingCookies: session?.configuration.httpCookieStorage?.cookies)
 
         ws = WebSocket(request: req)
         ws?.callbackQueue = engineQueue

Source/SocketIO/Engine/SocketEngineSpec.swift

@@ -155,11 +155,16 @@ extension SocketEngineSpec {
         return com.url!
     }
 
-    func addHeaders(to req: inout URLRequest) {
-        if let cookies = cookies {
-            req.allHTTPHeaderFields = HTTPCookie.requestHeaderFields(with: cookies)
+    func addHeaders(to req: inout URLRequest, includingCookies additionalCookies: [HTTPCookie]? = nil) {
+        
+        var cookiesToAdd = [HTTPCookie]()
+        cookiesToAdd += cookies ?? []
+        cookiesToAdd += additionalCookies ?? []
+        
+        if !cookiesToAdd.isEmpty {
+            req.allHTTPHeaderFields = HTTPCookie.requestHeaderFields(with: cookiesToAdd)
         }
-
+        
         if let extraHeaders = extraHeaders {
             for (headerName, value) in extraHeaders {
                 req.setValue(value, forHTTPHeaderField: headerName)