 
 import Foundation
 
-let operationQueue = NSOperationQueue()
+var _requestOperationQueue: NSOperationQueue?
 
 class YYHRequest: NSObject, NSURLConnectionDataDelegate {
     typealias YYHRequestCompletionHandler = (NSURLResponse?, NSData?, NSError?) -> Void

        if (parameters.count > 0) {
            serializeRequestParameters()
        }

        connection = NSURLConnection(request: request(), delegate: self)
        connection!.setDelegateQueue(operationQueue)
        connection!.start()
    }
    

    init(url: NSURL) {
        self.url = url
        completionHandler = {response, data, error in}
    }
    
    // Request Loading
