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extension AFHTTPRequestOperationManager {
    
    func cancelRequestWithUrl(url: String) {
        
        let operations = operationQueue.operations
        
        for operation in operations {
            if let afOperation = operation as? AFHTTPRequestOperation,
                operationUrl = afOperation.request.URL
                where operationUrl.isEquivalent(url) {
                    afOperation.cancel()
                    println("***Canceled")
                    break
            }
        }
        
    }
    
}