Alamofire怎么请求WebService

func reqWebService() {
        let URL = NSURL(string: "http://115.29.41.12:83/serForImccoy.asmx")!
        let action: String = "http://imccoy.com/webservices/isUser"
        let mutableURLRequest: NSMutableURLRequest = NSMutableURLRequest(URL:URL)

        let values = "{\"userId\": \"test\", \"pwd\": \"pwd\"}";
        let soapMsg: String = toSoapMessage("isUser", params: "json", paramValues: values)

        //mutableURLRequest.setValue("application/soap+xml; charset=utf-8", forHTTPHeaderField: "Content-Type")
        //么的，oc中，Content-Type是application/soap+xml就可以访问，swift里，就不行，必须与.asmx接口保持一致！
        mutableURLRequest.setValue("text/xml; charset=utf-8", forHTTPHeaderField: "Content-Type")
        mutableURLRequest.setValue(action, forHTTPHeaderField: "SOAPAction")
        mutableURLRequest.setValue(String(soapMsg.length), forHTTPHeaderField: "Content-Length")
        mutableURLRequest.HTTPMethod = "POST"
        mutableURLRequest.HTTPBody = soapMsg.dataUsingEncoding(NSUTF8StringEncoding)

        var result = ""
        Alamofire.request(mutableURLRequest).responseString(encoding: NSUTF8StringEncoding) { (_, _, result: String?, _) -> Void in
            println("服务器返回的内容：\(result!)")
        }
    }

    func toSoapMessage(methodName: String, params: String, paramValues: String) -> String {
        var message: String = String()
        message += "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
        message += "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
        message += "<soap:Body>"
        message += "<\(methodName) xmlns=\"http://imccoy.com/webservices/\">"
        message += "<\(params)>\(paramValues)</\(params)>"
        message += "</\(methodName)>"
        message += "</soap:Body>"
        message += "</soap:Envelope>"
        println("请求消息体： \(message)")
        return message
    }