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    }