在 Swift 中为 SOAP POST 从 NSURLConnection 迁移到 NSURLSession
Posted
技术标签:
【中文标题】在 Swift 中为 SOAP POST 从 NSURLConnection 迁移到 NSURLSession【英文标题】：Moving from NSURLConnection to NSURLSession for SOAP POST in Swift 【发布时间】：2015-09-30 10:18:26 【问题描述】：我正在尝试从 NSURLConnection 转移到 NSURLSession 以进行 SOAP 发布，但 NSURLSessionDataDelegate 似乎存在问题。
这是 NSURLConnection 中运行良好的旧代码：
let soapMessage = "<?xml version='1.0' encoding='UTF-8'?><SOAP-ENV:Envelope xmlns:SOAP-ENV='http://schemas.xmlsoap.org/soap/envelope/' xmlns:ns1='http://tempuri.org/'><SOAP-ENV:Body><ns1:get_Countries/></SOAP-ENV:Body></SOAP-ENV:Envelope>"
print("Soap Packet is \(soapMessage)")
let urlString = "https://example.com/Service.svc"
let url = NSURL(string: urlString)
let theRequest = NSMutableURLRequest(URL: url!)
let msgLength = String(soapMessage.characters.count)
theRequest.addValue("text/xml; charset=utf-8", forHTTPHeaderField: "Content-Type")
theRequest.addValue(msgLength, forHTTPHeaderField: "Content-Length")
theRequest.addValue("http://tempuri.org/IService/get_Countries", forHTTPHeaderField: "SoapAction")
theRequest.HTTPMethod = "POST"
theRequest.HTTPBody = soapMessage.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
print("Request is \(theRequest.allHTTPHeaderFields!)")
let connection = NSURLConnection(request: theRequest, delegate: self, startImmediately: false)
connection?.start()
此代码然后使用 NSURLConnectionDelegate，并且工作正常，如下所示：
func connection(connection: NSURLConnection!, didReceiveResponse response: NSURLResponse!)
MutableData.length = 0;
let httpresponse = response as? NSHTTPURLResponse
print("status \(httpresponse?.statusCode)")
//print("headers \(httpresponse?.allHeaderFields)")
func connection(connection: NSURLConnection!, didReceiveData data: NSData!)
MutableData.appendData(data)
func connection(connection: NSURLConnection, didFailWithError error: NSError)
NSLog("Error with Soap call: %@", error)
func connectionDidFinishLoading(connection: NSURLConnection!)
let xmlParser = NSXMLParser(data: MutableData)
xmlParser.delegate = self
xmlParser.parse()
xmlParser.shouldResolveExternalEntities = true
func connection(connection: NSURLConnection, willSendRequestForAuthenticationChallenge challenge: NSURLAuthenticationChallenge)
if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust && challenge.protectionSpace.host == "example.com"
NSLog("yep")
let credential = NSURLCredential(trust: challenge.protectionSpace.serverTrust!)
challenge.sender!.useCredential(credential, forAuthenticationChallenge: challenge)
else
NSLog("nope")
challenge.sender!.performDefaultHandlingForAuthenticationChallenge!(challenge)
所以这些代码都可以正常工作，仅供参考，这样您就可以看到我过去所做的事情，以及 API 确实可以工作的事实！但是，如果我转而使用 NSURLSession 和 NSURLSessionDataDelegate ，那么我将无法使其正常工作。
所以这是新代码：
let soapMessage = "<?xml version='1.0' encoding='UTF-8'?><SOAP-ENV:Envelope xmlns:SOAP-ENV='http://schemas.xmlsoap.org/soap/envelope/' xmlns:ns1='http://tempuri.org/'><SOAP-ENV:Body><ns1:get_Countries/></SOAP-ENV:Body></SOAP-ENV:Envelope>"
print("Soap Packet is \(soapMessage)")
let urlString = "https://example.com/Service.svc"
let url = NSURL(string: urlString)
let theRequest = NSMutableURLRequest(URL: url!)
let msgLength = String(soapMessage.characters.count)
theRequest.addValue("text/xml; charset=utf-8", forHTTPHeaderField: "Content-Type")
theRequest.addValue(msgLength, forHTTPHeaderField: "Content-Length")
theRequest.addValue("http://tempuri.org/IService/get_Countries", forHTTPHeaderField: "SoapAction")
theRequest.HTTPMethod = "POST"
theRequest.HTTPBody = soapMessage.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
print("Request is \(theRequest.allHTTPHeaderFields!)")
let config = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration:config, delegate: self, delegateQueue: NSOperationQueue.mainQueue())
let task = session.dataTaskWithRequest(theRequest)
task.resume()
我使用的代理是 NSURLSessionDelegate、NSURLSessionDataDelegate：
func URLSession(session: NSURLSession, didReceiveChallenge challenge: NSURLAuthenticationChallenge, completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential?) -> Void)
print("Am in NSURLSessionDelegate didReceiveChallenge")
if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust && challenge.protectionSpace.host == "example.com"
NSLog("yep authorised")
let credential = NSURLCredential(trust: challenge.protectionSpace.serverTrust!)
challenge.sender!.useCredential(credential, forAuthenticationChallenge: challenge)
else
NSLog("nope")
challenge.sender!.performDefaultHandlingForAuthenticationChallenge!(challenge)
func URLSessionDidFinishEventsForBackgroundURLSession(session: NSURLSession)
print("Am in URLSessionDidFinishEventsForBackgroundURLSession")
let xmlParser = NSXMLParser(data: MutableData)
xmlParser.delegate = self
xmlParser.parse()
xmlParser.shouldResolveExternalEntities = true
func URLSession(session: NSURLSession, didBecomeInvalidWithError error: NSError?)
print("error of \(error)")
func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveResponse response: NSURLResponse, completionHandler: (NSURLSessionResponseDisposition) -> Void)
print("Am in didReceiveResponse")
MutableData.length = 0
func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData)
print("Am in didReceiveData")
MutableData.appendData(data)
func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?)
print("error of \(error)")
所以，当我运行代码时，我会得到输出：
“我在 NSURLSessionDelegate didReceiveChallenge” “是的，授权”
所以它可以很好地进入didReceiveChallenge，并且它似乎可以很好地授权HTTPS安全证书，但是没有进一步的事情发生，它没有做任何其他事情，我希望它进入didReceiveResponse然后didReceiveData，但没有进一步发生。
所以我被卡住了，我当然可以继续使用 NSURLConnection，因为它一切正常，但我想了解 NSURLSession，特别是我哪里出错了。因此，如果有人能提供帮助，那就太好了。
谢谢
【问题讨论】：
【参考方案1】：如果其他人有同样的问题，我解决了这个问题。问题是我没有在 didReceiveChallenge 和 didReceiveResponse 代表中使用 completionHandler
【讨论】：
如果你解决了，你能发布答案吗？拜托？我也确实需要帮助。【参考方案2】：func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveResponse response: NSURLResponse, completionHandler: (NSURLSessionResponseDisposition) -> Void)
completionHandler(NSURLSessionResponseDisposition.Allow) //.Cancel,如果要停止下载
【讨论】：
以上是关于在 Swift 中为 SOAP POST 从 NSURLConnection 迁移到 NSURLSession的主要内容，如果未能解决你的问题，请参考以下文章
使用 Swift Alamofire 从 SOAP 中提取 JSON 数据