ios - "Stream is sending an event before being opened"

Question

我正在尝试使用 Swift 发出 SOAP 请求。运行截至 2014 年 9 月 9 日的最新 Xcode/iOS。我使用 NSMutableURLRequest，我将 HTTPBody 添加到请求信息中。但是，一旦我用请求启动 NSURLConnection，我就会收到错误消息“Stream xxxxxxxxx 在打开之前正在发送事件”。我没有使用任何网络库，只是一个普通的旧 NSURLConnection。关于什么可能导致此错误的任何想法？谢谢!

使用中的相关代码:

func createSOAPRequestWithEnvelope(soapEnvelope : String) {
    //create request
    var url = NSURL(string: "https://my-service-url")
    var req = NSMutableURLRequest(URL: url, cachePolicy: NSURLRequestCachePolicy.UseProtocolCachePolicy, timeoutInterval: 5000)

    req.addValue("text/xml",    forHTTPHeaderField: "Content-Type")
    req.HTTPMethod = "POST"
    req.HTTPBody = soapEnvelope.dataUsingEncoding(NSUTF8StringEncoding)

    //begin connection
    var connection = NSURLConnection(request: req, delegate: self, startImmediately: false)
    connection.scheduleInRunLoop(NSRunLoop.mainRunLoop(), forMode: NSDefaultRunLoopMode)

    connection.start() //error happens after this command :(
}

//takes care of NTLM Authentication
func connection(connection: NSURLConnection!, didReceiveAuthenticationChallenge challenge: NSURLAuthenticationChallenge!) {
    var authMethod = challenge.protectionSpace.authenticationMethod

    if authMethod == NSURLAuthenticationMethodNTLM {
        var credential = NSURLCredential(user: self.username,
            password: self.password,
            persistence: NSURLCredentialPersistence.ForSession)

        challenge.sender.useCredential(credential, forAuthenticationChallenge: challenge)
    }
}

func connection(connection: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
    // Response received, clear out data
    self.transactionData = NSMutableData()
}

func connection(connection: NSURLConnection!, didReceiveData data: NSData!) {
    // Store received data
    self.transactionData?.appendData(data)
}

Answer 1

Stream not Open 的问题似乎直接出在 CFNetwork 实现上。 (使用 NSConnection 和 NSSession 时可重现)。它发生在需要分 block 的请求(响应)中。此问题的副作用是 Windows 身份验证无法正常工作，每个请求都需要经过完整的握手过程。并且在 iOS 8.1 中也没有修复。