swift - 服务器与Kitura发送事件

我尝试在客户端使用Angular2/typescript网站，在服务器端使用Mac OSX上的Swift中的Kitura服务器。
在客户端，typescript代码实例化一个EventSource对象：

    this.eventSource = new EventSource(this.webSocketServerUrl);
    this.eventSource.onopen = (event: Event): any => {
        console.log("ServerNotificationsService.onopen - " + JSON.stringify(event) + " " + this.eventSource.readyState);
        event.stopPropagation();
        return null;
    }
    this.eventSource.onerror = (event: sse.IOnMessageEvent) => {
        console.log("ServerNotificationsService.onerror - " + JSON.stringify(event) + " " + this.eventSource.readyState);
    }
    this.eventSource.onmessage = (event: Event): any => {
        console.log("ServerNotificationsService.onmessage - " + JSON.stringify(event) + " " + this.eventSource.readyState);
        event.stopPropagation();
        return null;
    }
    console.log("ServerNotificationsService.constructor - " + this.eventSource.readyState);

在服务器端，处理GET请求的代码如下所示：

router.get("/notifications") { request, response, next in
response.headers.append("Access-Control-Allow-Origin", value: "*")

if((request.accepts(header: "Accept", type: "text/event-stream")) != nil)
{
  response.headers.append("content-type", value: "text/event-stream; charset=utf-8")
  response.headers.append("cache-control", value: "no-cache")
  response.headers.append("connection", value: "keep-alive")
  try response.end()
  Logger.sharedInstance.verbose(msg: "Request GET /notifications OK")
}
else
{
  try response.status(.internalServerError).end()
  Logger.sharedInstance.verbose(msg: "Request GET /notifications internalServerError")
}

next()
}

以及处理post请求：

router.post("/notifications") { request, response, next in
Logger.sharedInstance.verbose(msg: "Request POST /notifications ...")
response.headers.append("Access-Control-Allow-Origin", value: "*")
response.headers.append("content-type", value: "text/event-stream; charset=utf-8")
response.headers.append("cache-control", value: "no-cache")
response.headers.append("connection", value: "keep-alive")

while (true)
{
  // wait here 5s. for the <nextMessage>
  response.send(<nextMessage>)
  try response.end()
  Logger.sharedInstance.verbose(msg: "Request POST /notifications OK")
  next()
}
}

问题是，在客户端，我接收到on Open通知，事件源的readyState传递到“Open”（1），但在onerror通知和readyState传递到“Connecting”（0）之后，我立即接收到。等等：连接，关闭，连接，关闭。。。因此，post请求永远不会执行。
我将感谢一些帮助，有一个代码，保持开放连接。
谢谢您，
诺图

最佳答案

Kitura目前不支持持久的、开放的HTTP连接。但是，您可以使用WebSocket而不是服务器通过HTTP发送事件来复制功能（您需要重写前端代码以使用WebSockets而不是EventSource）：
https://github.com/IBM-Swift/Kitura-WebSocket
Kitura WebSocket应用程序示例如下：
https://github.com/IBM-Swift/Kitura-Chat-Server

关于swift - 服务器与Kitura发送事件，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/41552672/