comet

问题 Can someone please explain me how the "Forever Frame" technique works ? A code example would be awesome! I went through all the material i could find in Google but i still don`t have much of an idea how it works. 回答1: Dylan Schiemann gives a great explanation. In short, it uses "chunked encoding", a feature of HTTP/1.1 intended for an entirely different purpose, but which allows the server to maintain a connection to the client indefinitely, sending additional data to the client at will. As

问题 I was trying to implement COMET chat using Async Processing defined in Servlet API 3. It was not working - chat got blocked, so I have created debug servlet to test async part only. This is my doGet method: @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { log.debug("doGet called"); int timeout = 30 + RandomUtils.nextInt(60); String message = RandomStringUtils.randomAlphanumeric(50 + RandomUtils.nextInt(250));

问题 I was trying to implement COMET chat using Async Processing defined in Servlet API 3. It was not working - chat got blocked, so I have created debug servlet to test async part only. This is my doGet method: @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { log.debug("doGet called"); int timeout = 30 + RandomUtils.nextInt(60); String message = RandomStringUtils.randomAlphanumeric(50 + RandomUtils.nextInt(250));

问题 Which native server is best, in your opinion, to implement long-polling / Comet? The first target application is chat, but there will be other implementations - we basically need push-to-client capabilities. I'm limiting the answers to C# or Java because these two technologies are dominant at my workplace. The requirements are as usual: performance, ease of deployment/programming, customization, ... 回答1: IIS + WebSync is a very straight-forward, scalable and extensible solution for server

问题 Building a social network, I'm trying to fetch live notifications. Currently, the site sends an AJAX request every few seconds using setInterval. It looks something like this: setInterval ( function(){ url = base_dir+"/ajax/file.php"; data = "data=someData"; $.ajax({ type: "POST", url: url, data: data, dataType: "json", beforeSend: function(x) { if(x && x.overrideMimeType) { x.overrideMimeType("application/json;charset=UTF-8"); } }, success: function(JSON){ // retrieve data here } }); }, 5000

问题 I'm working on an iPhone application which will use long-polling to send event notifications from the server to the client over HTTP. After opening a connection on the server I'm sending small bits of JSON that represent events, as they occur. I am finding that -[NSURLConnectionDelegate connection:didReceiveData] is not being called until after I close the connection, regardless of the cache settings I use when creating the NSURLRequest . I've verified that the server end is working as

问题 I am looking for a simple and reliable Comet javascript library. I want to keep a persistent streaming of data from my server (via PHP script) to the client side. I tried building my own using the iframe technique, but there are lots of issues with safari which I experienced. I am just hoping someone else has created a simple library for it? 回答1: There is a jquery comet plugin Probably the best version though is the Dojo library I have a quick list of commands I used to get a jetty server

问题 I am implementing a system where I need real-time updates. I have been looking at certain scenarios and among all was Comet. Implementing this I do not see any way this is different from traditional long-polling. In both cases you have to send a request, and then the server send a response back. In the browser you interpret the response and then you start a new request. So why should I use comet if in both cases I need to open and close connections. 回答1: Some Comet techniques don't require

问题 How do I use Django with the Tornado web server? 回答1: it's very simple ( especially with django 1.4) . 1 - just build your django project( and apps ) and make sure it works fine. 2- create a new python file at the root folder ( same dir where you used django-admin.py startproject ) 3- then copy the code below , edit the os.environ['DJANGO_SETTINGS_MODULE'] line, and paste it in that new .py file. import os import tornado.httpserver import tornado.ioloop import tornado.wsgi import sys import

问题 I'm attempting to retrieve a url parameter within a CometActor to validate that the source of the data matches the destination, e.g A user sends a message from room A, which should be received and displayed only in room A, not B or C. I've tried: S.param("message").openOr("") But it's always empty, can this be done? Or is there another way to stop Comet messages going where they shouldn't? Thanks in advance for any help, much appreciated :) 回答1: CometActors exist outside of the session and so