（Server-sent Events）浅谈H5 中的服务器推送事件(2)-木庄网络博客

服务端应当返回怎样的数据格式？应当以什么样的响应给客户端呢？先来个.Net 的样例

/// <summary>
    /// 推送消息
    /// </summary>
    /// <returns></returns>
    [HttpGet]
    public HttpResponseMessage SentNews()
    {
        HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK);
        try
        {
            //response.Headers.Add("Access-Control-Allow-Origin", "*");//如需要跨域可配置
            string data_str = “推送至客户端的数据”;//当然可以是json字符串格式
            string even = "", data = "";
            if (!string.IsNullOrWhiteSpace(data_str))
            {
                even = "event:sentMessage\n";
                data = "data:" + data_str + "\n\n";
            }
            string retry = "retry:" + 1000 + "\n";//连接断开后重连时间（毫秒），其实可以理解为轮询时间 2333...
            byte[] array = Encoding.UTF8.GetBytes(even + data + retry);
            Stream stream_result = new MemoryStream(array);
            response.Content = new StreamContent(stream_result);
            response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/event-stream");//此处一定要配置
            response.Headers.CacheControl = new CacheControlHeaderValue();
            response.Headers.CacheControl.NoCache = false;
        }
        catch (Exception ex)
        {
            LogHelper.WriteWebLog(ex);
        }
        return response;
    }