Java 当我们使用servlet3规范中提到的AsyncContext时,http连接保持打开的时间有多长?
当我们使用servlet3规范中提到的AsyncContext时,http连接保持打开多久? 我的代码是Java 当我们使用servlet3规范中提到的AsyncContext时,http连接保持打开的时间有多长?,java,servlets,long-polling,servlet-3.0,Java,Servlets,Long Polling,Servlet 3.0,当我们使用servlet3规范中提到的AsyncContext时,http连接保持打开多久? 我的代码是 final AsyncContext asyncContext = httpServletRequest.startAsync(); asyncContext.setTimeout(0); asyncContexts.offer(asyncContext); .... .... new Thread(new Runnable() { @Override publ
final AsyncContext asyncContext = httpServletRequest.startAsync();
asyncContext.setTimeout(0);
asyncContexts.offer(asyncContext);
....
....
new Thread(new Runnable() {
@Override
public void run() {
try {
final BufferedReader read = facade.getStreamData();
while (read.ready()) {
httpServletResponse.setContentType("text/html");
if(i 100) {
asyncContext.complete();
}
if(Strings.isNullOrEmpty(read.readLine())) {
continue;
}
asyncContext.getResponse().getWriter().print(read.readLine());
asyncContext.getResponse().flushBuffer();
i = i + 10;
Thread.sleep(2000);
}
asyncContext.getResponse().getWriter().print("#" + 100);
asyncContext.getResponse().flushBuffer();
asyncContext.complete();
} catch (IOException e) {
throw new RuntimeException(
"Error when writing the event.", e);
} catch (InterruptedException e) {
throw new RuntimeException(
"Error when writing the event.", e);
}
} }).start();
它正在工作!当缓冲区被刷新时,内容在客户端可用
我的问题是,此连接保持打开的时间有多长?即使标题中没有提到保持活动,服务器如何管理它?我终于得到了答案。
即使不存在keep-alive标头,服务器也会维护默认的keep-alive。连接在该段时间内处于打开状态。AsyncContext将继续扩展连接,直到手动关闭连接或向客户端发送数据的时间超过保持活动(提及或默认)时间。因此,基本上它在客户端表现为一个非常慢的网络连接