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tomcatweb 管理(Tomcat源码解析之Web请求与处理)

更多 时间:2021-10-12 00:29:15 类别:服务器 浏览量:2222

tomcatweb 管理

Tomcat源码解析之Web请求与处理

前言

Tomcat最全UML类图

tomcatweb 管理(Tomcat源码解析之Web请求与处理)

Tomcat请求处理过程:

tomcatweb 管理(Tomcat源码解析之Web请求与处理)

Connector对象创建的时候,会创建Http11NioProtocol的ProtocolHandler,在Connector的startInteral方法中,会启动AbstractProtocol,AbstractProtocol启动NioEndPoint进行监听客户端的请求,EndPoint接受到客户端的请求之后,会交给Container去处理请求。请求从Engine开始经过的所有容器都含有责任链模式,每经过一个容器都会调用该容器的责任链对请求进行处理。

tomcatweb 管理(Tomcat源码解析之Web请求与处理)

一、EndPoint

tomcatweb 管理(Tomcat源码解析之Web请求与处理)

默认的EndPoint实现是NioEndPoint,NioEndPoint有四个内部类,分别是Poller、Acceptor、PollerEvent、SocketProcessor、NioSocketWrapper。

(1)Acceptor负责监听用户的请求,监听到用户请求之后,调用getPoller0().register(channel);先将当前请求封装成PollerEvent,new PollerEvent(socket, ka, OP_REGISTER); 将当前请求,封装成注册事件,并添加到PollerEvent队列中,然后将PollerEvent注册到Poller的Selector对象上面。

(2)Poller线程会一直遍历可以处理的事件(netty的selestor),当找到需要处理的事件之后,调用processKey(sk, socketWrapper);对,执行要处理的PollerEvent的run方法,对请求进行处理。

(3)PollerEvent继承自Runnable接口,在其run方法里面,如果是PollerEvent的事件是注册OP_REGISTER,那么就将当前的socket注册到Poller的selector上。

  •  public void run() {
                if (interestOps == OP_REGISTER) {
                    try {
                    	// 核心代码,终于找到了!!!!!
                        // 当事件是注册的时候,将当前的NioSocketChannel注册到Poller的Selector上。
                        socket.getIOChannel().register(
                                socket.getPoller().getSelector(), SelectionKey.OP_READ, socketWrapper);
                    } catch (Exception x) {
                        log.error(sm.getString("endpoint.nio.registerFail"), x);
                    }
                } else {
                    final SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
                    try {
                        if (key == null) {
    
                            // The key was cancelled (e.g. due to socket closure)
                            // and removed from the selector while it was being
                            // processed. Count down the connections at this point
                            // since it won't have been counted down when the socket
                            // closed.
                            // SelectionKey被取消的时候需要将SelectionKey对应的EndPoint的Connection计数器,减一
                            socket.socketWrapper.getEndpoint().countDownConnection();
                            ((NioSocketWrapper) socket.socketWrapper).closed = true;
                        } else {
                            final NioSocketWrapper socketWrapper = (NioSocketWrapper) key.attachment();
                            if (socketWrapper != null) {
                                //we are registering the key to start with, reset the fairness counter.
                                int ops = key.interestOps() | interestOps;
                                socketWrapper.interestOps(ops);
                                key.interestOps(ops);
                            } else {
                                socket.getPoller().cancelledKey(key);
                            }
                        }
                    } catch (CancelledKeyException ckx) {
                        try {
                            socket.getPoller().cancelledKey(key);
                        } catch (Exception ignore) {
                        }
                    }
                }
            }
    
    
  • (4)Poller线程内会执行keyCount = selector.select(selectorTimeout);获取当前需要处理的SelectionKey的数量,然后当keyCount大于0时,会获取selector的迭代器,遍历所有需要的selectionkey,并对其进行处理。在这里将socket的事件封装成NioSocketWrapper。

  • // 得到selectedKeys的迭代器
    Iterator<SelectionKey> iterator =
             keyCount > 0 ? selector.selectedKeys().iterator() : null;
    
     // 遍历所有的SelectionKey,并对其进行处理
     while (iterator != null && iterator.hasNext()) {
         SelectionKey sk = iterator.next();
         iterator.remove();
         NioSocketWrapper socketWrapper = (NioSocketWrapper) sk.attachment();
         // Attachment may be null if another thread has called
         // cancelledKey()
         // 如果有attachment,就处理
         if (socketWrapper != null) {
             // 处理事件
             processKey(sk, socketWrapper);
         }
     }
    
    
  • processKey在处理SelectionKey,如果当前Poller已经关闭,就取消key。SelectionKey对应的Channel如果发生读事件,就调用AbatractEndPoint.processSocket执行读操作processSocket(attachment, SocketEvent.OPEN_READ, true),如果SelectionKey对应的Channel发生写事件,就执行processSocket(attachment, SocketEvent.OPEN_WRITE, true);读大于写。socket的事件处理调用的是AbatractEndPoint的processSocket方法。

  • protected void processKey(SelectionKey sk, NioSocketWrapper attachment) {
    	     try {
    	         if (close) {
    	             // 如果Poller已经关闭了,就取消key
    	             cancelledKey(sk);
    	         } else if (sk.isValid() && attachment != null) {
    	             if (sk.isReadable() || sk.isWritable()) {
    	                 if (attachment.getSendfileData() != null) {
    	                     processSendfile(sk, attachment, false);
    	                 } else {
    	                     unreg(sk, attachment, sk.readyOps());
    	                     boolean closeSocket = false;
    	                     // Read goes before write
    	                     // 读优于写
    	                     // 如果SelectionKey对应的Channel已经准备好了读
    	                     // 就对NioSocketWrapper进行读操作
    	                     if (sk.isReadable()) {
    	                         if (!processSocket(attachment, SocketEvent.OPEN_READ, true)) {
    	                             closeSocket = true;
    	                         }
    	                     }
    	                     // 如果SelectionKey对应的Channel已经准备好了写
    	                     // 就对NioSocketWrapper进行写操作
    	                     if (!closeSocket && sk.isWritable()) {
    	                         if (!processSocket(attachment, SocketEvent.OPEN_WRITE, true)) {
    	                             closeSocket = true;
    	                         }
    	                     }
    	                     if (closeSocket) {
    	                         // 如果已经关闭了,就取消key
    	                         cancelledKey(sk);
    	                     }
    	                 }
    	             }
    	             
    }
    
    
  • AbatractEndPoint.processSocket方法首先从缓存中获取SocketProcessor类,如果缓存中没有就创建一个,SocketProcessorBase接口对应的就是NioEndPoint.SocketProcessor,也就是Worker。将对应的SocketProcessor类放入到线程池中执行。

  •  public boolean processSocket(SocketWrapperBase<S> socketWrapper,
                                     SocketEvent event, boolean dispatch) {
    
    	// 得到socket的处理器
    	// Connector在构造函数里面已经指定了协议:org.apache.coyote.http11.Http11NioProtocol。
    	SocketProcessorBase<S> sc = processorCache.pop();
    	if (sc == null) {
    	// 如果没有,就创建一个Socket的处理器。创建的时候指定socketWrapper以及socket的事件。
    	    sc = createSocketProcessor(socketWrapper, event);
    	} else {
    	    sc.reset(socketWrapper, event);
    	}
    	//socket的处理交给了线程池去处理。
    	Executor executor = getExecutor();
    	if (dispatch && executor != null) {
    	    executor.execute(sc);
    	} else {
    	    sc.run();
    	}
    
    
  • (5)NioEndPoint.NioSocketWrapper,是Socket的封装类,增强类,将Socket与其他对象建立关联。

  •  public static class NioSocketWrapper extends SocketWrapperBase<NioChannel> {
     		private final NioSelectorPool pool;
    
            private Poller poller = null; // 轮询的Poller 
            private int interestOps = 0;
            private CountDownLatch readLatch = null;
            private CountDownLatch writeLatch = null;
            private volatile SendfileData sendfileData = null;
            private volatile long lastRead = System.currentTimeMillis();
            private volatile long lastWrite = lastRead;
            private volatile boolean closed = false;
    
    
  • (6)NioEndPoint.SocketProcessor(Worker)继承了Runnable接口,负责对socket的g各种事件进行处理。读事件、写事件、停止时间、超时事件、断连事件、错误时间、连接失败事件。

    tomcatweb 管理(Tomcat源码解析之Web请求与处理)

    SocketProcessor的doRun方法,会根据SocketState进行处理,SocketState 为STOP、DISCONNECT或者ERROR的时候就进行关闭,SocketWrapperBase对应的selector事件,得到指定的Handler处理器进行处理。

  • @Override
     protected void doRun() {
         NioChannel socket = socketWrapper.getSocket();
         SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
    
         try {
             int handshake = -1;
    
             try {
                 if (key != null) {
                     if (socket.isHandshakeComplete()) {
                         // 是否已经握手成功,不需要TLS(加密)握手,就让处理器对socket和event的组合进行处理。
                         handshake = 0;
                     } else if (event == SocketEvent.STOP || event == SocketEvent.DISCONNECT ||
                             event == SocketEvent.ERROR) {
                         // 不能够完成TLS握手,就把他认为是TLS握手失败。
                         handshake = -1;
                     } else {
                         handshake = socket.handshake(key.isReadable(), key.isWritable());
                         // The handshake process reads/writes from/to the
                         // socket. status may therefore be OPEN_WRITE once
                         // the handshake completes. However, the handshake
                         // happens when the socket is opened so the status
                         // must always be OPEN_READ after it completes. It
                         // is OK to always set this as it is only used if
                         // the handshake completes.
                         // 握手从/向socket读/写时,握手一旦完成状态应该为OPEN_WRITE,
                         // 握手是在套接字打开时发生的,因此在完成后状态必须始终为OPEN_READ
                         // 始终设置此选项是可以的,因为它仅在握手完成时使用。
                         event = SocketEvent.OPEN_READ;
                     }
                 }
             } catch (IOException x) {
                 handshake = -1;
                 if (log.isDebugEnabled()) log.debug("Error during SSL handshake", x);
             } catch (CancelledKeyException ckx) {
                 handshake = -1;
             }
             if (handshake == 0) {
                 SocketState state = SocketState.OPEN;
                 // Process the request from this socket
                 if (event == null) {
                     // 调用处理器进行处理。
                     // NioEndPoint的默认Handler是Http11的
                     // 这里的Handler是AbstractProtocol.ConnectionHandler
                     // 这个Handler的设置方法是:
                     // 首先在Connector类的构造函数中,将默认的ProtocolHandler设置为org.apache.coyote.http11.Http11NioProtocol
                     // AbstractHttp11Protocol的构造函数里面创建了Handler类ConnectionHandler
                     state = getHandler().process(socketWrapper, SocketEvent.OPEN_READ);
                 } else {
                     state = getHandler().process(socketWrapper, event);
                 }
                 // 如果返回的状态是SocketState,那么就关掉连接
                 if (state == SocketState.CLOSED) {
                     close(socket, key);
                 }
             } else if (handshake == -1) {
                 getHandler().process(socketWrapper, SocketEvent.CONNECT_FAIL);
                 close(socket, key);
             } else if (handshake == SelectionKey.OP_READ) {
                 // 如果是SelectionKey.OP_READ,也就是读事件的话,就将OP_READ时间设置到socketWrapper
                 socketWrapper.registerReadInterest();
             } else if (handshake == SelectionKey.OP_WRITE) {
                 // 如果是SelectionKey.OP_WRITE,也就是读事件的话,就将OP_WRITE事件设置到socketWrapper
                 socketWrapper.registerWriteInterest();
             }
    
    
  • 二、ConnectionHandler

    tomcatweb 管理(Tomcat源码解析之Web请求与处理)

    (1)ConnectionHandler用于根据Socket连接找到相应的Engine处理器。

    上面是SocketProcessor的doRun方法,执行了getHandler().process(socketWrapper, SocketEvent.OPEN_READ);;process方法是首先在Map缓存中查找当前socket是否存在对应的processor,如果不存在,再去可循环的处理器栈中查找是否存在,如果不存在就创建相应的Processor,然后将新创建的Processor与Socket建立映射,存在connection的Map中。在任何一个阶段得到Processor对象之后,会执行processor的process方法state = processor.process(wrapper, status);

  • protected static class ConnectionHandler<S> implements AbstractEndpoint.Handler<S> {
    
            private final AbstractProtocol<S> proto;
            private final RequestGroupInfo global = new RequestGroupInfo();
            private final AtomicLong registerCount = new AtomicLong(0);
            // 终于找到了这个集合,给Socket和处理器建立连接
            // 对每个有效链接都会缓存进这里,用于连接选择一个合适的Processor实现以进行请求处理。
            private final Map<S, Processor> connections = new ConcurrentHashMap<>();
            // 可循环的处理器栈
            private final RecycledProcessors recycledProcessors = new RecycledProcessors(this);
    
    		
      		@Override
            public SocketState process(SocketWrapperBase<S> wrapper, SocketEvent status) {
                if (getLog().isDebugEnabled()) {
                    getLog().debug(sm.getString("abstractConnectionHandler.process",
                            wrapper.getSocket(), status));
                }
                if (wrapper == null) {
                    // wrapper == null 表示Socket已经被关闭了,所以不需要做任何操作。
                    return SocketState.CLOSED;
                }
                // 得到wrapper内的Socket对象
                S socket = wrapper.getSocket();
                // 从Map缓冲区中得到socket对应的处理器。
                Processor processor = connections.get(socket);
                if (getLog().isDebugEnabled()) {
                    getLog().debug(sm.getString("abstractConnectionHandler.connectionsGet",
                            processor, socket));
                }
    
                // Timeouts are calculated on a dedicated thread and then
                // dispatched. Because of delays in the dispatch process, the
                // timeout may no longer be required. Check here and avoid
                // unnecessary processing.
    
                // 超时是在专用线程上计算的,然后被调度。
                // 因为调度过程中的延迟,可能不再需要超时。检查这里,避免不必要的处理。
                if (SocketEvent.TIMEOUT == status &&
                        (processor == null ||
                                !processor.isAsync() && !processor.isUpgrade() ||
                                processor.isAsync() && !processor.checkAsyncTimeoutGeneration())) {
                    // This is effectively a NO-OP
                    return SocketState.OPEN;
                }
                // 如果Map缓存存在该socket相关的处理器
                if (processor != null) {
                    // Make sure an async timeout doesn't fire
                    // 确保没有触发异步超时
                    getProtocol().removeWaitingProcessor(processor);
                } else if (status == SocketEvent.DISCONNECT || status == SocketEvent.ERROR) {
                    // Nothing to do. Endpoint requested a close and there is no
                    // longer a processor associated with this socket.
                    // SocketEvent事件是关闭,或者SocketEvent时间出错,此时不需要做任何操作。
                    // Endpoint需要一个CLOSED的信号,并且这里不再有与这个socket有关联了
                    return SocketState.CLOSED;
                }
    
                ContainerThreadMarker.set();
    
                try {
                    // Map缓存不存在该socket相关的处理器
                    if (processor == null) {
                        String negotiatedProtocol = wrapper.getNegotiatedProtocol();
                        // OpenSSL typically returns null whereas JSSE typically
                        // returns "" when no protocol is negotiated
                        // OpenSSL通常返回null,而JSSE通常在没有协议协商时返回""
                        if (negotiatedProtocol != null && negotiatedProtocol.length() > 0) {
                            // 获取协商协议
                            UpgradeProtocol upgradeProtocol = getProtocol().getNegotiatedProtocol(negotiatedProtocol);
                            if (upgradeProtocol != null) {
                                // 升级协议为空
                                processor = upgradeProtocol.getProcessor(wrapper, getProtocol().getAdapter());
                                if (getLog().isDebugEnabled()) {
                                    getLog().debug(sm.getString("abstractConnectionHandler.processorCreate", processor));
                                }
                            } else if (negotiatedProtocol.equals("http/1.1")) {
                                // Explicitly negotiated the default protocol.
                                // Obtain a processor below.
                            } else {
                                // TODO:
                                // OpenSSL 1.0.2's ALPN callback doesn't support
                                // failing the handshake with an error if no
                                // protocol can be negotiated. Therefore, we need to
                                // fail the connection here. Once this is fixed,
                                // replace the code below with the commented out
                                // block.
                                if (getLog().isDebugEnabled()) {
                                    getLog().debug(sm.getString("abstractConnectionHandler.negotiatedProcessor.fail",
                                            negotiatedProtocol));
                                }
                                return SocketState.CLOSED;
                                /*
                                 * To replace the code above once OpenSSL 1.1.0 is
                                 * used.
                                // Failed to create processor. This is a bug.
                                throw new IllegalStateException(sm.getString(
                                        "abstractConnectionHandler.negotiatedProcessor.fail",
                                        negotiatedProtocol));
                                */
                            }
                        }
                    }
                    // 经过上面的操作,processor还是null的话。
                    if (processor == null) {
                        // 从recycledProcessors可循环processors中获取processor
                        processor = recycledProcessors.pop();
                        if (getLog().isDebugEnabled()) {
                            getLog().debug(sm.getString("abstractConnectionHandler.processorPop", processor));
                        }
                    }
                    if (processor == null) {
                        // 创建处理器
                        processor = getProtocol().createProcessor();
                        register(processor);
                        if (getLog().isDebugEnabled()) {
                            getLog().debug(sm.getString("abstractConnectionHandler.processorCreate", processor));
                        }
                    }
                    processor.setSslSupport(
                            wrapper.getSslSupport(getProtocol().getClientCertProvider()));
    
                    // 将socket和processor建立关联。
                    connections.put(socket, processor);
    
                    SocketState state = SocketState.CLOSED;
                    do {
                        // 调用processor的process方法。
                        state = processor.process(wrapper, status);
    
                        // processor的process方法返回升级状态
                        if (state == SocketState.UPGRADING) {
                            // Get the HTTP upgrade handler
                            // 得到HTTP的升级句柄
                            UpgradeToken upgradeToken = processor.getUpgradeToken();
                            // Retrieve leftover input
                            // 检索剩余输入
                            ByteBuffer leftOverInput = processor.getLeftoverInput();
                            if (upgradeToken == null) {
                                // Assume direct HTTP/2 connection
                                UpgradeProtocol upgradeProtocol = getProtocol().getUpgradeProtocol("h2c");
                                if (upgradeProtocol != null) {
                                    // Release the Http11 processor to be re-used
                                    release(processor);
                                    // Create the upgrade processor
                                    processor = upgradeProtocol.getProcessor(wrapper, getProtocol().getAdapter());
                                    wrapper.unRead(leftOverInput);
                                    // Associate with the processor with the connection
                                    connections.put(socket, processor);
                                } else {
                                    if (getLog().isDebugEnabled()) {
                                        getLog().debug(sm.getString(
                                                "abstractConnectionHandler.negotiatedProcessor.fail",
                                                "h2c"));
                                    }
                                    // Exit loop and trigger appropriate clean-up
                                    state = SocketState.CLOSED;
                                }
                            } else {
                                HttpUpgradeHandler httpUpgradeHandler = upgradeToken.getHttpUpgradeHandler();
                                // Release the Http11 processor to be re-used
                                release(processor);
                                // Create the upgrade processor
                                processor = getProtocol().createUpgradeProcessor(wrapper, upgradeToken);
                                if (getLog().isDebugEnabled()) {
                                    getLog().debug(sm.getString("abstractConnectionHandler.upgradeCreate",
                                            processor, wrapper));
                                }
                                wrapper.unRead(leftOverInput);
                                // Associate with the processor with the connection
                                connections.put(socket, processor);
                                // Initialise the upgrade handler (which may trigger
                                // some IO using the new protocol which is why the lines
                                // above are necessary)
                                // This cast should be safe. If it fails the error
                                // handling for the surrounding try/catch will deal with
                                // it.
                                if (upgradeToken.getInstanceManager() == null) {
                                    httpUpgradeHandler.init((WebConnection) processor);
                                } else {
                                    ClassLoader oldCL = upgradeToken.getContextBind().bind(false, null);
                                    try {
                                        httpUpgradeHandler.init((WebConnection) processor);
                                    } finally {
                                        upgradeToken.getContextBind().unbind(false, oldCL);
                                    }
                                }
                            }
                        }
                    } while (state == SocketState.UPGRADING);	
    
    
  • (2)以Http11协议为例,执行的是Http11Processor,Http11Processor的祖父类AbstractProcessorLight实现了process方法,process调用了service模板方法,service模板方法是由Http11Processor进行实现的。service方法最重要的操作是执行getAdapter().service(request, response);

  • @Override
        public SocketState service(SocketWrapperBase<?> socketWrapper)
                throws IOException {
    		// 上面省略n行
    		// 调用Coyote的service方法
    		 getAdapter().service(request, response);
    		 // 下面省略n行
    
    
  • 三、Coyote

    回顾一下CoyoteAdapter的创建是在Connector的initInternal方法。

  • @Override
        public SocketState service(SocketWrapperBase<?> socketWrapper)
                throws IOException {
    		// 上面省略n行
    		// 调用Coyote的service方法
    		 getAdapter().service(request, response);
    		 // 下面省略n行
    
    
  • Coyote的作用就是coyote.Request和coyote.Rsponse转成HttpServletRequest和HttpServletRsponse。然后,因为Connector在init的时候,将自己注入到了CoyoteAdapter中,所以,直接通过connector.getService()方法就可以拿到Service,然后从Service开始调用责任链模式,进行处理。

  • @Override
        public SocketState service(SocketWrapperBase<?> socketWrapper)
                throws IOException {
    		// 上面省略n行
    		// 调用Coyote的service方法
    		 getAdapter().service(request, response);
    		 // 下面省略n行
    
    
  • 四、容器责任链模式

    接下来就是从StandradEngine开始的责任链模式。首先执行StandradEngine的责任链模式,找到合适的Engine,合适的Engine在通过责任链模式找到合适的Context,直到找到StandardWrapperValve。最后执行到StandardWrapperValve的invoke方法。首先查看Context和Wrapper是不是不可用了,如果可用,并且Servelt还没有被初始化,就执行初始化操作。如果是单线程模式就直接返回之前创建好的Servelt,如果是多线程模式,就先创建一个Servelt对象进行返回。

  • @Override
        public final void invoke(Request request, Response response)
                throws IOException, ServletException {
            // 初始化我们需要的本地变量
            boolean unavailable = false;
            Throwable throwable = null;
            // This should be a Request attribute...
            long t1 = System.currentTimeMillis();
            // 原子类AtomicInteger,CAS操作,表示请求的数量。
            requestCount.incrementAndGet();
            StandardWrapper wrapper = (StandardWrapper) getContainer();
            Servlet servlet = null;
            Context context = (Context) wrapper.getParent();
    
            // 检查当前的Context应用是否已经被标注为不可以使用
            if (!context.getState().isAvailable()) {
                // 如果当前应用不可以使用的话,就报503错误。
                response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
                        sm.getString("standardContext.isUnavailable"));
                unavailable = true;
            }
    
            // 检查Servelt是否被标记为不可使用
            if (!unavailable && wrapper.isUnavailable()) {
                container.getLogger().info(sm.getString("standardWrapper.isUnavailable",
                        wrapper.getName()));
                long available = wrapper.getAvailable();
                if ((available > 0L) && (available < Long.MAX_VALUE)) {
                    response.setDateHeader("Retry-After", available);
                    response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
                            sm.getString("standardWrapper.isUnavailable",
                                    wrapper.getName()));
                } else if (available == Long.MAX_VALUE) {
                    response.sendError(HttpServletResponse.SC_NOT_FOUND,
                            sm.getString("standardWrapper.notFound",
                                    wrapper.getName()));
                }
                unavailable = true;
            }
            // Servelt是第一次调用的时候初始化
            try {
                if (!unavailable) {
                    // 如果此时Servelt还没有被初始化,就分配一个Servelt实例来处理request请求。
                    servlet = wrapper.allocate();
                }
            /// 省略代码..........................................
            // // 给该request创建Filter过滤链。Filter过滤链执行完之后,会执行Servelt
            ApplicationFilterChain filterChain =
                    ApplicationFilterFactory.createFilterChain(request, wrapper, servlet);
    
            // Call the filter chain for this request
            // NOTE: This also calls the servlet's service() method
            try {
                if ((servlet != null) && (filterChain != null)) {
                    // Swallow output if needed
                    if (context.getSwallowOutput()) {
                        try {
                            SystemLogHandler.startCapture();
                            if (request.isAsyncDispatching()) {
                                request.getAsyncContextInternal().doInternalDispatch();
                            } else {
                                // 调用过滤链
                                filterChain.doFilter(request.getRequest(),
                                        response.getResponse());
                            }
            /// 省略代码..........................................
            
    
    
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