Timeout Configuration for webclient

  springboot

Order

This article mainly studies the timeout configuration of webclient

SO_TIMEOUT

Such as this setting

SslContext sslContext = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();

        ClientHttpConnector httpConnector = new ReactorClientHttpConnector(options -> {
            options.sslContext(sslContext);
            options.option(ChannelOption.SO_TIMEOUT, this.applicationConfig.getHttpClientRequestTimeout());
            options.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, this.applicationConfig.getHttpClientConnectTimeout());
            options.poolResources(PoolResources.fixed("myPool", this.applicationConfig.getHttpClientMaxPoolSize()));
        });

        return WebClient.builder().clientConnector(httpConnector).defaultHeader("Authorization", "xxxx")
                .baseUrl(this.config.getBaseURL()).build();

This SO_TIMEOUT is only applicable to OIO, not NIO

ReadTimeoutHandler

ReactorClientHttpConnector connector = new ReactorClientHttpConnector(
                options -> options.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 2000)
                        .compression(true)
                        .afterNettyContextInit(ctx -> {
                            ctx.addHandlerLast(new ReadTimeoutHandler(5000, TimeUnit.MILLISECONDS));
                        }));
        return WebClient.builder()
                .clientConnector(connector)
                .build();

This method is only applicable to NIO

Client output

21:25:06.013 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0x7c18870e, L:/127.0.0.1:49812 - R:localhost/127.0.0.1:8080] FLUSH
io.netty.handler.timeout.ReadTimeoutException
21:25:10.948 [reactor-http-nio-4] ERROR reactor.ipc.netty.channel.ChannelOperations - [HttpClient] Error processing connection. Requesting close the channel
io.netty.handler.timeout.ReadTimeoutException: null
21:25:10.948 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0x7c18870e, L:/127.0.0.1:49812 - R:localhost/127.0.0.1:8080] CLOSE
21:25:10.951 [reactor-http-nio-4] ERROR org.springframework.web.reactive.function.client - onError(io.netty.handler.timeout.ReadTimeoutException)
21:25:10.951 [reactor-http-nio-4] ERROR org.springframework.web.reactive.function.client - 
io.netty.handler.timeout.ReadTimeoutException: null
21:25:10.953 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0x7c18870e, L:/127.0.0.1:49812 ! R:localhost/127.0.0.1:8080] CLOSE
21:25:10.954 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0x7c18870e, L:/127.0.0.1:49812 ! R:localhost/127.0.0.1:8080] INACTIVE
21:25:10.954 [reactor-http-nio-4] DEBUG reactor.ipc.netty.ReactorNetty -  Non Removed handler: [id: 0x7c18870e, L:/127.0.0.1:49812 ! R:localhost/127.0.0.1:8080], context: ReadTimeoutHandler, pipeline: ChannelHandlerContext(ReadTimeoutHandler, [id: 0x7c18870e, L:/127.0.0.1:49812 ! R:localhost/127.0.0.1:8080])
21:25:10.954 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0x7c18870e, L:/127.0.0.1:49812 ! R:localhost/127.0.0.1:8080] USER_EVENT: [Handler Terminated]

io.netty.handler.timeout.ReadTimeoutException
    Suppressed: java.lang.Exception: #block terminated with an error
        at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:89)
        at reactor.core.publisher.Mono.block(Mono.java:1162)
        at com.example.demo.WebClientTest.testSocketTimeout(WebClientTest.java:329)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
        at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
        at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
        at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

21:25:10.955 [reactor-http-nio-4] DEBUG reactor.ipc.netty.channel.ChannelOperationsHandler - [id: 0x7c18870e, L:/127.0.0.1:49812 ! R:localhost/127.0.0.1:8080] Disposing context reactor.ipc.netty.channel.PooledClientContextHandler@498959c2
21:25:10.955 [reactor-http-nio-4] DEBUG reactor.ipc.netty.channel.PooledClientContextHandler - Releasing channel: [id: 0x7c18870e, L:/127.0.0.1:49812 ! R:localhost/127.0.0.1:8080]
21:25:10.955 [reactor-http-nio-4] DEBUG reactor.ipc.netty.resources.DefaultPoolResources - Released [id: 0x7c18870e, L:/127.0.0.1:49812 ! R:localhost/127.0.0.1:8080], now 0 active connections
21:25:10.955 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0x7c18870e, L:/127.0.0.1:49812 ! R:localhost/127.0.0.1:8080] UNREGISTERED

block(Duration)

@Test
    public void testBlockTimeout() throws InterruptedException {
        Mono<ClientResponse> resp = WebClient.builder()
                .build().get()
                .uri("http://localhost:8080/timeout/download")
                .accept(MediaType.IMAGE_PNG)
                .exchange()
                .doOnError(e -> {
                    e.printStackTrace();
                });
        try{
            resp.block(Duration.ofSeconds(5));
        }catch (Exception e){
            e.printStackTrace();
        }
        TimeUnit.SECONDS.sleep(120);
    }

Using block(Duration) of Mono<ClientResponse > can also have an effect.

The output is as follows

21:22:12.039 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0xca842ea7, L:/127.0.0.1:49649 - R:localhost/127.0.0.1:8080] FLUSH
21:22:16.728 [main] DEBUG org.springframework.web.reactive.function.client - cancel()
java.lang.IllegalStateException: Timeout on blocking read for 5000 MILLISECONDS
    at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:110)
    at reactor.core.publisher.Mono.block(Mono.java:1186)
    at com.example.demo.WebClientTest.testBlockTimeout(WebClientTest.java:305)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
21:22:16.733 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0xca842ea7, L:/127.0.0.1:49649 - R:localhost/127.0.0.1:8080] CLOSE
21:22:16.737 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0xca842ea7, L:/127.0.0.1:49649 ! R:localhost/127.0.0.1:8080] INACTIVE
21:22:16.740 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0xca842ea7, L:/127.0.0.1:49649 ! R:localhost/127.0.0.1:8080] USER_EVENT: [Handler Terminated]
21:22:16.741 [reactor-http-nio-4] DEBUG reactor.ipc.netty.channel.ChannelOperationsHandler - [id: 0xca842ea7, L:/127.0.0.1:49649 ! R:localhost/127.0.0.1:8080] Disposing context reactor.ipc.netty.channel.PooledClientContextHandler@e3add1a
21:22:16.741 [reactor-http-nio-4] DEBUG reactor.ipc.netty.channel.PooledClientContextHandler - Releasing channel: [id: 0xca842ea7, L:/127.0.0.1:49649 ! R:localhost/127.0.0.1:8080]
21:22:16.741 [reactor-http-nio-4] DEBUG reactor.ipc.netty.resources.DefaultPoolResources - Released [id: 0xca842ea7, L:/127.0.0.1:49649 ! R:localhost/127.0.0.1:8080], now 0 active connections
21:22:16.742 [reactor-http-nio-4] DEBUG reactor.ipc.netty.http.client.HttpClient - [id: 0xca842ea7, L:/127.0.0.1:49649 ! R:localhost/127.0.0.1:8080] UNREGISTERED

Server side

Non-reactive

such as

    @GetMapping("/download")
    public ResponseEntity<Resource> resource() throws IOException, InterruptedException {
        Resource resource = new ClassPathResource("parallel.png");
        TimeUnit.SECONDS.sleep(30);
        return ResponseEntity.ok()
                .contentType(MediaType.IMAGE_PNG)
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=parallel.png")
                .body(resource);
    }

Output

2018-02-14 21:29:35.568 ERROR 9451 --- [ctor-http-nio-2] c.e.demo.exception.ExceptionHandlers     : Broken pipe

java.io.IOException: Broken pipe
    at sun.nio.ch.FileDispatcherImpl.write0(Native Method) ~[na:1.8.0_71]
    at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47) ~[na:1.8.0_71]
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93) ~[na:1.8.0_71]
    at sun.nio.ch.IOUtil.write(IOUtil.java:51) ~[na:1.8.0_71]
    at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471) ~[na:1.8.0_71]
    at sun.nio.ch.FileChannelImpl.transferToTrustedChannel(FileChannelImpl.java:515) ~[na:1.8.0_71]
    at sun.nio.ch.FileChannelImpl.transferTo(FileChannelImpl.java:611) ~[na:1.8.0_71]
    at io.netty.channel.DefaultFileRegion.transferTo(DefaultFileRegion.java:145) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.socket.nio.NioSocketChannel.doWriteFileRegion(NioSocketChannel.java:355) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.nio.AbstractNioByteChannel.doWrite(AbstractNioByteChannel.java:224) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:382) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:934) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:362) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:901) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.flush(DefaultChannelPipeline.java:1321) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.flush(CombinedChannelDuplexHandler.java:533) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.CombinedChannelDuplexHandler.flush(CombinedChannelDuplexHandler.java:358) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.ChannelDuplexHandler.flush(ChannelDuplexHandler.java:117) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at reactor.ipc.netty.channel.ChannelOperationsHandler.doWrite(ChannelOperationsHandler.java:294) ~[reactor-netty-0.7.2.RELEASE.jar:0.7.2.RELEASE]
    at reactor.ipc.netty.channel.ChannelOperationsHandler.drain(ChannelOperationsHandler.java:463) ~[reactor-netty-0.7.2.RELEASE.jar:0.7.2.RELEASE]
    at reactor.ipc.netty.channel.ChannelOperationsHandler.flush(ChannelOperationsHandler.java:183) ~[reactor-netty-0.7.2.RELEASE.jar:0.7.2.RELEASE]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:802) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:831) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1041) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:300) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at reactor.ipc.netty.NettyOutbound.lambda$sendFile$1(NettyOutbound.java:232) ~[reactor-netty-0.7.2.RELEASE.jar:0.7.2.RELEASE]
    at reactor.core.publisher.MonoUsing.subscribe(MonoUsing.java:81) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:148) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3008) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxConcatIterable$ConcatIterableSubscriber.onComplete(FluxConcatIterable.java:141) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxConcatIterable.subscribe(FluxConcatIterable.java:60) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3008) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:172) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:53) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3008) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:169) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:53) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1092) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:241) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:73) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:198) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:198) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1092) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenAcceptInner.onNext(MonoIgnoreThen.java:290) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:1649) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenAcceptInner.onSubscribe(MonoIgnoreThen.java:279) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:161) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:53) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:148) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:271) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:803) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:115) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:1649) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:156) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:1463) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onSubscribe(Operators.java:1337) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:90) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoMapFuseable.subscribe(MonoMapFuseable.java:59) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3008) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:418) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:210) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:128) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:61) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.FluxConcatMap.subscribe(FluxConcatMap.java:121) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3008) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:167) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) [reactor-core-3.1.2.RELEASE.jar:3.1.2.RELEASE]
    at reactor.ipc.netty.channel.ChannelOperations.applyHandler(ChannelOperations.java:383) [reactor-netty-0.7.2.RELEASE.jar:0.7.2.RELEASE]
    at reactor.ipc.netty.http.server.HttpServerOperations.onHandlerStart(HttpServerOperations.java:359) [reactor-netty-0.7.2.RELEASE.jar:0.7.2.RELEASE]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) ~[netty-common-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403) ~[netty-common-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463) ~[netty-transport-4.1.17.Final.jar:4.1.17.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) ~[netty-common-4.1.17.Final.jar:4.1.17.Final]
    at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_71]

It can be seen that the above two methods are only that the client side closes the channel itself, and the non-reactive server side finds out when it needs to output, and then throws java.io.IOException: Broken pipe

reactive

such as

    @GetMapping("/flux")
    public Flux<String> fluxReturn() throws InterruptedException {
        return Flux.just("1","2","3","4")
                .delayElements(Duration.ofSeconds(5))
                .doOnError(e -> {
                    System.out.println("error:"+e.getMessage());
                });
    }

Output

2018-02-14 21:59:59.956 DEBUG 9836 --- [ctor-http-nio-2] r.i.n.http.server.HttpServerOperations   : Increasing pending responses, now 1
2018-02-14 21:59:59.970 DEBUG 9836 --- [ctor-http-nio-2] r.ipc.netty.http.server.HttpServer       : [id: 0x85a11fcb, L:/127.0.0.1:8080 - R:/127.0.0.1:51936] READ COMPLETE
2018-02-14 21:59:59.970 DEBUG 9836 --- [ctor-http-nio-2] r.ipc.netty.channel.ChannelOperations    : [HttpServer] [id: 0x85a11fcb, L:/127.0.0.1:8080 - R:/127.0.0.1:51936] handler is being applied: org.springframework.http.server.reactive.ReactorHttpHandlerAdapter@6df6d7a5
2018-02-14 22:00:04.862 DEBUG 9836 --- [ctor-http-nio-2] r.ipc.netty.http.server.HttpServer       : [id: 0x85a11fcb, L:/127.0.0.1:8080 - R:/127.0.0.1:51936] READ COMPLETE
2018-02-14 22:00:04.868 DEBUG 9836 --- [ctor-http-nio-2] r.ipc.netty.http.server.HttpServer       : [id: 0x85a11fcb, L:/127.0.0.1:8080 ! R:/127.0.0.1:51936] INACTIVE
2018-02-14 22:00:04.868 DEBUG 9836 --- [ctor-http-nio-2] r.ipc.netty.http.server.HttpServer       : [id: 0x85a11fcb, L:/127.0.0.1:8080 ! R:/127.0.0.1:51936] USER_EVENT: [Handler Terminated]
2018-02-14 22:00:04.869 DEBUG 9836 --- [ctor-http-nio-2] r.i.n.channel.ChannelOperationsHandler   : [id: 0x85a11fcb, L:/127.0.0.1:8080 ! R:/127.0.0.1:51936] Disposing context reactor.ipc.netty.channel.ServerContextHandler@2a0abf15
2018-02-14 22:00:04.870 DEBUG 9836 --- [ctor-http-nio-2] r.ipc.netty.http.server.HttpServer       : [id: 0x85a11fcb, L:/127.0.0.1:8080 ! R:/127.0.0.1:51936] UNREGISTERED

The reactive server can sense the client’s terminate.

Summary

SO_TIMEOUT is only applicable to OIO, not NIO; Both ReadTimeoutHandler and block(Duration) are used to close the client side. Non-reactive servers cannot perceive Terminated, while reactive servers can perceive Terminated

doc