使用 RouteLocatorBuilder 调用资源 URL 时引发 UnknownHostException

Question

我必须使用 spring-云网关。我在配置一个简单的 spring-boot 项目时遇到了一些麻烦 https://spring.io/guides/gs/gateway/

@SpringBootApplication
@RestController
public class MarouteApplication {

    @Bean
    public RouteLocator maRoute(RouteLocatorBuilder builder) {
        return builder.routes()
                .route(p -> p
                        .path("/get")
                        .filters(f -> f.addRequestHeader("Hello", "World"))
                        .uri("http://httpbin.org:80"))
                .route(p -> p
                        .path("/bling")
                        .uri("http://localhost:9090/test"))
                .build();
    }

    @GetMapping(value = "/test")
    public ResponseEntity<String> getPerso() throws Exception {
        return ResponseEntity.ok("{\"value\":\"OK\"}");
    }

    public static void main(String[] args) {
        SpringApplication.run(MarouteApplication.class, args);
    }

}

application.yaml

spring:
  cloud:
    gateway:
      proxy:
        host: %MY_PROXY_BUT_ITS_HIDDEN%
        port: 8080
      routes:
        - id: rewritepath_route
          uri: http://example.org
          predicates:
            - Path=/foo/**

management:
  endpoints:
    web:
      exposure:
        include: '*'
  metrics:
    web:
      server:
        auto-time-requests: true
server:
  port: 9090

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example.maroute</groupId>
    <artifactId>maroute</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>maroute</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

所以我有三个路由，两个是通过 RouteLocatorBuilder 配置的。还有一个是通过 application.yaml.

配置的

端点 http://localhost:9090/test 有效。

对于路由 /get 我得到：

2019-09-09 16:06:46.026 ERROR 5469 --- [or-http-epoll-3] a.w.r.e.AbstractErrorWebExceptionHandler : [95d74b07] 500 Server Error for HTTP GET "/get"

java.net.UnknownHostException: httpbin.org
    at java.base/java.net.InetAddress$CachedAddresses.get(InetAddress.java:797) ~[na:na]
    at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1505) ~[na:na]
    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1364) ~[na:na]
    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1298) ~[na:na]
    at java.base/java.net.InetAddress.getByName(InetAddress.java:1248) ~[na:na]
    at io.netty.util.internal.SocketUtils.run(SocketUtils.java:146) ~[netty-common-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.util.internal.SocketUtils.run(SocketUtils.java:143) ~[netty-common-4.1.39.Final.jar:4.1.39.Final]
    at java.base/java.security.AccessController.doPrivileged(Native Method) ~[na:na]
    at io.netty.util.internal.SocketUtils.addressByName(SocketUtils.java:143) ~[netty-common-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.resolver.DefaultNameResolver.doResolve(DefaultNameResolver.java:43) ~[netty-resolver-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:63) ~[netty-resolver-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:55) ~[netty-resolver-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:57) ~[netty-resolver-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:32) ~[netty-resolver-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.resolver.AbstractAddressResolver.resolve(AbstractAddressResolver.java:108) ~[netty-resolver-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.bootstrap.Bootstrap.doResolveAndConnect0(Bootstrap.java:204) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.bootstrap.Bootstrap.doResolveAndConnect(Bootstrap.java:166) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:120) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.pool.SimpleChannelPool.connectChannel(SimpleChannelPool.java:263) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.pool.SimpleChannelPool.acquireHealthyFromPoolOrNew(SimpleChannelPool.java:175) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.pool.SimpleChannelPool.acquire(SimpleChannelPool.java:160) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at reactor.netty.resources.PooledConnectionProvider$Pool.acquire(PooledConnectionProvider.java:258) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at reactor.netty.resources.PooledConnectionProvider$Pool.acquire(PooledConnectionProvider.java:252) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at reactor.netty.resources.PooledConnectionProvider.disposableAcquire(PooledConnectionProvider.java:204) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at reactor.netty.resources.PooledConnectionProvider.lambda$acquire(PooledConnectionProvider.java:162) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at reactor.core.publisher.MonoCreate.subscribe(MonoCreate.java:57) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.netty.http.client.HttpClientConnect$MonoHttpConnect.lambda$subscribe[=14=](HttpClientConnect.java:327) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at reactor.core.publisher.MonoCreate.subscribe(MonoCreate.java:57) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3858) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxRetryPredicate$RetryPredicateSubscriber.resubscribe(FluxRetryPredicate.java:123) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoRetryPredicate.subscribe(MonoRetryPredicate.java:51) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.netty.http.client.HttpClientConnect$MonoHttpConnect.subscribe(HttpClientConnect.java:330) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at reactor.core.publisher.MonoFlatMapMany.subscribe(MonoFlatMapMany.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Flux.subscribe(Flux.java:7923) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoPeek.subscribe(MonoPeek.java:71) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3858) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDoFinally.subscribe(MonoDoFinally.java:47) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3858) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:275) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:849) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1515) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:144) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:275) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:849) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:73) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxPeek$PeekSubscriber.onNext(FluxPeek.java:192) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1515) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onNext(MonoFilterWhen.java:140) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2071) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onSubscribe(MonoFilterWhen.java:103) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoFilterWhen.subscribe(MonoFilterWhen.java:56) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoPeek.subscribe(MonoPeek.java:71) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3858) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:442) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onNext(FluxConcatMap.java:244) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:114) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:42) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxIterable$IterableSubscription.slowPath(FluxIterable.java:243) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:201) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.request(FluxDematerialize.java:157) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:229) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onSubscribe(FluxDematerialize.java:88) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:139) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:63) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxDematerialize.subscribe(FluxDematerialize.java:39) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxDefer.subscribe(FluxDefer.java:54) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap.subscribe(FluxConcatMap.java:121) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoMap.subscribe(MonoMap.java:55) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoMap.subscribe(MonoMap.java:55) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3858) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:442) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:212) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:139) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:63) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.FluxConcatMap.subscribe(FluxConcatMap.java:121) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3858) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:70) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) ~[reactor-core-3.2.12.RELEASE.jar:3.2.12.RELEASE]
    at reactor.netty.http.server.HttpServerHandle.onStateChange(HttpServerHandle.java:64) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at reactor.netty.tcp.TcpServerBind$ChildObserver.onStateChange(TcpServerBind.java:226) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:442) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:91) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:161) ~[reactor-netty-0.8.11.RELEASE.jar:0.8.11.RELEASE]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:328) ~[netty-codec-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:302) ~[netty-codec-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1421) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930) ~[netty-transport-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:794) ~[netty-transport-native-epoll-4.1.39.Final-linux-x86_64.jar:4.1.39.Final]
    at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:424) ~[netty-transport-native-epoll-4.1.39.Final-linux-x86_64.jar:4.1.39.Final]
    at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:326) ~[netty-transport-native-epoll-4.1.39.Final-linux-x86_64.jar:4.1.39.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.run(SingleThreadEventExecutor.java:918) ~[netty-common-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.util.internal.ThreadExecutorMap.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.39.Final.jar:4.1.39.Final]
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.39.Final.jar:4.1.39.Final]
    at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]

我在 /foo 路由上遇到了同样的错误：

2019-09-09 16:07:58.830 ERROR 5469 --- [or-http-epoll-3] a.w.r.e.AbstractErrorWebExceptionHandler : [95d74b07] 500 Server Error for HTTP GET "/foo"

java.net.UnknownHostException: example.org
    at java.base/java.net.InetAddress$CachedAddresses.get(InetAddress.java:797) ~[na:na]
    at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1505) ~[na:na]
    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1364) ~[na:na]
    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1298) ~[na:na]
    at java.base/java.net.InetAddress.getByName(InetAddress.java:1248) ~[na:na]

对于 /bling 路由，我收到 413 代码错误（请求实体太大）

我怀疑我的代理不允许外部站点，所以我在 application.yaml 中配置它。结果不变。

如果有人有任何想法

Answer 1

由于我的专业环境不允许，所以我无法访问外部网站。在其他计算机（比如我个人的计算机）中，它可以正常工作。

如果我重定向到其他本地端点，则路由有效。您不能重新路由到解释 413 错误的同一端口端点。所以我在另一个端口上启动了 new API 并且它正在工作。重要的是要知道这条路线：

    @Bean
    public RouteLocator maRoute(RouteLocatorBuilder builder) {
        return builder.routes()
                .route(p -> p
                        .path("/foo")
                        .uri("http://localhost:8080/test"))
                .build();
    }

路线重定向到http://localhost:8080/foo 因此，如果您在 http:localhost:8080/foo 中没有端点，您将得到 404。您可以使用多种方式重定向到 8080/test，例如：

    @Bean
    public RouteLocator maRoute(RouteLocatorBuilder builder) {
        return builder.routes()
                .route(p -> p
                        .path("/test")
                        .uri("http://localhost:8080"))
                .build();
    }

或者如果你想使用 /foo 端点保持重定向

    @Bean
    public RouteLocator maRoute(RouteLocatorBuilder builder) {
        return builder.routes()
                .route(p -> p
                        .path("/foo")
                        .filters(f -> f.rewritePath("/foo", "/test"))
                        .uri("http://localhost:8080"))
                .build();
    }

此外，如果您想知道您的路由是否重定向到您真正期望的内容，您可以在 application.yaml 或属性中配置日志记录级别：

logging:
  level:
    org.springframework.cloud.gateway: TRACE
    org.springframework.http.server.reactive: DEBUG
    org.springframework.web.reactive: DEBUG
    reactor.ipc.netty: DEBUG
    reactor.netty: DEBUG

使用 RouteLocatorBuilder 调用资源 URL 时引发 UnknownHostException

UnknownHostException raised on calling ressource URL with RouteLocatorBuilder

spring-boot

spring-cloud-gateway