Spring Cloud Gateway 出现POST请求获取Body报错问题

报错信息：

java.lang.IllegalArgumentException: Unable to handle DataBuffer of type class org.springframework.http.server.reactive.UndertowServerHttpRequest$UndertowDataBuffer at org.springframework.cloud.gateway.filter.NettyRoutingFilter.getByteBuf(NettyRoutingFilter.java:219) at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:100) at org.springframework.http.server.reactive.AbstractListenerReadPublisher.readAndPublish(AbstractListenerReadPublisher.java:196) at org.springframework.http.server.reactive.AbstractListenerReadPublisher.access$1100(AbstractListenerReadPublisher.java:48) at org.springframework.http.server.reactive.AbstractListenerReadPublisher$State$4.onDataAvailable(AbstractListenerReadPublisher.java:374) at org.springframework.http.server.reactive.AbstractListenerReadPublisher.onDataAvailable(AbstractListenerReadPublisher.java:118) at org.springframework.http.server.reactive.UndertowServerHttpRequest$RequestBodyPublisher.checkOnDataAvailable(UndertowServerHttpRequest.java:168) at org.springframework.http.server.reactive.AbstractListenerReadPublisher.changeToDemandState(AbstractListenerReadPublisher.java:222) at org.springframework.http.server.reactive.AbstractListenerReadPublisher.access$1000(AbstractListenerReadPublisher.java:48) at org.springframework.http.server.reactive.AbstractListenerReadPublisher$State$2.request(AbstractListenerReadPublisher.java:333) at org.springframework.http.server.reactive.AbstractListenerReadPublisher$ReadSubscription.request(AbstractListenerReadPublisher.java:260) at reactor.core.publisher.FluxMap$MapSubscriber.request(FluxMap.java:155) at reactor.netty.channel.MonoSendMany$SendManyInner.onSubscribe(MonoSendMany.java:250) at reactor.core.publisher.FluxMap$MapSubscriber.onSubscribe(FluxMap.java:86) at org.springframework.http.server.reactive.AbstractListenerReadPublisher$State$1.subscribe(AbstractListenerReadPublisher.java:301) at org.springframework.http.server.reactive.AbstractListenerReadPublisher.subscribe(AbstractListenerReadPublisher.java:105) at reactor.core.publisher.FluxSource.subscribe(FluxSource.java:65) at reactor.core.publisher.Flux.subscribe(Flux.java:8358) at reactor.netty.channel.MonoSendMany.subscribe(MonoSendMany.java:102) at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:234) at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onComplete(MonoIgnoreThen.java:201) at reactor.core.publisher.Operators.complete(Operators.java:135) at reactor.netty.FutureMono$DeferredFutureMono.subscribe(FutureMono.java:130) at reactor.core.publisher.Mono.subscribe(Mono.java:4252) at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:253) at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51) at reactor.core.publisher.Mono.subscribe(Mono.java:4252) at reactor.netty.NettyOutbound.subscribe(NettyOutbound.java:336) at reactor.core.publisher.MonoSource.subscribe(MonoSource.java:65) at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)

排查现场：

目前Spring Gateway的版本2.2.8版本，Spring Cloud 使用Hoxton.SR11版本

查了些资料都说是，新版的Gateway都存在【post/put请求获取不到Body的问题】

但是get/delete是正常

采用大牛的解决方案：blog.csdn.net/qq_38225558… 也能解决这个问题

但是我认为这个不是最根本的解决方案，而且这样处理后我在后期出现了一些新的其他问题

后来通过分析，Unable to handle DataBuffer of type class org.springframework.http.server.reactive.UndertowServerHttpRequest$UndertowDataBuffer

会不会是WEB容器Undertow自身的问题，其他容器有可能没得这个问题呢？

初步解决方案：

将Undertow容器修改为Tomcat容器

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
    </dependency>
    

然后尝试下，发现问题消失的无影无踪了

总结：

Spring新版本的啊，总是伴随着这种或那种问题，特别磨人，在项目中谨慎升级最新版本