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spring-cloud-gateway下游服务缺失

发表于 更新于

SpringCloud版本为：Version: Finchley.RELEASE

当在通过网关访问下游服务的时候，下游服务的返回头中缺失Content-Type字段会导致网关出现空指针异常

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java.lang.NullPointerException: null
	at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011) ~[na:1.8.0_144]
	at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1006) ~[na:1.8.0_144]
	at org.springframework.cloud.gateway.filter.NettyRoutingFilter.lambda$filter$3(NettyRoutingFilter.java:117) ~[spring-cloud-gateway-core-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at reactor.core.publisher.FluxPeek$PeekSubscriber.onNext(FluxPeek.java:177) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
	at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:108) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
	at reactor.core.publisher.FluxRetryPredicate$RetryPredicateSubscriber.onNext(FluxRetryPredicate.java:81) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
	at reactor.core.publisher.MonoCreate$DefaultMonoSink.success(MonoCreate.java:146) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
	at reactor.ipc.netty.channel.PooledClientContextHandler.fireContextActive(PooledClientContextHandler.java:85) ~[reactor-netty-0.7.8.RELEASE.jar:0.7.8.RELEASE]
	at reactor.ipc.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:578) ~[reactor-netty-0.7.8.RELEASE.jar:0.7.8.RELEASE]

原因是由于在NettyRoutingFilter这个过滤器中，会从下游服务中取出Content-Type塞到attribute中，由于ConcurrencyHashMap不允许值为空，所以当执行put的时候会导致NPE异常

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exchange.getAttributes().put("original_response_content_type", headers.getContentType());

然后作者在2.0.1这个版本才修复了这个问题

所以只能够升级版本或者在下游服务返回值中硬塞进去Content-Type