原 java.lang.IllegalArgumentException: When allowCredentials is true, allowedOrigins cannot contain the

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一：我们spring cloud 设置跨域时遇到如下的错误

java.lang.IllegalArgumentException: When allowCredentials is true, allowedOrigins cannot contain the special value "*"since that cannot be set on the "Access-Control-Allow-Origin" response header. To allow credentials to a set of origins, list them explicitly or consider using "allowedOriginPatterns" instead.
	at org.springframework.web.cors.CorsConfiguration.validateAllowCredentials(CorsConfiguration.java:453) ~[spring-web-5.3.3.jar:5.3.3]
	Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
	|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ HTTP OPTIONS "/api/sys/login" [ExceptionHandlingWebHandler]
Stack trace:
		at org.springframework.web.cors.CorsConfiguration.validateAllowCredentials(CorsConfiguration.java:453) ~[spring-web-5.3.3.jar:5.3.3]
		at org.springframework.web.cors.CorsConfiguration.checkOrigin(CorsConfiguration.java:557) ~[spring-web-5.3.3.jar:5.3.3]
		at org.springframework.web.cors.reactive.DefaultCorsProcessor.checkOrigin(DefaultCorsProcessor.java:172) ~[spring-web-5.3.3.jar:5.3.3]
		at org.springframework.web.cors.reactive.DefaultCorsProcessor.handleInternal(DefaultCorsProcessor.java:117) ~[spring-web-5.3.3.jar:5.3.3]
		at org.springframework.web.cors.reactive.DefaultCorsProcessor.process(DefaultCorsProcessor.java:96) ~[spring-web-5.3.3.jar:5.3.3]
		at org.springframework.web.cors.reactive.CorsWebFilter.filter(CorsWebFilter.java:79) ~[spring-web-5.3.3.jar:5.3.3]
		at org.springframework.web.server.handler.DefaultWebFilterChain.invokeFilter(DefaultWebFilterChain.java:127) ~[spring-web-5.3.3.jar:5.3.3]
		at org.springframework.web.server.handler.DefaultWebFilterChain.lambda$filter$0(DefaultWebFilterChain.java:121) ~[spring-web-5.3.3.jar:5.3.3]
		at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) [reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.Mono.subscribe(Mono.java:4046) ~[reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:173) ~[reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.4.2.jar:3.4.2]
		at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.2.jar:3.4.2]
		at reactor.netty.http.server.HttpServer$HttpServerHandle.onStateChange(HttpServer.java:860) ~[reactor-netty-http-1.0.3.jar:1.0.3]
		at reactor.netty.ReactorNetty$CompositeConnectionObserver.onStateChange(ReactorNetty.java:638) ~[reactor-netty-core-1.0.3.jar:1.0.3]
		at reactor.netty.transport.ServerTransport$ChildObserver.onStateChange(ServerTransport.java:475) ~[reactor-netty-core-1.0.3.jar:1.0.3]
		at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:525) ~[reactor-netty-http-1.0.3.jar:1.0.3]
		at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:94) ~[reactor-netty-core-1.0.3.jar:1.0.3]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:209) ~[reactor-netty-http-1.0.3.jar:1.0.3]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) ~[netty-codec-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296) ~[netty-codec-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[netty-common-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.58.Final.jar:4.1.58.Final]
		at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.58.Final.jar:4.1.58.Final]
		at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_291]

二：解决办法

将addAllowedOrigin("*")改成addAllowedOriginPattern("*")即可

完整的跨域代码如下：

spring cloud解决跨域问题：https://www.91mszl.com/zhangwuji/article/details/1390

spring boot 解决跨域问题：https://www.91mszl.com/zhangwuji/article/details/1055