谷粒商城实战笔记-跨域问题

一，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.

1，错误信息

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:473) ~[spring-web-5.3.23.jar:5.3.23]Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):*__checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]*__checkpoint ⇢ HTTP OPTIONS "/api/sys/login" [ExceptionHandlingWebHandler]
Original Stack Trace:at org.springframework.web.cors.CorsConfiguration.validateAllowCredentials(CorsConfiguration.java:473) ~[spring-web-5.3.23.jar:5.3.23]at org.springframework.web.cors.CorsConfiguration.checkOrigin(CorsConfiguration.java:577) ~[spring-web-5.3.23.jar:5.3.23]at org.springframework.web.cors.reactive.DefaultCorsProcessor.checkOrigin(DefaultCorsProcessor.java:172) ~[spring-web-5.3.23.jar:5.3.23]at org.springframework.web.cors.reactive.DefaultCorsProcessor.handleInternal(DefaultCorsProcessor.java:117) ~[spring-web-5.3.23.jar:5.3.23]at org.springframework.web.cors.reactive.DefaultCorsProcessor.process(DefaultCorsProcessor.java:96) ~[spring-web-5.3.23.jar:5.3.23]at org.springframework.web.cors.reactive.CorsWebFilter.filter(CorsWebFilter.java:79) ~[spring-web-5.3.23.jar:5.3.23]at org.springframework.web.server.handler.DefaultWebFilterChain.invokeFilter(DefaultWebFilterChain.java:127) ~[spring-web-5.3.23.jar:5.3.23]at org.springframework.web.server.handler.DefaultWebFilterChain.lambda$filter$0(DefaultWebFilterChain.java:121) ~[spring-web-5.3.23.jar:5.3.23]at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) ~[reactor-core-3.4.24.jar:3.4.24]at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.24.jar:3.4.24]at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) ~[reactor-core-3.4.24.jar:3.4.24]at reactor.core.publisher.Mono.subscribe(Mono.java:4455) ~[reactor-core-3.4.24.jar:3.4.24]at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:263) ~[reactor-core-3.4.24.jar:3.4.24]at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51) ~[reactor-core-3.4.24.jar:3.4.24]at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.24.jar:3.4.24]at reactor.core.publisher.MonoDeferContextual.subscribe(MonoDeferContextual.java:55) ~[reactor-core-3.4.24.jar:3.4.24]at reactor.netty.http.server.HttpServer$HttpServerHandle.onStateChange(HttpServer.java:993) ~[reactor-netty-http-1.0.24.jar:1.0.24]at reactor.netty.ReactorNetty$CompositeConnectionObserver.onStateChange(ReactorNetty.java:677) ~[reactor-netty-core-1.0.24.jar:1.0.24]at reactor.netty.transport.ServerTransport$ChildObserver.onStateChange(ServerTransport.java:477) ~[reactor-netty-core-1.0.24.jar:1.0.24]at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:573) ~[reactor-netty-http-1.0.24.jar:1.0.24]at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:113) ~[reactor-netty-core-1.0.24.jar:1.0.24]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:220) ~[reactor-netty-http-1.0.24.jar:1.0.24]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:336) ~[netty-codec-4.1.84.Final.jar:4.1.84.Final]at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:308) ~[netty-codec-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) ~[netty-transport-4.1.84.Final.jar:4.1.84.Final]at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.84.Final.jar:4.1.84.Final]at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.84.Final.jar:4.1.84.Final]at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.84.Final.jar:4.1.84.Final]at java.base/java.lang.Thread.run(Thread.java:842) ~[na:na]2024-07-22 17:07:53.302 ERROR 4804 --- [ctor-http-nio-2] a.w.r.e.AbstractErrorWebExceptionHandler : [ca4ea7bb-2]  500 Server Error for HTTP OPTIONS "/api/sys/login"

2，问题原因：

SpringBoot升级2.4.0+之后，跨域配置中的.allowedOrigins不再可用

3，解决办法：

将配置中的.allowedOrigins替换成.allowedOriginPatterns即可。

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二，Access to XMLHttpRequest at ‘http://localhost:88/api/sys/login’ from origin ‘http://localhost:8001’ has been blocked by CORS policy: The ‘Access-Control-Allow-Origin’ header contains multiple values ‘http://localhost:8001, http://localhost:8001’, but only one is allowed.

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这个错误的原因是在网关和后台服务都配置了允许跨域。

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导致正式发送请求时有两个相同的header头，配置重复。

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该错误信息指出，XMLHttpRequest 请求从 http://localhost:8001 发起到 http://localhost:88/api/sys/login 的跨域请求时，被CORS策略阻止。具体的问题在于 Access-Control-Allow-Origin 响应头包含了多个值 'http://localhost:8001,http://localhost:8001'，但是CORS规范要求这个头部只能包含一个值。

这种错误通常是由以下情况引起的：

重复设置响应头：