Springdoc breaks (Unexpected value: TRACE) when a spring-cloud-starter-gateway-mvc universal gateway is configured

[Interessierter]

Describe the bug

When a Spring Cloud Gateway MVC is configured for all HTTP methods the api-docs (and thus swagger UI) can not be loaded because springdoc somehow is also trying to analyze these routes. I tried to mitigate that by configuring springdoc.paths-to-exclude but it had no effect.

Stacktrace:

java.lang.IllegalStateException: Unexpected value: TRACE
	at org.springdoc.core.fn.RouterFunctionData.getRequestMethod(RouterFunctionData.java:289) ~[springdoc-openapi-starter-common-2.3.0.jar:2.3.0]
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[na:na]
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133) ~[na:na]
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1845) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:575) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:616) ~[na:na]
	at org.springdoc.core.fn.RouterFunctionData.getMethod(RouterFunctionData.java:258) ~[springdoc-openapi-starter-common-2.3.0.jar:2.3.0]
	at org.springdoc.core.fn.RouterFunctionData.setMethods(RouterFunctionData.java:182) ~[springdoc-openapi-starter-common-2.3.0.jar:2.3.0]
	at org.springdoc.core.fn.AbstractRouterFunctionVisitor.lambda$method$0(AbstractRouterFunctionVisitor.java:110) ~[springdoc-openapi-starter-common-2.3.0.jar:2.3.0]
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[na:na]
	at org.springdoc.core.fn.AbstractRouterFunctionVisitor.method(AbstractRouterFunctionVisitor.java:110) ~[springdoc-openapi-starter-common-2.3.0.jar:2.3.0]
	at org.springframework.web.servlet.function.RequestPredicates$HttpMethodPredicate.accept(RequestPredicates.java:555) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.function.RequestPredicates$AndRequestPredicate.accept(RequestPredicates.java:907) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springdoc.webmvc.core.providers.RouterFunctionWebMvcProvider$RouterFunctionVisitor.route(RouterFunctionWebMvcProvider.java:92) ~[springdoc-openapi-starter-webmvc-api-2.3.0.jar:2.3.0]
	at org.springframework.web.servlet.function.RouterFunctions$DefaultRouterFunction.accept(RouterFunctions.java:1067) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.function.RouterFunctionBuilder$BuiltRouterFunction.lambda$accept$0(RouterFunctionBuilder.java:418) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[na:na]
	at org.springframework.web.servlet.function.RouterFunctionBuilder$BuiltRouterFunction.accept(RouterFunctionBuilder.java:418) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.function.RouterFunctions$FilteredRouterFunction.accept(RouterFunctions.java:1029) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springdoc.webmvc.core.providers.RouterFunctionWebMvcProvider.getRouterFunctionPaths(RouterFunctionWebMvcProvider.java:73) ~[springdoc-openapi-starter-webmvc-api-2.3.0.jar:2.3.0]
	at org.springdoc.webmvc.api.OpenApiResource.lambda$getPaths$6(OpenApiResource.java:183) ~[springdoc-openapi-starter-webmvc-api-2.3.0.jar:2.3.0]
	at java.base/java.util.Optional.ifPresent(Optional.java:178) ~[na:na]
	at org.springdoc.webmvc.api.OpenApiResource.getPaths(OpenApiResource.java:183) ~[springdoc-openapi-starter-webmvc-api-2.3.0.jar:2.3.0]
	at org.springdoc.api.AbstractOpenApiResource.getOpenApi(AbstractOpenApiResource.java:353) ~[springdoc-openapi-starter-common-2.3.0.jar:2.3.0]
	at org.springdoc.webmvc.api.OpenApiResource.openapiJson(OpenApiResource.java:124) ~[springdoc-openapi-starter-webmvc-api-2.3.0.jar:2.3.0]
	at org.springdoc.webmvc.api.OpenApiWebMvcResource.openapiJson(OpenApiWebMvcResource.java:111) ~[springdoc-openapi-starter-webmvc-api-2.3.0.jar:2.3.0]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:261) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:189) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:917) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:829) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[tomcat-embed-core-10.1.18.jar:6.0]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.18.jar:6.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.cloud.gateway.server.mvc.filter.WeightCalculatorFilter.doFilter(WeightCalculatorFilter.java:229) ~[spring-cloud-gateway-server-mvc-4.1.0.jar:4.1.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.cloud.gateway.server.mvc.filter.FormFilter.doFilter(FormFilter.java:97) ~[spring-cloud-gateway-server-mvc-4.1.0.jar:4.1.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:340) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]

To Reproduce
just run the attached minimal example project and visit http://localhost:8080/swagger-ui/index.html

• What version of spring-boot you are using?
  latest (3.2.2)

• What modules and versions of springdoc-openapi are you using?
  latest (springdoc-openapi-starter-webmvc-ui v2.3.0)

• What is the actual and the expected result using OpenAPI Description (yml or json)?

actual result: no OpenAPI definition is generated
expected result: OpenAPI definition is generated

see attached example project, can easily be reproduced. Problem arises because I want to proxy all HTTP method (see GatewayConfiguration line 20)

Expected behavior

Springdoc should work just fine with TRACE gateway routes. If there is a reason to not support HTTP TRACE (did not investigate, most likely because it isnt included in that explizit check in the stacktrace above) it should be possible to exclude such paths by configuration (springdoc.paths-to-exclude would be a natural fit for this IMHO)

Screenshots
n/a

Additional context

gateway-springdoc.zip