java.lang.IllegalArgumentException: Invalid character '=' for QUERY_PARAM when parama is encoded

[florentm35]

Describe the bug When the caracters '=' is contained on query param, the gateway send an error :

Exemple url : http://localhost:9007/test?state=WTq0yXFG63hUwOLiWDCxjHagfnuj49K2YGF0cbdtu34%3D I don't understand the equals caracters are encoded (%3D)

java.lang.IllegalArgumentException: Invalid character '=' for QUERY_PARAM in "WTq0yXFG63hUwOLiWDCxjHagfnuj49K2YGF0cbdtu34="
	at org.springframework.web.util.HierarchicalUriComponents.verifyUriComponent(HierarchicalUriComponents.java:422) ~[spring-web-6.1.2.jar:6.1.2]
	at org.springframework.web.util.HierarchicalUriComponents.lambda$verify$4(HierarchicalUriComponents.java:390) ~[spring-web-6.1.2.jar:6.1.2]
	at org.springframework.util.UnmodifiableMultiValueMap.lambda$forEach$0(UnmodifiableMultiValueMap.java:114) ~[spring-core-6.1.2.jar:6.1.2]
	at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:986) ~[na:na]
	at org.springframework.util.MultiValueMapAdapter.forEach(MultiValueMapAdapter.java:179) ~[spring-core-6.1.2.jar:6.1.2]
	at org.springframework.util.UnmodifiableMultiValueMap.forEach(UnmodifiableMultiValueMap.java:114) ~[spring-core-6.1.2.jar:6.1.2]
	at org.springframework.web.util.HierarchicalUriComponents.verify(HierarchicalUriComponents.java:387) ~[spring-web-6.1.2.jar:6.1.2]
	at org.springframework.web.util.HierarchicalUriComponents.<init>(HierarchicalUriComponents.java:146) ~[spring-web-6.1.2.jar:6.1.2]
	at org.springframework.web.util.UriComponentsBuilder.buildInternal(UriComponentsBuilder.java:445) ~[spring-web-6.1.2.jar:6.1.2]
	at org.springframework.web.util.UriComponentsBuilder.build(UriComponentsBuilder.java:433) ~[spring-web-6.1.2.jar:6.1.2]
	at org.springframework.cloud.gateway.server.mvc.handler.ProxyExchangeHandlerFunction.handle(ProxyExchangeHandlerFunction.java:76) ~[spring-cloud-gateway-server-mvc-4.1.0.jar:4.1.0]
	at org.springframework.cloud.gateway.server.mvc.handler.HandlerFunctions$LookupProxyExchangeHandlerFunction.handle(HandlerFunctions.java:98) ~[spring-cloud-gateway-server-mvc-4.1.0.jar:4.1.0]
	at org.springframework.web.servlet.function.support.HandlerFunctionAdapter.handle(HandlerFunctionAdapter.java:107) ~[spring-webmvc-6.1.2.jar:6.1.2]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.2.jar:6.1.2]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.2.jar:6.1.2]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.2.jar:6.1.2]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.1.2.jar:6.1.2]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[tomcat-embed-core-10.1.17.jar:6.0]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.2.jar:6.1.2]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.17.jar:6.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	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-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	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-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.2.jar:6.1.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.2.jar:6.1.2]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.2.jar:6.1.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.2.jar:6.1.2]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.2.jar:6.1.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.2.jar:6.1.2]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:340) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-10.1.17.jar:10.1.17]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]

Sample

gateway (on port 9007) : (spring initializr)

@SpringBootApplication
public class DemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}

	@Configuration
	public static class GatewayConfiguration {

		@Bean
		public RouterFunction<ServerResponse> routerFunction() {
			return route()
					.GET("/test", http("http://localhost:9008"))
					.build();
		}
	}
}```