Clear ProducesRequestCondition attribute

Closes gh-23091

spring-webflux/src/main/java/org/springframework/web/reactive/result/condition/ProducesRequestCondition.java

@@ -320,6 +320,17 @@ public final class ProducesRequestCondition extends AbstractRequestCondition<Pro
 	}
 
 
+	/**
+	 * Use this to clear {@link #MEDIA_TYPES_ATTRIBUTE} that contains the parsed,
+	 * requested media types.
+	 * @param exchange the current exchange
+	 * @since 5.2
+	 */
+	public static void clearMediaTypesAttribute(ServerWebExchange exchange) {
+		exchange.getAttributes().remove(MEDIA_TYPES_ATTRIBUTE);
+	}
+
+
 	/**
 	 * Parses and matches a single media type expression to a request's 'Accept' header.
 	 */

spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/RequestMappingHandlerMapping.java

@@ -24,6 +24,8 @@ import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.function.Predicate;
 
+import reactor.core.publisher.Mono;
+
 import org.springframework.context.EmbeddedValueResolverAware;
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.core.annotation.MergedAnnotation;
@@ -43,9 +45,11 @@ import org.springframework.web.method.HandlerMethod;
 import org.springframework.web.reactive.accept.RequestedContentTypeResolver;
 import org.springframework.web.reactive.accept.RequestedContentTypeResolverBuilder;
 import org.springframework.web.reactive.result.condition.ConsumesRequestCondition;
+import org.springframework.web.reactive.result.condition.ProducesRequestCondition;
 import org.springframework.web.reactive.result.condition.RequestCondition;
 import org.springframework.web.reactive.result.method.RequestMappingInfo;
 import org.springframework.web.reactive.result.method.RequestMappingInfoHandlerMapping;
+import org.springframework.web.server.ServerWebExchange;
 
 /**
  * An extension of {@link RequestMappingInfoHandlerMapping} that creates
@@ -352,4 +356,10 @@ public class RequestMappingHandlerMapping extends RequestMappingInfoHandlerMappi
 		}
 	}
 
+	@Override
+	public Mono<HandlerMethod> getHandlerInternal(ServerWebExchange exchange) {
+		return super.getHandlerInternal(exchange)
+				.doOnTerminate(() -> ProducesRequestCondition.clearMediaTypesAttribute(exchange));
+	}
+
 }