BEST_MATCHING_HANDLER_ATTRIBUTE for spring-webmvc

Issue: SPR-17518

spring-webmvc/src/main/java/org/springframework/web/servlet/HandlerMapping.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -55,6 +55,13 @@ import org.springframework.lang.Nullable;
  */
 public interface HandlerMapping {
 
+	/**
+	 * Name of the {@link HttpServletRequest} attribute that contains the mapped
+	 * handler for the best matching pattern.
+	 * @since 5.1.3
+	 */
+	String BEST_MATCHING_HANDLER_ATTRIBUTE = HandlerMapping.class.getName() + ".bestMatchingHandler";
+
 	/**
 	 * Name of the {@link HttpServletRequest} attribute that contains the path
 	 * within the handler mapping, in case of a pattern match, or the full

spring-webmvc/src/main/java/org/springframework/web/servlet/handler/AbstractHandlerMethodMapping.java

@@ -414,6 +414,7 @@ public abstract class AbstractHandlerMethodMapping<T> extends AbstractHandlerMap
 							"Ambiguous handler methods mapped for '" + uri + "': {" + m1 + ", " + m2 + "}");
 				}
 			}
+			request.setAttribute(BEST_MATCHING_HANDLER_ATTRIBUTE, bestMatch.handlerMethod);
 			handleMatch(bestMatch.mapping, lookupPath, request);
 			return bestMatch.handlerMethod;
 		}

spring-webmvc/src/main/java/org/springframework/web/servlet/handler/AbstractUrlHandlerMapping.java

@@ -411,6 +411,7 @@ public abstract class AbstractUrlHandlerMapping extends AbstractHandlerMapping i
 		@Override
 		public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
 			exposePathWithinMapping(this.bestMatchingPattern, this.pathWithinMapping, request);
+			request.setAttribute(BEST_MATCHING_HANDLER_ATTRIBUTE, handler);
 			request.setAttribute(INTROSPECT_TYPE_LEVEL_MAPPING, supportsTypeLevelMappings());
 			return true;
 		}