Provide the matched PathPattern as a request attribute in MVC

[wilkinsona]

On the WebMvc side, the PathPattern's pattern string is made available as a request attribute:

spring-framework/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/RequestMappingInfoHandlerMapping.java

Line 174 in c1d4a76

request.setAttribute(BEST_MATCHING_PATTERN_ATTRIBUTE, bestPattern.getPatternString());

On the WebFlux side, the PathPattern itself is available:

spring-framework/spring-webflux/src/main/java/org/springframework/web/reactive/handler/AbstractUrlHandlerMapping.java

Line 167 in c1d4a76

exchange.getAttributes().put(BEST_MATCHING_PATTERN_ATTRIBUTE, pattern);

Could a new attribute be introduced on the MVC side that exposes the PathPattern?

If we had the PathPattern on the MVC side, I think we could rework this WebMvc-based code in Boot to match more closely to its WebFlux-based equivalent.

[Eymenonar]

I'd like to work on this. I'll add focused MVC coverage for exposing the matched PathPattern as a request attribute.