Merge pull request rails#54515 from byroot/lazy-route-pattern

Stop eagerly computing `request.route_uri_pattern`

Author: byroot

actionpack/lib/action_dispatch/http/request.rb

@@ -157,11 +157,16 @@ def request_method
     #
     #     request.route_uri_pattern # => "/:controller(/:action(/:id))(.:format)"
     def route_uri_pattern
-      get_header("action_dispatch.route_uri_pattern")
+      unless pattern = get_header("action_dispatch.route_uri_pattern")
+        route = get_header("action_dispatch.route")
+        pattern = route.path.spec.to_s
+        set_header("action_dispatch.route_uri_pattern", pattern)
+      end
+      pattern
     end
 
-    def route_uri_pattern=(pattern) # :nodoc:
-      set_header("action_dispatch.route_uri_pattern", pattern)
+    def route=(route) # :nodoc:
+      set_header("action_dispatch.route", route)
     end
 
     def routes # :nodoc:

actionpack/lib/action_dispatch/journey/router.rb

@@ -43,7 +43,7 @@ def serve(req)
           }
 
           req.path_parameters = tmp_params
-          req.route_uri_pattern = route.path.spec.to_s
+          req.route = route
 
           _, headers, _ = response = route.app.serve(req)