general: properly cleanup once the request is done (#19025)

wcs/middleware.py

@@ -104,6 +104,12 @@ class PublisherInitialisationMiddleware(object):
                     response[name] = value
                 return response
 
+    def process_response(self, request, response):
+        pub = get_publisher()
+        if pub:
+            pub.cleanup()
+        return response
+
 
 class AfterJobsMiddleware(object):
     ASYNC = True