Return 'cache' property in answer_dict

lib/adapter/adapter.py

@@ -145,6 +145,7 @@ class Adapter(with_metaclass(AdapterMC, object)):
             'topic': topic,
             'topic_type': self._adapter_name,
             'format': self._get_output_format(topic),
+            'cache': self._cache_needed,
             }
         answer_dict.update(answer)
 

lib/adapter/upstream.py

@@ -58,7 +58,7 @@ class UpstreamAdapter(Adapter):
                 + "?" + options_string
         try:
             response = requests.get(url, timeout=CONFIG["upstream.timeout"])
-            answer = response.text
+            answer = {"cache": False, "answer": response.text}
         except requests.exceptions.ConnectionError:
             answer = {"cache": False, "answer":_are_you_offline()}
         return answer

lib/routing.py

@@ -182,7 +182,8 @@ class Router(object):
                     }
 
             answer = self._get_page_dict(topic, topic_type, request_options=request_options)
-            cache.put('q:' + topic, answer)
+            if answer.get("cache", True):
+                cache.put('q:' + topic, answer)
             return answer
 
         # Try to find cacheable queries in the cache.