Allow configuring the status codes CacheController tries to cache.

Author: elnuno

cachecontrol/controller.py

@@ -220,15 +220,16 @@ def conditional_headers(self, request):
 
         return new_headers
 
-    def cache_response(self, request, response, body=None):
+    def cache_response(self, request, response, body=None,
+                       cacheable_status_codes=None):
         """
         Algorithm for caching requests.
 
         This assumes a requests Response object.
         """
         # From httplib2: Don't cache 206's since we aren't going to
         #                handle byte range requests
-        cacheable_status_codes = [200, 203, 300, 301]
+        cacheable_status_codes = cacheable_status_codes or (200, 203, 300, 301)
         if response.status not in cacheable_status_codes:
             logger.debug(
                 'Status code %s not in %s',