corrected encoding after enabling ignore-cache route param

inventory_provider/routes/msr.py

 import itertools
 import json
 
-from flask import Blueprint, jsonify, Response, request
+from flask import Blueprint, Response, request
 
 from inventory_provider.routes import common
 from inventory_provider.routes.common import _ignore_cache_or_retrieve
@@ -110,16 +110,18 @@ def access_services():
 
     if not result:
         result = list(_services())
-        # cache this data for the next call
-        redis.set(cache_key, json.dumps(result).encode('utf-8'))
 
-    if not result:
-        return Response(
-            response='no access services found',
-            status=404,
-            mimetype="text/html")
+        if not result:
+            return Response(
+                response='no access services found',
+                status=404,
+                mimetype="text/html")
+
+        # cache this data for the next call
+        result = json.dumps(result)
+        redis.set(cache_key, result.encode('utf-8'))
 
-    return jsonify(result)
+    return Response(result, mimetype="application/json")
 
 
 def _handle_peering_group_request(name, cache_key, group_key_base):
@@ -163,21 +165,21 @@ def _handle_peering_group_request(name, cache_key, group_key_base):
 
     if not items:
         if name:
-            items = _load_list_items(f'{group_key_base}:{name}')
+            items = list(_load_list_items(f'{group_key_base}:{name}'))
         else:
             gen_list = list(map(_load_list_items, _get_all_subkeys()))
-            items = itertools.chain(*gen_list)
+            items = list(itertools.chain(*gen_list))
 
-        items = list(items)
         if not items:
             return Response(
                 response='no peerings found',
                 status=404,
                 mimetype="text/html")
+        items = json.dumps(items)
 
-        r.set(cache_key, json.dumps(items).encode('utf-8'))
+        r.set(cache_key, items.encode('utf-8'))
 
-    return jsonify(items)
+    return Response(items, mimetype="application/json")
 
 
 @routes.route("/bgp/logical-system-peerings", methods=['GET', 'POST'])
@@ -272,11 +274,11 @@ def _handle_peering_group_list_request(cache_key, group_key_base):
                 response='no groups found',
                 status=404,
                 mimetype="text/html")
-        names = sorted(names)
+        names = json.dumps(sorted(names))
 
-        r.set(cache_key, json.dumps(names).encode('utf-8'))
+        r.set(cache_key, names.encode('utf-8'))
 
-    return jsonify(names)
+    return Response(names, mimetype="application/json")
 
 
 @routes.route("/bgp/logical-systems", methods=['GET', 'POST'])