Update settings.py

mi_web/settings.py

@@ -9,7 +9,7 @@ https://docs.djangoproject.com/en/3.1/topics/settings/
 For the full list of settings and their values, see
 https://docs.djangoproject.com/en/3.1/ref/settings/
 """
-
+import os
 from pathlib import Path
 
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
@@ -127,7 +127,7 @@ CHANNEL_LAYERS = {
     "default": {
         "BACKEND": "channels_redis.core.RedisChannelLayer",
         "CONFIG": {
-            "hosts": [("127.0.0.1", 6379)],
+            "hosts": [(os.environ.get("REDIS_URL", "127.0.0.1"), 6379)],
         },
     },
 }