Add SECURE_PROXY_SSL_HEADER to settings.py.

sms_feed/settings.py

     messages.ERROR: 'danger'
 }
 
+# This should only be set if we are running behind a proxy server that always
+# sets this header and never allows it to be passed directly on from clients.
+SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
+
 from settings_local import *