diff --git a/cps/kobo.py b/cps/kobo.py
index 97d55db0..69708d0c 100644
--- a/cps/kobo.py
+++ b/cps/kobo.py
@@ -19,8 +19,6 @@
 
 import base64
 import datetime
-import itertools
-import json
 import sys
 import os
 import uuid
@@ -267,7 +265,7 @@ def HandleMetadataRequest(book_uuid):
 
 def get_download_url_for_book(book, book_format):
     if not current_app.wsgi_app.is_proxied:
-        if ':' in request.host and not request.host.endswith(']') :
+        if ':' in request.host and not request.host.endswith(']'):
             host = "".join(request.host.split(':')[:-1])
         else:
             host = request.host
diff --git a/cps/reverseproxy.py b/cps/reverseproxy.py
index 42b64050..3bcbd3b7 100644
--- a/cps/reverseproxy.py
+++ b/cps/reverseproxy.py
@@ -77,6 +77,7 @@ class ReverseProxied(object):
         servr = environ.get('HTTP_X_FORWARDED_HOST', '')
         if servr:
             environ['HTTP_HOST'] = servr
+            self.proxied = True
         return self.app(environ, start_response)
 
     @property