Add middleware for fix "get_host() method fails when the host is behind multiple proxies"

utils/middleware.py

@@ -0,0 +1,17 @@
+class MultipleProxyMiddleware(object):
+    FORWARDED_FOR_FIELDS = [
+        'HTTP_X_FORWARDED_FOR',
+        'HTTP_X_FORWARDED_HOST',
+        'HTTP_X_FORWARDED_SERVER',
+    ]
+
+    def process_request(self, request):
+        """
+        Rewrites the proxy headers so that only the most
+        recent proxy is used.
+        """
+        for field in self.FORWARDED_FOR_FIELDS:
+            if field in request.META:
+                if ',' in request.META[field]:
+                    parts = request.META[field].split(',')
+                    request.META[field] = parts[-1].strip()