* refactor receiverid into a separate controller base

* allow multiple headers to prepare for checking multiple claims

owrx/controllers/__init__.py

@@ -18,7 +18,11 @@ class Controller(object):
         if max_age is not None:
             headers["Cache-Control"] = "max-age: {0}".format(max_age)
         for key, value in headers.items():
-            self.handler.send_header(key, value)
+            if isinstance(value, list):
+                for v in value:
+                    self.handler.send_header(key, v)
+            else:
+                self.handler.send_header(key, value)
         self.handler.end_headers()
         if type(content) == str:
             content = content.encode()