diff --git a/synapse/http/site.py b/synapse/http/site.py
index 7421c172e4..4a4fb5ef26 100644
--- a/synapse/http/site.py
+++ b/synapse/http/site.py
@@ -333,27 +333,13 @@ class SynapseRequest(Request):
 
 
 class XForwardedForRequest(SynapseRequest):
-    """
-    Add a layer on top of another request that only uses the value of an
-    X-Forwarded-For header as the result of C{getClientIP}.
-
-    XXX: I think the right way to do this is with request.setHost().
-    """
-
     def __init__(self, *args, **kw):
         SynapseRequest.__init__(self, *args, **kw)
 
-        forwarded_header = self.getHeader(b"x-forwarded-proto")
-        if forwarded_header is not None:
-            self._is_secure = forwarded_header.lower() == b"https"
-        else:
-            logger.warning(
-                "received request lacks an x-forwarded-proto header: assuming https"
-            )
-            self._is_secure = True
-
-    def isSecure(self):
-        return self._is_secure
+    """
+    Add a layer on top of another request that only uses the value of an
+    X-Forwarded-For header as the result of C{getClientIP}.
+    """
 
     def getClientIP(self):
         """