# HG changeset patch
# User Gregory Szorc <gregory.szorc@gmail.com>
# Date 2016-12-26 23:55:47
# Node ID 7dafa8d0e00670f33e811284575d0061b8fccd43
# Parent  758526333decf1a16fd0389bf739a786c738dc38

hgweb: don't use mutable default argument value

diff --git a/mercurial/hgweb/common.py b/mercurial/hgweb/common.py
--- a/mercurial/hgweb/common.py
+++ b/mercurial/hgweb/common.py
@@ -91,12 +91,12 @@ permhooks = [checkauthz]
 
 
 class ErrorResponse(Exception):
-    def __init__(self, code, message=None, headers=[]):
+    def __init__(self, code, message=None, headers=None):
         if message is None:
             message = _statusmessage(code)
         Exception.__init__(self, message)
         self.code = code
-        self.headers = headers
+        self.headers = headers or []
 
 class continuereader(object):
     def __init__(self, f, write):