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-rw-r--r--pyramid/session.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pyramid/session.py b/pyramid/session.py
index 8e5ee8dd6..a88d8a71c 100644
--- a/pyramid/session.py
+++ b/pyramid/session.py
@@ -192,7 +192,7 @@ def check_csrf_origin(request, trusted_origins=None, raises=True):
if not any(is_same_domain(originp.netloc, host)
for host in trusted_origins):
reason = (
- "Referer checking failed - {} does not match any trusted "
+ "Referer checking failed - {0} does not match any trusted "
"origins."
)
return _fail(reason.format(origin))