From 8c1e010e193cc3056805c58cf928ee2e3c6ea44c Mon Sep 17 00:00:00 2001
From: Harsh Parekh <harsh_parekh@outlook.com>
Date: Wed, 12 Mar 2025 04:30:57 -0400
Subject: [PATCH] Add log_message property to HTTPError for backwards
 compatibility

---
 tornado/web.py | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/tornado/web.py b/tornado/web.py
index adcdfc14..54da2e19 100644
--- a/tornado/web.py
+++ b/tornado/web.py
@@ -2518,14 +2518,23 @@ class HTTPError(Exception):
         **kwargs: Any,
     ) -> None:
         self.status_code = status_code
-        self.log_message = log_message
+        self._log_message = log_message
         self.args = args
         self.reason = kwargs.get("reason", None)
 
+    @property
+    def log_message(self) -> Optional[str]:
+        """
+        A backwards compatible way of accessing log_message.
+        """
+        if self._log_message and not self.args:
+            return self._log_message.replace("%", "%%")
+        return self._log_message
+
     def get_message(self) -> Optional[str]:
-        if self.log_message and self.args:
-            return self.log_message % self.args
-        return self.log_message
+        if self._log_message and self.args:
+            return self._log_message % self.args
+        return self._log_message
 
     def __str__(self) -> str:
         message = "HTTP %d: %s" % (
-- 
2.47.2