From ae8f34c80d9c07f760599a8cc0a45faf0b258da6 Mon Sep 17 00:00:00 2001
From: perey <pederick@gmail.com>
Date: Sun, 15 Sep 2024 15:15:14 +0800
Subject: [PATCH] Don't match a leading, or no, underscore

---
 Lib/urllib/request.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index bc35d8a80e5d03..e49fc1ebb45782 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -417,6 +417,9 @@ def add_handler(self, handler):
                 continue
 
             i = meth.find("_")
+            if i < 1:
+                # Don't match "open", "_open", etc.
+                continue
             protocol = meth[:i]
             condition = meth[i+1:]