From 7657ec7ed6318dd66dd72cc100ba7bc5b911366e Mon Sep 17 00:00:00 2001
From: Elyse <26639800+elyse0@users.noreply.github.com>
Date: Sat, 3 Sep 2022 22:09:45 -0500
Subject: [PATCH] [utils] `base_url`: URL paths can contain `&` (#4841)

Authored by: elyse0
Closes #4187
---
 test/test_utils.py | 1 +
 yt_dlp/utils.py    | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/test_utils.py b/test/test_utils.py
index 67cd966d8e..96477c53fc 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -566,6 +566,7 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(base_url('http://foo.de/bar/'), 'http://foo.de/bar/')
         self.assertEqual(base_url('http://foo.de/bar/baz'), 'http://foo.de/bar/')
         self.assertEqual(base_url('http://foo.de/bar/baz?x=z/x/c'), 'http://foo.de/bar/')
+        self.assertEqual(base_url('http://foo.de/bar/baz&x=z&w=y/x/c'), 'http://foo.de/bar/baz&x=z&w=y/x/')
 
     def test_urljoin(self):
         self.assertEqual(urljoin('http://foo.de/', '/a/b/c.txt'), 'http://foo.de/a/b/c.txt')
diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
index 90042aa8b9..53939f2902 100644
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -2479,7 +2479,7 @@ def url_basename(url):
 
 
 def base_url(url):
-    return re.match(r'https?://[^?#&]+/', url).group()
+    return re.match(r'https?://[^?#]+/', url).group()
 
 
 def urljoin(base, path):