From a9ba9bbd455c402fa19f30a311ba88adb930c5c6 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Tue, 15 Oct 2024 06:23:14 -0500
Subject: [PATCH] Avoid splitting the netloc for simple cases when constructing
 URL (#1277)

---
 yarl/_url.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/yarl/_url.py b/yarl/_url.py
index 7125b936..470d18aa 100644
--- a/yarl/_url.py
+++ b/yarl/_url.py
@@ -273,7 +273,12 @@ def __new__(
             if not netloc:  # netloc
                 host = ""
             else:
-                username, password, host, port = cls._split_netloc(netloc)
+                if ":" in netloc or "@" in netloc or "[" in netloc:
+                    # Complex netloc
+                    username, password, host, port = cls._split_netloc(netloc)
+                else:
+                    username = password = port = None
+                    host = netloc
                 if host is None:
                     if scheme in SCHEME_REQUIRES_HOST:
                         msg = (