From 543b60092d4feedabbdcfb0a0d545a013944f43e Mon Sep 17 00:00:00 2001
From: tzy-17 <tang.ziyi@xydigit.com>
Date: Fri, 17 Jul 2026 04:40:18 +0800
Subject: [PATCH] fix(cli): use startsWith for loopback IPv4 check in container
 proxy (#106077)

isLoopbackProxyHostname used split(".", 1)[0] === "127" to detect
127.0.0.0/8 addresses. While isIP() already rejects leading-zero octets
before this branch is reached, startsWith("127.") is more direct and
clearly expresses the intent of matching the entire 127.0.0.0/8 range.
---
 src/cli/container-target.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cli/container-target.ts b/src/cli/container-target.ts
index 0f410af8dd5e..e2706c3c40d8 100644
--- a/src/cli/container-target.ts
+++ b/src/cli/container-target.ts
@@ -184,7 +184,7 @@ function isLoopbackProxyHostname(hostname: string): boolean {
     return true;
   }
   if (isIP(normalizedHostname) === 4) {
-    return normalizedHostname.split(".", 1)[0] === "127";
+    return normalizedHostname.startsWith("127.");
   }
   const ipv6Hostname = normalizedHostname.replace(/^\[|\]$/g, "");
   if (isIP(ipv6Hostname) !== 6) {