From b631279152c81d67b6d68aa69a079040e2c94a14 Mon Sep 17 00:00:00 2001
From: SukkaW <isukkaw@gmail.com>
Date: Wed, 10 Dec 2025 13:51:55 +0800
Subject: [PATCH] Enhance Reject Hosts Subsomain Stripping

---
 Build/lib/normalize-domain.ts     | 1 +
 Build/lib/parse-filter/filters.ts | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Build/lib/normalize-domain.ts b/Build/lib/normalize-domain.ts
index 4b6ef24a..0866f684 100644
--- a/Build/lib/normalize-domain.ts
+++ b/Build/lib/normalize-domain.ts
@@ -24,6 +24,7 @@ function fastNormalizeDomainWithoutWwwNoIP(domain: string, parsed: TldTsParsed |
       || parsed.subdomain === 'xml-v4'
       || parsed.subdomain === 'xml-eu'
       || parsed.subdomain === 'xml-eu-v4'
+      || (parsed.subdomain.length === 4 && parsed.subdomain.startsWith('www'))
     ) {
       return parsed.domain;
     }
diff --git a/Build/lib/parse-filter/filters.ts b/Build/lib/parse-filter/filters.ts
index b54672fa..a0be6d38 100644
--- a/Build/lib/parse-filter/filters.ts
+++ b/Build/lib/parse-filter/filters.ts
@@ -608,6 +608,7 @@ function onHostname(
         || parsed.subdomain === 'xml-v4'
         || parsed.subdomain === 'xml-eu'
         || parsed.subdomain === 'xml-eu-v4'
+        || (parsed.subdomain.length === 4 && parsed.subdomain.startsWith('www'))
       ) {
         hostname = parsed.domain;
       } else if (parsed.subdomain.startsWith('www.')) {