fix(control-ui): preserve loopback client version labels

CHANGELOG.md

@@ -20,6 +20,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Control UI/Gateway: preserve WebChat client version labels across localhost, 127.0.0.1, and IPv6 loopback aliases on the same port, avoiding misleading `vcontrol-ui` connection logs while investigating duplicate-message reports. Refs #72753 and #72742. Thanks @LumenFromTheFuture and @allesgutefy.
 - Memory-core: run one-shot memory CLI commands through transient builtin and QMD managers so `memory index`, `memory status --index`, and `memory search` no longer start long-lived file watchers that can hit macOS `EMFILE` limits. Fixes #59101; carries forward #49851. Thanks @mbear469210-coder and @maoyuanxue.
 - Memory-core: re-resolve the active runtime config whenever `memory_search` or `memory_get` executes, so provider changes made by `config.patch` stop leaving stale embedding backends behind in existing tool instances. Fixes #61098. Thanks @BradGroux and @Linux2010.
 - WebChat: keep bare `/new` and `/reset` startup instructions out of visible chat history while preserving `/reset <note>` as user-visible transcript text. Fixes #72369. Thanks @collynes and @haishmg.

ui/src/ui/app-gateway.node.test.ts

@@ -1025,6 +1025,33 @@ describe("resolveControlUiClientVersion", () => {
     ).toBe("2026.3.7");
   });
 
+  it("returns serverVersion for loopback aliases on the same port", () => {
+    expect(
+      resolveControlUiClientVersion({
+        gatewayUrl: "ws://127.0.0.1:18789",
+        serverVersion: "2026.4.24",
+        pageUrl: "http://localhost:18789/chat",
+      }),
+    ).toBe("2026.4.24");
+    expect(
+      resolveControlUiClientVersion({
+        gatewayUrl: "ws://[::1]:18789",
+        serverVersion: "2026.4.24",
+        pageUrl: "http://127.0.0.1:18789/chat",
+      }),
+    ).toBe("2026.4.24");
+  });
+
+  it("omits serverVersion for loopback aliases on different ports", () => {
+    expect(
+      resolveControlUiClientVersion({
+        gatewayUrl: "ws://127.0.0.1:18789",
+        serverVersion: "2026.4.24",
+        pageUrl: "http://localhost:19889/chat",
+      }),
+    ).toBeUndefined();
+  });
+
   it("omits serverVersion for cross-origin targets", () => {
     expect(
       resolveControlUiClientVersion({

ui/src/ui/app-gateway.ts

@@ -265,7 +265,7 @@ export function resolveControlUiClientVersion(params: {
     const page = new URL(pageUrl);
     const gateway = new URL(params.gatewayUrl, page);
     const allowedProtocols = new Set(["ws:", "wss:", "http:", "https:"]);
-    if (!allowedProtocols.has(gateway.protocol) || gateway.host !== page.host) {
+    if (!allowedProtocols.has(gateway.protocol) || !isSameControlUiVersionEndpoint(page, gateway)) {
       return undefined;
     }
     return serverVersion;
@@ -274,6 +274,44 @@ export function resolveControlUiClientVersion(params: {
   }
 }
 
+function isSameControlUiVersionEndpoint(page: URL, gateway: URL): boolean {
+  if (gateway.host === page.host) {
+    return true;
+  }
+  return (
+    isLoopbackHostname(page.hostname) &&
+    isLoopbackHostname(gateway.hostname) &&
+    resolveUrlEffectivePort(page) === resolveUrlEffectivePort(gateway)
+  );
+}
+
+function isLoopbackHostname(hostname: string): boolean {
+  const normalized = hostname.trim().toLowerCase().replace(/^\[/, "").replace(/\]$/, "");
+  return (
+    normalized === "localhost" ||
+    normalized === "::1" ||
+    normalized === "0:0:0:0:0:0:0:1" ||
+    normalized === "127.0.0.1" ||
+    normalized.startsWith("127.")
+  );
+}
+
+function resolveUrlEffectivePort(url: URL): string {
+  if (url.port) {
+    return url.port;
+  }
+  switch (url.protocol) {
+    case "http:":
+    case "ws:":
+      return "80";
+    case "https:":
+    case "wss:":
+      return "443";
+    default:
+      return "";
+  }
+}
+
 function normalizeSessionKeyForDefaults(
   value: string | undefined,
   defaults: SessionDefaultsSnapshot,