Browser: normalize localhost absolute-form CDP hosts (#59236)

* Browser: normalize localhost absolute-form CDP hosts

* CHANGELOG: note localhost absolute-form CDP fix

---------

Co-authored-by: Jacob Tomlinson <jtomlinson@nvidia.com>

CHANGELOG.md

@@ -53,6 +53,7 @@ Docs: https://docs.openclaw.ai
 - ACP/gateway reconnects: reject stale pre-ack ACP prompts after reconnect grace expiry so callers fail cleanly instead of hanging indefinitely when the gateway never confirms the run.
 - Providers/Copilot: classify native GitHub Copilot API hosts in the shared provider endpoint resolver and harden token-derived proxy endpoint parsing so Copilot base URL routing stays centralized and fails closed on malformed hints. Thanks @vincentkoc.
 - Gateway: prune empty `node-pending-work` state entries after explicit acknowledgments and natural expiry so the per-node state map no longer grows indefinitely. (#58179) Thanks @gavyngong.
+- Browser/CDP: normalize trailing-dot localhost absolute-form hosts before loopback checks so remote CDP websocket URLs like `ws://localhost.:...` rewrite back to the configured remote host. (#59236) Thanks @mappel-nv.
 
 ## 2026.4.1-beta.1
 

extensions/browser/src/browser/cdp.test.ts

@@ -320,6 +320,14 @@ describe("cdp", () => {
     expect(normalized).toBe("wss://user:pass@example.com/devtools/browser/ABC?token=abc");
   });
 
+  it("rewrites localhost absolute-form websocket URLs for remote CDP hosts", () => {
+    const normalized = normalizeCdpWsUrl(
+      "ws://localhost.:9222/devtools/browser/ABC",
+      "https://user:pass@example.com?token=abc",
+    );
+    expect(normalized).toBe("wss://user:pass@example.com/devtools/browser/ABC?token=abc");
+  });
+
   it("rewrites 0.0.0.0 wildcard bind address to remote CDP host", () => {
     const normalized = normalizeCdpWsUrl(
       "ws://0.0.0.0:3000/devtools/browser/ABC",

src/gateway/net.test.ts

@@ -3,6 +3,7 @@ import { afterEach, describe, expect, it, vi } from "vitest";
 import { makeNetworkInterfacesSnapshot } from "../test-helpers/network-interfaces.js";
 import {
   isLocalishHost,
+  isLoopbackHost,
   isPrivateOrLoopbackAddress,
   isPrivateOrLoopbackHost,
   isSecureWebSocketUrl,
@@ -28,6 +29,7 @@ describe("isLocalishHost", () => {
   it("accepts loopback and tailscale serve/funnel host headers", () => {
     const accepted = [
       "localhost",
+      "localhost.:18789",
       "127.0.0.1:18789",
       "[::1]:18789",
       "[::ffff:127.0.0.1]:18789",
@@ -46,6 +48,13 @@ describe("isLocalishHost", () => {
   });
 });
 
+describe("isLoopbackHost", () => {
+  it("accepts localhost absolute-form hostnames", () => {
+    expect(isLoopbackHost("localhost.")).toBe(true);
+    expect(isLoopbackHost("LOCALHOST...")).toBe(true);
+  });
+});
+
 describe("isTrustedProxyAddress", () => {
   it.each([
     {
@@ -394,6 +403,7 @@ describe("isPrivateOrLoopbackAddress", () => {
 describe("isPrivateOrLoopbackHost", () => {
   it("accepts localhost", () => {
     expect(isPrivateOrLoopbackHost("localhost")).toBe(true);
+    expect(isPrivateOrLoopbackHost("localhost.")).toBe(true);
   });
 
   it("accepts loopback addresses", () => {

src/gateway/net.ts

@@ -400,8 +400,9 @@ function parseHostForAddressChecks(
     return null;
   }
   const normalizedHost = host.trim().toLowerCase();
-  if (normalizedHost === "localhost") {
-    return { isLocalhost: true, unbracketedHost: normalizedHost };
+  const canonicalHost = normalizedHost.replace(/\.+$/, "");
+  if (canonicalHost === "localhost") {
+    return { isLocalhost: true, unbracketedHost: canonicalHost };
   }
   return {
     isLocalhost: false,