WebSocket domain filter throws TypeError on relative URLs (e.g. webpack HMR)

[classiemilio]

Description

When using allowedDomains with a dev server that uses webpack, the domain filter's _checkUrl() function throws TypeError: Failed to construct 'URL': Invalid URL on relative URLs like /__webpack_hmr (webpack's hot module reloading endpoint).

Root Cause

In src/domain-filter.ts (and the corresponding inline script in cli/src/native/network.rs), the WebSocket URL is parsed with:

var parsed = new URL(url);

new URL(url) requires an absolute URL. Relative paths (e.g. /__webpack_hmr) need a base URL to resolve against, otherwise the constructor throws a TypeError.

Steps to Reproduce

1. Configure allowedDomains in agent-browser
2. Run a webpack dev server (or any setup that opens WebSocket connections with relative URLs like /__webpack_hmr)
3. Observe TypeError: Failed to construct 'URL': Invalid URL in the console

Expected Behavior

Relative URLs should be resolved against the current page origin (location.href) without throwing an error.

Affected Files

• src/domain-filter.ts — _checkUrl() function
• cli/src/native/network.rs — inline WebSocket filter script

[classiemilio]

Fix PR: #624