# Using URL filtering for deep links in Amazon WorkSpaces Secure Browser
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Any user you share this portal link with can manipulate the deep link value to visit a website, if that domain is reachable from the portal and not on the URL blocklist. To create a restrictive allowlist or blocklist to prevent users from visiting unintended domains with your portal, use URL filtering.

The allowlist and blocklist for a portal can be edited with URL filtering in your portal’s browser settings. To do this, append the URL to an allow-listed portal URL in the following format, where UUID is the portal id: https://<uuid>.workspaces-web.com/?deepLinks=https%3A%2F%2Fwww.example.com%2F%3Fquery%3Dtrue

For more information, see [Web content filtering in Amazon WorkSpaces Secure Browser](web-content-filtering.md) and [Allow or block access to websites](https://support.google.com/chrome/a/answer/7532419?hl=en).