# 404 Handling

What should happen when users visit an alias domain on your site, but the URL doesn't match any of the content attached to the alias domain? 

We've added a 404 Handling mechanism that can be enabled by activating the *404 Handling* checkbox:

<figure><img src="/files/7u1Pea6IYDKiJati2WTo" alt=""><figcaption><p>404 Handling Checkbox</p></figcaption></figure>

There are two possibilities when enabling the 404 handling mechanism:

* **Throw 404 Error** - You can throw a standard 404 error, as if the page is simply missing. This keeps the experience similar to a standalone website.
* **Redirect to microsite homepage** - This means that the site visitor will be redirected to the alias domain homepage, configured in the domain mapping settings. See [*Creating Microsites*](https://docs.domainmappingsystem.com/features/creating-microsites-multisite-alternative) for more information about how to set the microsite homepage. This functionality replaces the need for a "404 Redirect to Homepage" type of plugin.&#x20;


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# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.