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What are the extra hosts in scope for?
What are the extra hosts in scope for?

Extra hosts that you can add to the scanning scope

Nuno Loureiro avatar
Written by Nuno Loureiro
Updated over a week ago

When you add a target, Probely will only scan pages under that target, i.e., it will not scan any pages from a different hostname.

If your target is a Single-Page App (SPA), this could be a problem. In a SPA, the web app is pretty much built in Javascript, and the server-side application is invoked via an API. Sometimes, this API sits under, but it's very frequent to see the API on a dedicated host, such as

This is what the setting "Add Site to Target" is for. If you have an API residing on a different hostname, you can add it there. This way, our scanner will scan the API as well.

Technically speaking, what this option does, is:

  • Any XMLHttpRequest performed to a host added under this setting, is followed and scanned.

In order to add an extra host, just access your target's Settings page and locate the "Extra Hosts" tab:

Once you've done so, simply paste your API's host and click ADD.

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