---
title: Using an Origin Header Factor as a Flag for 3rd-Party Testing
description: To allow third-party sites to use a flag sent by SiteSpect to enable different behavior, use an Origin Header Factor. To retrieve the flag and parse its value, you must write some JavaScript that runs
---

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# Using an Origin Header Factor as a Flag for 3rd-Party Testing

#### Setting-up the Flag in SiteSpect

To allow third-party sites to use a flag sent by SiteSpect to enable different behavior, use an Origin Header Factor.

1. Create a new **Origin Factor**.
2. Select **Header** as the Type.
3. Provide a **Header Name**; this is the name of the flag your 3rd-party sites can use.
4. Provide a **Header Value**. Each Variation you create can have a different value. This is how you can identify which users belong to which cohort.

#### Using the Flag on a 3rd-Party Site

To retrieve the flag and parse its value, you must write some JavaScript that runs on the 3rd-party Sites. The script must:

1. Make an XMLHttpRequest (XHR) to your domain (served through SiteSpect).
2. The XHR request must leverage the X-Set-SiteSpect-Cookie/X-SiteSpect-Cookie headers (as described in a separate document).
3. When receiving the response, call the following method of the XHR object: xhr.getResponseHeader('\<Name-of-your-Origin-Factor\>').
4. The value of this method call is the value you set for the Variation served to the client.

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