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---
title: Proxy Provider
---
:::info
This provider is to be used in conjunction with [Outposts ](../outposts/outposts.md )
:::
This provider protects applications, which have no built-in support for OAuth2 or SAML. This is done by running a lightweight Reverse Proxy in front of the application, which authenticates the requests.
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authentik Proxy is based on [oauth2_proxy ](https://github.com/oauth2-proxy/oauth2-proxy ), but has been integrated more tightly with authentik.
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The Proxy these extra headers to the application:
| Header Name | Value |
| ------------------------------ | --------------------------------------------------- |
| X-Forwarded-User | The user's unique identifier (**not the username**) |
| X-Forwarded-Email | The user's email address |
| X-Forwarded-Preferred-Username | The user's username |
| X-Auth-Username | The user's username |
Additionally, you can add more custom headers using `additionalHeaders` in the User or Group Properties, for example
```yaml
additionalHeaders:
X-additional-header: bar
```
