authelia/docs/features/single-factor.md
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[DOCS] Fix Docs Links (#674)
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---
layout: default
title: Single Factor
parent: Features
nav_order: 3
---
# Single Factor
**Authelia** supports single factor authentication to let applications
send authenticated requests to other applications.
Single or two-factor authentication can be configured per resource of an
application for flexibility.
For instance, you can configure Authelia to grant access to all resources
matching `app1.example.com/api/(.*)` with only a single factor and all
resources matching `app1.example.com/admin` with two factors.
To know more about the configuration of the feature, please visit the
documentation about the [configuration](../configuration/access-control.md).
## Proxy-Authorization header
Authelia reads credentials from the header `Proxy-Authorization` instead of
the usual `Authorization` header. This is because in some circumstances both Authelia
and the application could require authentication in order to provide specific
authorizations at the level of the application.