authelia/docs/deployment/supported-proxies/caddy.md

---
layout: default
title: Caddy
parent: Proxy Integration
grand_parent: Deployment
nav_order: 1
---

# Caddy

[Caddy] is a reverse proxy supported by **Authelia**. 

_**Important:** Caddy officially supports the forward auth flow in version 2.5.1 and greater. You must be using this 
version in order to use either Caddyfile._

Authelia offers integration support for the official forward auth integration method Caddy provides, we
can't reasonably be expected to offer support for all of the different plugins that exist.

## Configuration

Below you will find commented examples of the following configuration:

* Authelia portal
* Protected endpoint (Nextcloud)

### Basic examples

This example is the preferred example for integration with Caddy. There is an [advanced example](#advanced-example) but
we _**strongly urge**_ anyone who needs to use this for a particular reason to either reach out to us or Caddy for support
to ensure the basic example covers your use case in a secure way.


#### Subdomain

```Caddyfile
authelia.example.com {
	reverse_proxy authelia:9091
}

nextcloud.example.com {
	forward_auth authelia:9091 {
		uri /api/verify?rd=https://authelia.example.com
		copy_headers Remote-User Remote-Groups Remote-Name Remote-Email
	}
	reverse_proxy nextcloud:80
}
```

#### Subpath

```Caddyfile
example.com {
	@authelia path /authelia /authelia/*
	handle @authelia {
		reverse_proxy authelia:9091
	}
	
	@nextcloud path /nextcloud /nextcloud/*
	handle @nextcloud {
		forward_auth authelia:9091 {
			uri /api/verify?rd=https://example.com/authelia
			copy_headers Remote-User Remote-Groups Remote-Name Remote-Email
		}
		reverse_proxy nextcloud:80
	}
}
```

## Advanced example

The advanced example allows for more flexible customization, however the [basic example](#basic-example) should be
preferred in _most_ situations. If you are unsure of what you're doing please don't use this method.

_**Important:** Making a mistake when configuring the advanced example could lead to authentication bypass or errors._

```Caddyfile
authelia.example.com {
	reverse_proxy authelia:9091
}

nextcloud.example.com {
	route {
		reverse_proxy authelia:9091 {
			method GET
			rewrite "/api/verify?rd=https://authelia.example.com"

			header_up X-Forwarded-Method {method}
			header_up X-Forwarded-Uri {uri}

			## If the auth request:
			##   1. Responds with a status code IN the 200-299 range.
			## Then:
			##   1. Proxy the request to the backend.
			##   2. Copy the relevant headers from the auth request and provide them to the backend.
			@good status 2xx
			handle_response @good {
				request_header {
					Remote-User {http.reverse_proxy.header.Remote-User}
					Remote-Groups {http.reverse_proxy.header.Remote-Groups}
					Remote-Name {http.reverse_proxy.header.Remote-Name}
					Remote-Email {http.reverse_proxy.header.Remote-Email}
				}
			}

			## If the auth request:
			##   1. Responds with a status code NOT IN the 200-299 range.
			## Then:
			##   1. Respond with the status code of the auth request.
			##   1. Copy the response except for several headers.
			@denied {
				status 1xx 3xx 4xx 5xx
			}
			handle_response @denied {
				copy_response
				copy_response_headers {
					exclude Connection Keep-Alive Te Trailers Transfer-Encoding Upgrade
				}
			}
		}

		reverse_proxy nextcloud:80
	}
}
```


[Caddy]: https://caddyserver.com