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+# Setup with host delegation
+
+## Abstract
+
+By default, Matrix assumes that `@alice:example.com`'s server is located at `example.com`.
+The same is true Matrix Content URIs (MXC), aka. the media files.
+
+The process of *delegating* the Synapse server to a subdomain while keeping the original server name can
+be found [here](https://github.com/matrix-org/synapse/blob/master/docs/delegate.md).
+
+This example setup uses `example.org` as server name while running Synapse and the matrix-media-repo on `matrix.example.com`.
+Both services are running behind a reverse proxy.
+
+## Configuring the media-repo
+
+media-repo.yaml:
+```yaml
+repo:
+  useForwaredHost: true  # See notes below
+  ...
+
+homeservers:
+  - name: example.com
+    csApi: https://matrix.example.com # The base URL to where the homeserver can actually be reached
+    ...
+```
+
+A full sample config can be found [here](https://github.com/turt2live/matrix-media-repo/blob/master/config.sample.yaml).
+
+The homeserver name has to match the server_name configured while also match the HTTP Host Header. If they aren't the
+same, the media request gets rejected.
+
+In scenarios the Host Header cannot be manipulated easily like with [Traefik](https://docs.traefik.io/) as
+Kubernetes Ingress Controller, set `repo.useForwardedHost = true`. With this option the media-repo prefers the
+`X-Forwarded-Host` over the `Host` Header as Host. Keep in mind that this might be unsuitable for your environment 
+like in [#202](https://github.com/turt2live/matrix-media-repo/issues/202).
+
+## Configuring the reverse proxy
+
+The reverse proxy has to set the `Host` or `X-Forwarded-Host` to `example.com` as explained above.
+
+### Traefik as Kubernetes Ingress Controller
+
+Traefik 2.0+ is able to populate custom but **not** the original `Host` headers using a [Middleware](https://docs.traefik.io/middlewares/headers/#general).
+
+Middleware Kubernetes Resource:
+```yaml
+apiVersion: traefik.containo.us/v1alpha1
+kind: Middleware
+metadata:
+  name: matrix-host
+spec:
+  headers:
+    customRequestHeaders:
+      X-Forwarded-Host: "example.com"
+```
+
+IngressRoute Kubernetes Resource
+```yaml
+apiVersion: traefik.containo.us/v1alpha1
+kind: IngressRoute
+metadata:
+  name: matrix
+spec:
+  entryPoints:
+    - websecure
+  routes:
+  - match: Host(`matrix.example.com`) && PathPrefix(`/_matrix/`)
+    kind: Rule
+    services:
+      - name: matrix
+        port: 8008
+  - match: Host(`matrix.example.com`) && PathPrefix(`/_matrix/media/`)
+    kind: Rule
+    services:
+      - name: media-repo
+        port: 8000
+    middlewares:
+      - name: matrix-host
+```