traefik/docs/content/middlewares/stripprefix.md

# StripPrefix

Removing Prefixes From the Path Before Forwarding the Request
{: .subtitle }

`TODO: add schema`

Remove the specified prefixes from the URL path.

## Configuration Examples

```yaml tab="Docker"
# Strip prefix /foobar and /fiibar
labels:
- "traefik.http.middlewares.test-stripprefix.stripprefix.prefixes=/foobar,/fiibar"
```

```yaml tab="Kubernetes"
# Strip prefix /foobar and /fiibar
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-stripprefix
spec:
  stripPrefix:
    prefixes:
    - /foobar
    - /fiibar
```

```json tab="Marathon"
"labels": {
  "traefik.http.middlewares.test-stripprefix.stripprefix.prefixes": "/foobar,/fiibar"
}
```

```yaml tab="Rancher"
# Strip prefix /foobar and /fiibar
labels:
- "traefik.http.middlewares.test-stripprefix.stripprefix.prefixes=/foobar,/fiibar"
```

```toml tab="File (TOML)"
# Strip prefix /foobar and /fiibar
[http.middlewares]
  [http.middlewares.test-stripprefix.stripPrefix]
    prefixes = ["/foobar", "/fiibar"]
```

```yaml tab="File (YAML)"
# Strip prefix /foobar and /fiibar
http:
  middlewares:
    test-stripprefix:
      stripPrefix:
        prefixes:
        - "/foobar"
        - "/fiibar"
```

## Configuration Options

### General

The StripPrefix middleware will:

- strip the matching path prefix.
- store the matching path prefix in a `X-Forwarded-Prefix` header.

!!! tip
    
    Use a `StripPrefix` middleware if your backend listens on the root path (`/`) but should be routeable on a specific prefix.

### `prefixes`

The `prefixes` option defines the prefixes to strip from the request URL.

For instance, `/products` would match `/products` but also `/products/shoes` and `/products/shirts`.

Since the path is stripped prior to forwarding, your backend is expected to listen on `/`.

If your backend is serving assets (e.g., images or Javascript files), chances are it must return properly constructed relative URLs.  
Continuing on the example, the backend should return `/products/shoes/image.png` (and not `/images.png` which Traefik would likely not be able to associate with the same backend).  

The `X-Forwarded-Prefix` header can be queried to build such URLs dynamically.