traefik/docs/content/middlewares/stripprefix.md
2019-06-18 09:50:05 +02:00

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# 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"
# Strip prefix /foobar and /fiibar
[http.middlewares]
[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.