traefik/docs/content/middlewares/stripprefixregex.md

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# StripPrefixRegex
Removing Prefixes From the Path Before Forwarding the Request (Using a Regex)
{: .subtitle }
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`TODO: add schema`
Remove the matching prefixes from the URL path.
## Configuration Examples
```yaml tab="Docker"
# Replace the path by /foo
labels:
- "traefik.http.middlewares.test-stripprefixregex.stripprefixregex.regex=^/foo/(.*)",
```
```yaml tab="Kubernetes"
# Replace the path by /foo
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: test-stripprefixregex
spec:
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stripPrefixRegex:
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regex: "^/foo/(.*)"
```
```json tab="Marathon"
"labels": {
"traefik.http.middlewares.test-stripprefixregex.stripprefixregex.regex": "^/foo/(.*)"
}
```
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```yaml tab="Rancher"
# Replace the path by /foo
labels:
- "traefik.http.middlewares.test-stripprefixregex.stripprefixregex.regex=^/foo/(.*)",
```
```toml tab="File"
# Replace the path by /foo
[http.middlewares]
[http.middlewares.test-stripprefixregex.StripPrefixRegex]
regex: "^/foo/(.*)"
```
## Configuration Options
### General
The StripPrefixRegex middleware will:
- strip the matching path prefix.
- store the matching path prefix in a `X-Forwarded-Prefix` header.
!!! tip
Use a `StripPrefixRegex` middleware if your backend listens on the root path (`/`) but should be routeable on a specific prefix.
### `regex`
The `regex` option is the regular expression to match the path prefix from the request URL.
!!! tip
Regular expressions can be tested using online tools such as [Go Playground](https://play.golang.org/p/mWU9p-wk2ru) or the [Regex101](https://regex101.com/r/58sIgx/2).
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 `/`.
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If your backend is serving assets (e.g., images or Javascript files), chances are it must return properly constructed relative URLs.
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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).
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The `X-Forwarded-Prefix` header can be queried to build such URLs dynamically.