traefik/docs/content/middlewares/stripprefix.md
2021-02-11 14:34:04 +01:00

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# StripPrefix
Removing Prefixes From the Path Before Forwarding the Request
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TODO: add schema
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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
```
```yaml tab="Consul Catalog"
# Strip prefix /foobar and /fiibar
- "traefik.http.middlewares.test-stripprefix.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 strips the matching path prefix and stores it in a `X-Forwarded-Prefix` header.
!!! tip
Use a `StripPrefix` middleware if your backend listens on the root path (`/`) but should be exposed on a specific prefix.
### `prefixes`
The `prefixes` option defines the prefixes to strip from the request URL.
For instance, `/products` also matches `/products/shoes` and `/products/shirts`.
If your backend is serving assets (e.g., images or JavaScript files), it can use the `X-Forwarded-Prefix` header to properly construct relative URLs.
Using the previous 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).
### `forceSlash`
_Optional, Default=true_
The `forceSlash` option ensures the resulting stripped path is not the empty string, by replacing it with `/` when necessary.
This option was added to keep the initial (non-intuitive) behavior of this middleware, in order to avoid introducing a breaking change.
It is recommended to explicitly set `forceSlash` to `false`.
??? info "Behavior examples"
- `forceSlash=true`
| Path | Prefix to strip | Result |
|------------|-----------------|--------|
| `/` | `/` | `/` |
| `/foo` | `/foo` | `/` |
| `/foo/` | `/foo` | `/` |
| `/foo/` | `/foo/` | `/` |
| `/bar` | `/foo` | `/bar` |
| `/foo/bar` | `/foo` | `/bar` |
- `forceSlash=false`
| Path | Prefix to strip | Result |
|------------|-----------------|--------|
| `/` | `/` | empty |
| `/foo` | `/foo` | empty |
| `/foo/` | `/foo` | `/` |
| `/foo/` | `/foo/` | empty |
| `/bar` | `/foo` | `/bar` |
| `/foo/bar` | `/foo` | `/bar` |
```yaml tab="Docker"
labels:
- "traefik.http.middlewares.example.stripprefix.prefixes=/foobar"
- "traefik.http.middlewares.example.stripprefix.forceSlash=false"
```
```yaml tab="Kubernetes"
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: example
spec:
stripPrefix:
prefixes:
- "/foobar"
forceSlash: false
```
```json tab="Marathon"
"labels": {
"traefik.http.middlewares.example.stripprefix.prefixes": "/foobar",
"traefik.http.middlewares.example.stripprefix.forceSlash": "false"
}
```
```yaml tab="Rancher"
labels:
- "traefik.http.middlewares.example.stripprefix.prefixes=/foobar"
- "traefik.http.middlewares.example.stripprefix.forceSlash=false"
```
```toml tab="File (TOML)"
[http.middlewares]
[http.middlewares.example.stripPrefix]
prefixes = ["/foobar"]
forceSlash = false
```
```yaml tab="File (YAML)"
http:
middlewares:
example:
stripPrefix:
prefixes:
- "/foobar"
forceSlash: false
```