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74 lines
2.3 KiB
Markdown
74 lines
2.3 KiB
Markdown
---
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title: "Traefik StripPrefixRegex Documentation"
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description: "In Traefik Proxy's HTTP middleware, StripPrefixRegex removes prefixes from paths before forwarding requests, using regex. Read the technical documentation."
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---
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# StripPrefixRegex
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Removing Prefixes From the Path Before Forwarding the Request (Using a Regex)
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{: .subtitle }
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Remove the matching prefixes from the URL path.
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## Configuration Examples
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```yaml tab="Docker & Swarm"
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labels:
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- "traefik.http.middlewares.test-stripprefixregex.stripprefixregex.regex=/foo/[a-z0-9]+/[0-9]+/"
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```
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```yaml tab="Kubernetes"
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apiVersion: traefik.io/v1alpha1
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kind: Middleware
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metadata:
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name: test-stripprefixregex
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spec:
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stripPrefixRegex:
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regex:
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- "/foo/[a-z0-9]+/[0-9]+/"
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```
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```yaml tab="Consul Catalog"
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- "traefik.http.middlewares.test-stripprefixregex.stripprefixregex.regex=/foo/[a-z0-9]+/[0-9]+/"
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```
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```yaml tab="File (YAML)"
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http:
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middlewares:
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test-stripprefixregex:
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stripPrefixRegex:
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regex:
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- "/foo/[a-z0-9]+/[0-9]+/"
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```
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```toml tab="File (TOML)"
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[http.middlewares]
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[http.middlewares.test-stripprefixregex.stripPrefixRegex]
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regex = ["/foo/[a-z0-9]+/[0-9]+/"]
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```
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## Configuration Options
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### General
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The StripPrefixRegex middleware strips the matching path prefix and stores it in a `X-Forwarded-Prefix` header.
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!!! tip
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Use a `stripPrefixRegex` middleware if your backend listens on the root path (`/`) but should be exposed on a specific prefix.
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### `regex`
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The `regex` option is the regular expression to match the path prefix from the request URL.
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For instance, `/products` also matches `/products/shoes` and `/products/shirts`.
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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.
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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).
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!!! tip
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Regular expressions and replacements 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).
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When defining a regular expression within YAML, any escaped character needs to be escaped twice: `example\.com` needs to be written as `example\\.com`.
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