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142 lines
4.5 KiB
Markdown
142 lines
4.5 KiB
Markdown
---
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title: "Traefik Errors Documentation"
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description: "In Traefik Proxy, the Errors middleware returns custom pages according to configured ranges of HTTP Status codes. Read the technical documentation."
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---
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# Errors
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It Has Never Been Easier to Say That Something Went Wrong
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{: .subtitle }
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The Errors middleware returns a custom page in lieu of the default, according to configured ranges of HTTP Status codes.
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!!! important
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The error page itself is _not_ hosted by Traefik.
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## Configuration Examples
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```yaml tab="Docker & Swarm"
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# Dynamic Custom Error Page for 5XX Status Code
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labels:
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- "traefik.http.middlewares.test-errors.errors.status=500,501,503,505-599"
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- "traefik.http.middlewares.test-errors.errors.service=serviceError"
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- "traefik.http.middlewares.test-errors.errors.query=/{status}.html"
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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-errors
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spec:
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errors:
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status:
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- "500"
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- "501"
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- "503"
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- "505-599"
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query: /{status}.html
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service:
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name: whoami
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port: 80
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```
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```yaml tab="Consul Catalog"
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# Dynamic Custom Error Page for 5XX Status Code excluding 502 and 504
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- "traefik.http.middlewares.test-errors.errors.status=500,501,503,505-599"
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- "traefik.http.middlewares.test-errors.errors.service=serviceError"
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- "traefik.http.middlewares.test-errors.errors.query=/{status}.html"
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```
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```yaml tab="File (YAML)"
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# Dynamic Custom Error Page for 5XX Status Code excluding 502 and 504
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http:
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middlewares:
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test-errors:
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errors:
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status:
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- "500"
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- "501"
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- "503"
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- "505-599"
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service: serviceError
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query: "/{status}.html"
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services:
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# ... definition of error-handler-service and my-service
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```
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```toml tab="File (TOML)"
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# Dynamic Custom Error Page for 5XX Status Code excluding 502 and 504
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[http.middlewares]
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[http.middlewares.test-errors.errors]
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status = ["500","501","503","505-599"]
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service = "serviceError"
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query = "/{status}.html"
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[http.services]
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# ... definition of error-handler-service and my-service
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```
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!!! note ""
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In this example, the error page URL is based on the status code (`query=/{status}.html`).
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## Configuration Options
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### `status`
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The `status` option defines which status or range of statuses should result in an error page.
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The status code ranges are inclusive (`505-599` will trigger with every code between `505` and `599`, `505` and `599` included).
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!!! note ""
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You can define either a status code as a number (`500`),
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as multiple comma-separated numbers (`500,502`),
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as ranges by separating two codes with a dash (`505-599`),
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or a combination of the two (`404,418,505-599`).
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The comma-separated syntax is only available for label-based providers.
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The examples above demonstrate which syntax is appropriate for each provider.
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### `statusRewrites`
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An optional mapping of status codes to be rewritten. For example, if a service returns a 418, you might want to rewrite it to a 404.
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You can map individual status codes or even ranges to a different status code. The syntax for ranges follows the same rules as the `status` option.
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Here is an example:
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```yml
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statusRewrites:
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"500-503": 500
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"418": 404
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```
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### `service`
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The service that will serve the new requested error page.
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!!! note ""
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In Kubernetes, you need to reference a Kubernetes Service instead of a Traefik service.
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!!! info "Host Header"
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By default, the client `Host` header value is forwarded to the configured error [service](#service).
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To forward the `Host` value corresponding to the configured error service URL, the [passHostHeader](../../../routing/services/#pass-host-header) option must be set to `false`.
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### `query`
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The URL for the error page (hosted by [`service`](#service))).
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There are multiple variables that can be placed in the `query` option to insert values in the URL.
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The table below lists all the available variables and their associated values.
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| Variable | Value |
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|--------------------|--------------------------------------------------------------------------------------------|
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| `{status}` | The response status code. It may be rewritten when using the `statusRewrites` option. |
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| `{originalStatus}` | The original response status code, if it has been modified by the `statusRewrites` option. |
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| `{url}` | The [escaped](https://pkg.go.dev/net/url#QueryEscape) request URL. |
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