Errors

It Has Never Been Easier to Say That Something Went Wrong

The Errors middleware returns a custom page in lieu of the default, according to configured ranges of HTTP Status codes.

Important

The error page itself is not hosted by Traefik.

Configuration Examples

Docker

# Dynamic Custom Error Page for 5XX Status Code
labels:
  - "traefik.http.middlewares.test-errors.errors.status=500-599"
  - "traefik.http.middlewares.test-errors.errors.service=serviceError"
  - "traefik.http.middlewares.test-errors.errors.query=/{status}.html"

Kubernetes

apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: test-errors
spec:
  errors:
    status:
      - "500-599"
    query: /{status}.html
    service:
      name: whoami
      port: 80

Consul Catalog

# Dynamic Custom Error Page for 5XX Status Code
- "traefik.http.middlewares.test-errors.errors.status=500-599"
- "traefik.http.middlewares.test-errors.errors.service=serviceError"
- "traefik.http.middlewares.test-errors.errors.query=/{status}.html"

Marathon

"labels": {
  "traefik.http.middlewares.test-errors.errors.status": "500-599",
  "traefik.http.middlewares.test-errors.errors.service": "serviceError",
  "traefik.http.middlewares.test-errors.errors.query": "/{status}.html"
}

Rancher

# Dynamic Custom Error Page for 5XX Status Code
labels:
  - "traefik.http.middlewares.test-errors.errors.status=500-599"
  - "traefik.http.middlewares.test-errors.errors.service=serviceError"
  - "traefik.http.middlewares.test-errors.errors.query=/{status}.html"

File (YAML)

# Custom Error Page for 5XX
http:
  middlewares:
    test-errors:
      errors:
        status:
          - "500-599"
        service: serviceError
        query: "/{status}.html"
  services:
    # ... definition of error-handler-service and my-service

File (TOML)

# Custom Error Page for 5XX
[http.middlewares]
  [http.middlewares.test-errors.errors]
    status = ["500-599"]
    service = "serviceError"
    query = "/{status}.html"
[http.services]
  # ... definition of error-handler-service and my-service

In this example, the error page URL is based on the status code (query=/{status}.html).

Configuration Options

status

The status option defines which status or range of statuses should result in an error page.

The status code ranges are inclusive (500-599 will trigger with every code between 500 and 599, 500 and 599 included).

You can define either a status code as a number (500), as multiple comma-separated numbers (500,502), as ranges by separating two codes with a dash (500-599), or a combination of the two (404,418,500-599).

service

The service that will serve the new requested error page.

In Kubernetes, you need to reference a Kubernetes Service instead of a Traefik service.

Host Header

By default, the client Host header value is forwarded to the configured error service. To forward the Host value corresponding to the configured error service URL, the passHostHeader option must be set to false.

query

The URL for the error page (hosted by service)).

There are multiple variables that can be placed in the query option to insert values in the URL.

The table below lists all the available variables and their associated values.