ContentType

Handling Content-Type auto-detection

The Content-Type middleware sets the Content-Type header value to the media type detected from the response content, when it is not set by the backend.

Info

The scope of the Content-Type middleware is the MIME type detection done by the core of Traefik (the server part). Therefore, it has no effect against any other Content-Type header modifications (e.g.: in another middleware such as compress).

Configuration Examples

Docker & Swarm

# Enable auto-detection
labels:
  - "traefik.http.middlewares.autodetect.contenttype=true"

Kubernetes

# Enable auto-detection
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: autodetect
spec:
  contentType: {}

Consul Catalog

# Enable auto-detection
- "traefik.http.middlewares.autodetect.contenttype=true"

File (YAML)

# Enable auto-detection
http:
  middlewares:
    autodetect:
      contentType: {}

File (TOML)

# Enable auto-detection
[http.middlewares]
  [http.middlewares.autodetect.contentType]

Configuration Options

autoDetect

Warning

autoDetect option is deprecated and should not be used. Moreover, it is redundant with an empty ContentType middleware declaration.

autoDetect specifies whether to let the Content-Type header, if it has not been set by the backend, be automatically set to a value derived from the contents of the response.