traefik/docs/content/middlewares/http/contenttype.md

title	description
Traefik ContentType Documentation	Traefik Proxy's HTTP middleware automatically sets the `Content-Type` header value when it is not set by the backend. Read the technical documentation.

ContentType

Handling Content-Type auto-detection {: .subtitle }

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

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

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

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

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

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