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| # ContentType | ||
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| Handling ContentType auto-detection | ||
| {: .subtitle } | ||
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| The Content-Type middleware - or rather its unique `autoDetect` option - | ||
| 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. | ||
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| As a proxy, the default behavior should be to leave the header alone, | ||
| regardless of what the backend did with it. | ||
| However, the historic default was to always auto-detect and set the header if it was nil, | ||
| and it is going to be kept that way in order to support users currently relying on it. | ||
| This middleware exists to enable the correct behavior until at least the default one can be changed in a future version. | ||
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| !!! info | ||
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| As explained above, for compatibility reasons the default behavior on a router (without this middleware), | ||
| is still to automatically set the `Content-Type` header. | ||
| Therefore, given the default value of the `autoDetect` option (false), | ||
| simply enabling this middleware for a router switches the router's behavior. | ||
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| ## Configuration Examples | ||
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| ```yaml tab="Docker" | ||
| # Disable auto-detection | ||
| labels: | ||
| - "traefik.http.middlewares.autodetect.contenttype.autodetect=false" | ||
| ``` | ||
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| ```yaml tab="Kubernetes" | ||
| # Disable auto-detection | ||
| apiVersion: traefik.containo.us/v1alpha1 | ||
| kind: Middleware | ||
| metadata: | ||
| name: autodetect | ||
| spec: | ||
| contentType: | ||
| autoDetect: false | ||
| ``` | ||
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| ```yaml tab="Consul Catalog" | ||
| # Disable auto-detection | ||
| - "traefik.http.middlewares.autodetect.contenttype.autodetect=false" | ||
| ``` | ||
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| ```json tab="Marathon" | ||
| "labels": { | ||
| "traefik.http.middlewares.autodetect.contenttype.autodetect": "false" | ||
| } | ||
| ``` | ||
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| ```yaml tab="Rancher" | ||
| # Disable auto-detection | ||
| labels: | ||
| - "traefik.http.middlewares.autodetect.contenttype.autodetect=false" | ||
| ``` | ||
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| ```toml tab="File (TOML)" | ||
| # Disable auto-detection | ||
| [http.middlewares] | ||
| [http.middlewares.autodetect.contentType] | ||
| autoDetect=false | ||
| ``` | ||
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| ```yaml tab="File (YAML)" | ||
| # Disable auto-detection | ||
| http: | ||
| middlewares: | ||
| autodetect: | ||
| contentType: | ||
| autoDetect: false | ||
| ``` | ||
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| ## Configuration Options | ||
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| ### `autoDetect` | ||
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| `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. |
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