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

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# Compress
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Compress Responses before Sending them to the Client
{: .subtitle }
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![Compress](../../assets/img/middleware/compress.png)
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The Compress middleware uses gzip compression.
## Configuration Examples
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```yaml tab="Docker"
# Enable gzip compression
labels:
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- "traefik.http.middlewares.test-compress.compress=true"
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```
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```yaml tab="Kubernetes"
# Enable gzip compression
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: test-compress
spec:
compress: {}
```
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```yaml tab="Consul Catalog"
# Enable gzip compression
- "traefik.http.middlewares.test-compress.compress=true"
```
```json tab="Marathon"
"labels": {
"traefik.http.middlewares.test-compress.compress": "true"
}
```
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```yaml tab="Rancher"
# Enable gzip compression
labels:
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- "traefik.http.middlewares.test-compress.compress=true"
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```
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```yaml tab="File (YAML)"
# Enable gzip compression
http:
middlewares:
test-compress:
compress: {}
```
```toml tab="File (TOML)"
# Enable gzip compression
[http.middlewares]
[http.middlewares.test-compress.compress]
```
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!!! info
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Responses are compressed when the following criteria are all met:
* The response body is larger than the configured minimum amount of bytes (default is `1024`).
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* The `Accept-Encoding` request header contains `gzip`.
* The response is not already compressed, i.e. the `Content-Encoding` response header is not already set.
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If the `Content-Type` header is not defined, or empty, the compress middleware will automatically [detect](https://mimesniff.spec.whatwg.org/) a content type.
It will also set the `Content-Type` header according to the detected MIME type.
## Configuration Options
### `excludedContentTypes`
`excludedContentTypes` specifies a list of content types to compare the `Content-Type` header of the incoming requests and responses before compressing.
The responses with content types defined in `excludedContentTypes` are not compressed.
Content types are compared in a case-insensitive, whitespace-ignored manner.
```yaml tab="Docker"
labels:
- "traefik.http.middlewares.test-compress.compress.excludedcontenttypes=text/event-stream"
```
```yaml tab="Kubernetes"
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: test-compress
spec:
compress:
excludedContentTypes:
- text/event-stream
```
```yaml tab="Consul Catalog"
- "traefik.http.middlewares.test-compress.compress.excludedcontenttypes=text/event-stream"
```
```json tab="Marathon"
"labels": {
"traefik.http.middlewares.test-compress.compress.excludedcontenttypes": "text/event-stream"
}
```
```yaml tab="Rancher"
labels:
- "traefik.http.middlewares.test-compress.compress.excludedcontenttypes=text/event-stream"
```
```yaml tab="File (YAML)"
http:
middlewares:
test-compress:
compress:
excludedContentTypes:
- text/event-stream
```
```toml tab="File (TOML)"
[http.middlewares]
[http.middlewares.test-compress.compress]
excludedContentTypes = ["text/event-stream"]
```
### `minResponseBodyBytes`
`minResponseBodyBytes` specifies the minimum amount of bytes a response body must have to be compressed.
The default value is `1024`, which should be a reasonable value for most cases.
Responses smaller than the specified values will not be compressed.
```yaml tab="Docker"
labels:
- "traefik.http.middlewares.test-compress.compress.minresponsebodybytes=1200"
```
```yaml tab="Kubernetes"
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: test-compress
spec:
compress:
minResponseBodyBytes: 1200
```
```yaml tab="Consul Catalog"
- "traefik.http.middlewares.test-compress.compress.minresponsebodybytes=1200"
```
```json tab="Marathon"
"labels": {
"traefik.http.middlewares.test-compress.compress.minresponsebodybytes": 1200
}
```
```yaml tab="Rancher"
labels:
- "traefik.http.middlewares.test-compress.compress.minresponsebodybytes=1200"
```
```yaml tab="File (YAML)"
http:
middlewares:
test-compress:
compress:
minResponseBodyBytes: 1200
```
```toml tab="File (TOML)"
[http.middlewares]
[http.middlewares.test-compress.compress]
minResponseBodyBytes = 1200
```