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

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---
title: "Traefik Compress Documentation"
description: "Traefik Proxy's HTTP middleware lets you compress responses before sending them to the client. Read the technical documentation."
---
# Compress
Compress Allows Compressing Responses before Sending them to the Client
{: .subtitle }
![Compress](../../assets/img/middleware/compress.png)
The Compress middleware supports Gzip, Brotli and Zstandard compression.
The activation of compression, and the compression method choice rely (among other things) on the request's `Accept-Encoding` header.
## Configuration Examples
```yaml tab="Docker & Swarm"
# Enable compression
labels:
- "traefik.http.middlewares.test-compress.compress=true"
```
```yaml tab="Kubernetes"
# Enable compression
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
name: test-compress
spec:
compress: {}
```
```yaml tab="Consul Catalog"
# Enable compression
- "traefik.http.middlewares.test-compress.compress=true"
```
```yaml tab="File (YAML)"
# Enable compression
http:
middlewares:
test-compress:
compress: {}
```
```toml tab="File (TOML)"
# Enable compression
[http.middlewares]
[http.middlewares.test-compress.compress]
```
!!! info
Responses are compressed when the following criteria are all met:
* The `Accept-Encoding` request header contains `gzip`, and/or `*`, and/or `br`, and/or `zstd` with or without [quality values](https://developer.mozilla.org/en-US/docs/Glossary/Quality_values).
If the `Accept-Encoding` request header is absent and no [defaultEncoding](#defaultencoding) is configured, the response won't be encoded.
If it is present, but its value is the empty string, then compression is disabled.
* The response is not already compressed, i.e. the `Content-Encoding` response header is not already set.
* The response`Content-Type` header is not one among the [excludedContentTypes options](#excludedcontenttypes), or is one among the [includedContentTypes options](#includedcontenttypes).
* The response body is larger than the [configured minimum amount of bytes](#minresponsebodybytes) (default is `1024`).
## Configuration Options
### `excludedContentTypes`
_Optional, Default=""_
`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.
!!! info
The `excludedContentTypes` and `includedContentTypes` options are mutually exclusive.
!!! info "In the case of gzip"
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.
!!! info "gRPC"
Note that `application/grpc` is never compressed.
```yaml tab="Docker & Swarm"
labels:
- "traefik.http.middlewares.test-compress.compress.excludedcontenttypes=text/event-stream"
```
```yaml tab="Kubernetes"
apiVersion: traefik.io/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"
```
```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"]
```
### `includedContentTypes`
_Optional, Default=""_
`includedContentTypes` specifies a list of content types to compare the `Content-Type` header of the responses before compressing.
The responses with content types defined in `includedContentTypes` are compressed.
Content types are compared in a case-insensitive, whitespace-ignored manner.
!!! info
The `excludedContentTypes` and `includedContentTypes` options are mutually exclusive.
```yaml tab="Docker & Swarm"
labels:
- "traefik.http.middlewares.test-compress.compress.includedcontenttypes=application/json,text/html,text/plain"
```
```yaml tab="Kubernetes"
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
name: test-compress
spec:
compress:
includedContentTypes:
- application/json
- text/html
- text/plain
```
```yaml tab="Consul Catalog"
- "traefik.http.middlewares.test-compress.compress.includedcontenttypes=application/json,text/html,text/plain"
```
```yaml tab="File (YAML)"
http:
middlewares:
test-compress:
compress:
includedContentTypes:
- application/json
- text/html
- text/plain
```
```toml tab="File (TOML)"
[http.middlewares]
[http.middlewares.test-compress.compress]
includedContentTypes = ["application/json","text/html","text/plain"]
```
### `minResponseBodyBytes`
_Optional, Default=1024_
`minResponseBodyBytes` specifies the minimum amount of bytes a response body must have to be compressed.
Responses smaller than the specified values will not be compressed.
```yaml tab="Docker & Swarm"
labels:
- "traefik.http.middlewares.test-compress.compress.minresponsebodybytes=1200"
```
```yaml tab="Kubernetes"
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
name: test-compress
spec:
compress:
minResponseBodyBytes: 1200
```
```yaml tab="Consul Catalog"
- "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
```
### `defaultEncoding`
_Optional, Default=""_
`defaultEncoding` specifies the default encoding if the `Accept-Encoding` header is not in the request or contains a wildcard (`*`).
There is no fallback on the `defaultEncoding` when the header value is empty or unsupported.
```yaml tab="Docker & Swarm"
labels:
- "traefik.http.middlewares.test-compress.compress.defaultEncoding=gzip"
```
```yaml tab="Kubernetes"
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
name: test-compress
spec:
compress:
defaultEncoding: gzip
```
```yaml tab="Consul Catalog"
- "traefik.http.middlewares.test-compress.compress.defaultEncoding=gzip"
```
```yaml tab="File (YAML)"
http:
middlewares:
test-compress:
compress:
defaultEncoding: gzip
```
```toml tab="File (TOML)"
[http.middlewares]
[http.middlewares.test-compress.compress]
defaultEncoding = "gzip"
```