traefik/docs/content/middlewares/maxconnection.md

MaxConnection

Limiting the Number of Simultaneous Clients {: .subtitle }

To proactively prevent services from being overwhelmed with high load, a maximum connection limit can be applied.

Configuration Examples

??? example "File -- Limiting to 10 simultaneous connections"

```toml
[http.middlewares]
  [http.middlewares.test-maxconn.maxconn]
  amount = 10 
```

??? example "Docker -- Limiting to 10 simultaneous connections"

```yml
a-container:
      image: a-container-image 
        labels:
          - "traefik.http.middlewares.test-maxconn.maxconn.amount=10"
```

Configuration Options

amount

The amount option defines the maximum amount of allowed simultaneous connections. The middleware will return an HTTP 429 Too Many Requests if there are already amount requests in progress (based on the same extractorfunc strategy).

extractorfunc

The extractorfunc defines the strategy used to categorize requests.

The possible values are:

• request.host categorizes requests based on the request host.
• client.ip categorizes requests based on the client ip.
• request.header.ANY_HEADER categorizes requests based on the provided ANY_HEADER value.