Rate limiting

The rate limit HTTP middleware allows restricting the maximum number of allowed HTTP requests per second. Rate limiting can protect your application from denial of service (DOS) attacks. DOS attacks can be initiated by malicious 3rd parties but also by bugs in your software (a.k.a. a “friendly fire” DOS attack).

Component format

In the following definition, the maximum requests per second are set to 10:

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: ratelimit
spec:
  type: middleware.http.ratelimit
  version: v1
  metadata:
  - name: maxRequestsPerSecond
    value: 10

Spec metadata fields

Once the limit is reached, the request will return HTTP Status code 429: Too Many Requests.

Alternatively, the max concurrency setting can be used to rate limit applications and applies to all traffic regardless of remote IP or path.

Dapr configuration

To be applied, the middleware must be referenced in configuration. See middleware pipelines.

apiVersion: dapr.io/v1alpha1
kind: Configuration
metadata:
  name: appconfig
spec:
  httpPipeline:
    handlers:
    - name: ratelimit
      type: middleware.http.ratelimit

Related links

• Control max concurrently
• Middleware
• Dapr configuration
• Configuration overview