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
| Field | Details | Example |
|---|---|---|
maxRequestsPerSecond |
The maximum requests per second by remote IP. The component looks at the X-Forwarded-For and X-Real-IP headers to determine the caller’s IP. |
10 |
Once the limit is reached, the requests will fail with HTTP Status code 429: Too Many Requests.
Important
The rate limit is enforced independently in each Dapr sidecar, and not cluster-wide.Alternatively, the max concurrency setting can be used to rate-limit applications and applies to all traffic, regardless of remote IP, protocol, 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
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