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81 lines
2.3 KiB
Markdown
81 lines
2.3 KiB
Markdown
---
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title: "Traefik HTTP Retry Documentation"
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description: "Configure Traefik Proxy's HTTP Retry middleware, so you can retry requests to a backend server until it succeeds. Read the technical documentation."
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---
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# Retry
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Retrying until it Succeeds
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{: .subtitle }
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<!--
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TODO: add schema
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-->
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The Retry middleware reissues requests a given number of times when it cannot contact the backend service.
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This applies at the transport level (TCP).
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If the service does not respond to the initial connection attempt, the middleware retries.
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However, once the service responds, regardless of the HTTP status code, the middleware considers it operational and stops retrying.
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This means that the retry mechanism does not handle HTTP errors; it only retries when there is no response at the TCP level.
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The Retry middleware has an optional configuration to enable an exponential backoff.
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## Configuration Examples
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```yaml tab="Docker & Swarm"
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# Retry 4 times with exponential backoff
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labels:
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- "traefik.http.middlewares.test-retry.retry.attempts=4"
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- "traefik.http.middlewares.test-retry.retry.initialinterval=100ms"
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```
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```yaml tab="Kubernetes"
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# Retry 4 times with exponential backoff
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apiVersion: traefik.io/v1alpha1
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kind: Middleware
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metadata:
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name: test-retry
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spec:
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retry:
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attempts: 4
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initialInterval: 100ms
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```
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```yaml tab="Consul Catalog"
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# Retry 4 times with exponential backoff
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- "traefik.http.middlewares.test-retry.retry.attempts=4"
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- "traefik.http.middlewares.test-retry.retry.initialinterval=100ms"
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```
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```yaml tab="File (YAML)"
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# Retry 4 times with exponential backoff
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http:
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middlewares:
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test-retry:
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retry:
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attempts: 4
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initialInterval: 100ms
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```
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```toml tab="File (TOML)"
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# Retry 4 times with exponential backoff
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[http.middlewares]
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[http.middlewares.test-retry.retry]
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attempts = 4
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initialInterval = "100ms"
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```
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## Configuration Options
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### `attempts`
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_mandatory_
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The `attempts` option defines how many times the request should be retried.
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### `initialInterval`
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The `initialInterval` option defines the first wait time in the exponential backoff series. The maximum interval is
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calculated as twice the `initialInterval`. If unspecified, requests will be retried immediately.
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The value of initialInterval should be provided in seconds or as a valid duration format, see [time.ParseDuration](https://golang.org/pkg/time/#ParseDuration).
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