[KongchangAI]
Concept503 Service Unavailable / 503

HTTP 503

An HTTP status code indicating that the server is temporarily unavailable, typically due to overload or maintenance; clients can retry with exponential backoff.

Timeline (last 90 days)

Oct 20

HTTP 503 indicates temporary unavailability on the provider side and is usually unrelated to call frequency; 429 indicates the caller exceeded the per-unit-time quota, and the response headers often carry Retry-After. 503 is suited to exponential backoff retries, while 429 is better handled by switching to a backup model or deferring to the next period.

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Oct 18

AWS Bedrock documentation recommends retrying 503, while 429 requires checking the throttling configuration, because Bedrock quotas are tied to IAM policies.

Unverified50%
Oct 14

HTTP status codes that should be retried include: 429, 502, 503, 504, as well as network-layer failures such as connection resets and timeouts.

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