Class: RetryInterceptor

RetryInterceptor class in the Terminal49 TypeScript SDK, automatically retrying failed requests on rate-limit and server errors with exponential backoff.

Class: RetryInterceptor

Retries transient failures with backoff. Two kinds of failure are handled:

• A response with a retryable status (429 / 5xx), handled in onResponse.
• A thrown transport error (DNS/connection/“fetch failed”), handled in onError — these never reach onResponse because fetch rejected.

Retries are gated by shouldRetryRequest: idempotent methods are always eligible, but non-idempotent writes are only retried when the caller supplied an Idempotency-Key header. 429 backoff honors the server’s Retry-After.

Constructors

Constructor

new RetryInterceptor(maxRetries, fetchImpl?): RetryInterceptor

Parameters

Parameter	Type	Default value
maxRetries	number	undefined
fetchImpl	(input, init?) => Promise<Response>	fetch

Returns

RetryInterceptor

Methods

onError()

onError(__namedParameters): Promise<Error | Response>

Recover from a thrown transport error by retrying eligible requests. If a retry produces a response we return it (openapi-fetch then runs the normal onResponse chain on it); otherwise we surface a normalized NetworkError so error mapping is consistent with the response path.

Parameters

Parameter	Type
__namedParameters	Pick<MiddlewareCallbackParams, "id" | "request"> & object

Returns

Promise<Error | Response>

---

onRequest()

onRequest(__namedParameters): Request

Parameters

Parameter	Type
__namedParameters	Pick<MiddlewareCallbackParams, "id" | "request">

Returns

Request

---

onResponse()

onResponse(__namedParameters): Promise<Response>

Parameters

Parameter	Type
__namedParameters	Pick<MiddlewareCallbackParams, "id" | "request"> & object

Returns

Promise<Response>