/**
* Fetch with automatic retry on 429 (rate limit) responses.
* Uses exponential backoff, respecting Retry-After header if present.
*/
export async function fetchWithRetry(
url: string,
options: RequestInit = {},
maxRetries = 3,
baseDelay = 2000
): Promise<Response> {
for (let attempt = 0; attempt < maxRetries; attempt++) {
const resp = await fetch(url, options);
if (resp.status === 429 && attempt < maxRetries - 1) {
const retryAfter = resp.headers.get("Retry-After");
const delay = retryAfter
? parseInt(retryAfter, 10) * 1000
: baseDelay * Math.pow(2, attempt);
await new Promise((r) => setTimeout(r, delay));
continue;
}
return resp;
}
throw new Error(`Request failed after ${maxRetries} retries: ${url}`);
}
