@cognigy/rest-api-client/dist/esm/connector/retryAfterDelay.js

Cognigy REST-Client

/**
 * The Retry-After response HTTP header indicates how long the user agent
 * should wait before making a follow-up request. There are three main cases
 * this header is used:
 *
 * - When sent with a 503 (Service Unavailable) response, this indicates how
 *   long the service is expected to be unavailable.
 * - When sent with a 429 (Too Many Requests) response, this indicates how
 *   long to wait before making a new request.
 * - When sent with a redirect response, such as 301 (Moved Permanently), this
 *   indicates the minimum time that the user agent is asked to wait before
 *   issuing the redirected request.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After
 */
export function retryAfterDelay(headers, lastRequestTime) {
    let retryAfterInMs = 0;
    if (headers) {
        const retryAfter = headers["retry-after"];
        if (/\d+/.test(retryAfter)) {
            retryAfterInMs = ~~retryAfter * 1000;
        }
        if (typeof retryAfter === "string" &&
            isNaN(new Date(retryAfter).getTime()) === false) {
            retryAfterInMs = new Date(retryAfter).getTime() - lastRequestTime;
        }
    }
    return retryAfterInMs;
}
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