public RetryingClientBuilder useRetryAfter(boolean useRetryAfter) {
        this.useRetryAfter = useRetryAfter;
        return this;
    }
Whether retry should be attempted according to the {@code retryHeader} from the server or not.
The web server may request a client to retry after specific time with {@code retryAfter} header.
If you want to follow the direction from the server not by your {@link Backoff}, invoke this method
with the {@code useRetryAfter} with {@code true} to request after the specified delay.

@param useRetryAfter {@code true} if you want to retry after using the {@code retryAfter} header.
                     {@code false} otherwise
@return {@link RetryingClientBuilder} to support method chaining
core/src/main/java/com/linecorp/armeria/client/retry/RetryingClientBuilder.java