public final H2AsyncClientBuilder setRetryStrategy(final HttpRequestRetryStrategy retryStrategy) {
        this.retryStrategy = retryStrategy;
        return this;
    }
Sets {@link HttpRequestRetryStrategy} instance.
<p>
Please note this value can be overridden by the {@link #disableAutomaticRetries()}
method.
</p>

@return this instance.
httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/H2AsyncClientBuilder.java