public final H2AsyncClientBuilder setIOSessionListener(final IOSessionListener ioSessionListener) {
        this.ioSessionListener = ioSessionListener;
        return this;
    }
Sets {@link IOSessionListener} listener.

@return this instance.
@since 5.2
httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/H2AsyncClientBuilder.java