public final H2AsyncClientBuilder setIoSessionDecorator(final Decorator<IOSession> ioSessionDecorator) {
        this.ioSessionDecorator = ioSessionDecorator;
        return this;
    }
Sets the {@link IOSession} {@link Decorator} that will be use with the client's IOReactor.

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