public static MinimalHttpAsyncClient createMinimal() {
        return createMinimal(H2Config.DEFAULT, Http1Config.DEFAULT);
    }
Creates {@link MinimalHttpAsyncClient} instance optimized for
HTTP/1.1 and HTTP/2 message transport without advanced HTTP protocol
functionality.
httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/HttpAsyncClients.java