default void upgradeTls(HttpClientContext context,
                            FutureCallback<AsyncExecRuntime> callback) {
        upgradeTls(context);
        if (callback != null) {
            callback.completed(this);
        }
    }
Upgrades transport security of the active connection by using the TLS security protocol.

@param context the execution context.

@since 5.2
httpclient5/src/main/java/org/apache/hc/client5/http/async/AsyncExecRuntime.java