WebAssembly and remote objects module

[magrif]

Hello everyone.
I have installed Qt 5.15.1 (from Qt Installer) and Emscripten 1.37.
I try execute next code

    QRemoteObjectHost host;
    qDebug() << host.setHostUrl(QUrl("tcp://127.0.0.1:12121"));

and get fail at console of browser:

QNativeSocketEngine::initialize unable to inline out-of-band data
qtloader.js:382 qt.remoteobjects:  Listen failed for URL: QUrl("tcp://127.0.0.1:12121")
qtloader.js:382 qt.remoteobjects:  QAbstractSocket::UnknownSocketError

Same for QWebSocketServer and QTcpServer

What is wrong? It's possible to use QtRemoteObject module with WASM?

[lorn.potter]

WebAssembly as a platform, does not have native support for servers (same as javascript). Emscripten does support using servers via proxy, but that requires a real server.
As well, Qt WebAssembly does not yet support emscripten tcp proxy as it requires to run main() in a webworker and pass graphical data to the main thread for canvas access.