WebAssembly: Https request with custom certificate

  • Hi,
    I am working on a Qt 5.13 project in WebAssembly with emscripten 1.38.30.
    I am trying to create a GET HTTPS request to a server with a custom certificate.

    I added my certificate like this:

     QNetworkRequest _request = QNetworkRequest();
     QSslConfiguration sslconf = QSslConfiguration();

    It works on MinGW (windows) but not in WebAssembly. It seems that the compiler don't recognize QNetworkRequest and QSslConfiguration.

    I have also tried to include OpenSsl as a library (compiled in webassembly) as follow but didn't help:

    INCLUDEPATH += "$$PWD/openssl-wasm/include"
    LIBS += -L"$$PWD/openssl-wasm" -llibcrypto -llibssl

    WebAssembly doesn't support ssl / https request ? Is there a way to do it ?

  • Hi, Qt for WebAssembly can not use ssl, bugreport here: https://bugreports.qt.io/browse/QTBUG-76350

    Also https is very tricky over WebAssembly, the recommended way is to use WebSockets instead, more here https://emscripten.org/docs/porting/networking.html

  • @hskoglund thanks for your reply,

    Ok I see, but I can't use WebSockets because of the server side.

    I was thinking to use native javascript but I wouldn't be able to add a custom certificate.

    Is there an alternative ?

  • Well WebAssembly is pretty strict, if you want to make https requests you need to use a proxy/bridge program that translates from websockets to http, it's installed on a PC on the same LAN as the WebAssembly PC (or on the same PC). For example you could use this one: https://github.com/novnc/websockify

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