QIODevice::write (QTcpSocket): device not open

Marek

Hi
I'm using qhttpengine in my server application to provide some API for React based website. I know it is old and I should switch to eg. Cutelyst
After I have switched to SSL with this API I have a problem:
When serwer is sending more data (like a 41kb PDF file encoded to Base64) QTcpSocket is being closed during transmission before I send the data, I can see in logs:

Warning: 2021-09-09 10:39:06 QIODevice::write (QTcpSocket): device not open
Debug: 2021-09-09 10:39:06 HttpServer::addHeadersAndWrite data.size 56843

and user receives:

Error: Transferred a partial file

Without SSL, no problem.
Where to look ? Is there some buffer size or something?
I'm also using QSslSocket in other application and if I set dataSize variable to quint64, I can send big files.

Best Regards
Marek

SGaist

Hi,

How have your switched to ssl ?

Marek

@SGaist Hi

By setting certificate in init function

void HttpServer::init() {
    const char *post_method="POST";
    const char *put_method="PUT";
    const char *options_method="OPTIONS";
    handler.registerMethod(this->getEndpointString(EndpointGetClients), [](QHttpEngine::Socket *socket) {
        HttpServer *p=static_cast<HttpServer*>(Vr().httpServer);
        p->processConnection(socket,QHttpEngine::Socket::Method::GET,EndpointGetClients);
    });
   ....
   if(Vr().webUseSsl) {
        QFile keyFile(":/path_to.key");
        if(!keyFile.open(QIODevice::ReadOnly)) {
            qWarning()<<"HttpServer::init can't open key";
        }
        QByteArray key_data=keyFile.readAll();
        QSslKey key(key_data, QSsl::Rsa,QSsl::Pem,QSsl::PrivateKey,QString("key_secret").toLocal8Bit().data());
        QList<QSslCertificate> certs = QSslCertificate::fromPath(":/path_to.crt");

        QSslConfiguration config;
        config.setPrivateKey(key);
        config.setLocalCertificateChain(certs);

        server.setSslConfiguration(config);
    }

    server.setHandler(&handler);

    if (!server.listen(QHostAddress(Vr().restApiIp),Vr().restApiPort)) {
        qCritical()<<"HttpServer::init unable to bind to a local port ip:"<<Vr().restApiIp<<" port:"<<Vr().restApiPort;
    } else {
        qDebug()<<"HttpServer::init listening on port:"<<server.serverPort();
    }
}

Best Regards
Marek