Testing HTTPS with Android Emulator and local API server

[gween]

I'm trying to test my API server locally with HTTPS using self signed certificates. When I try:

request.setUrl(QUrl("https://10.0.2.2:8999/test/"));
nAccessMang->post(request, p.query().toUtf8());

I get the error:

"SSL handshake failed: The host name did not match any of the valid hosts for this certificate"

Noting that making an https get request in a similar way works just fine:

request.setUrl(QUrl("https://www.google.com"));
nAccessMang->get(request);

Also, http works without errors when making the request to my local API server.

request.setUrl(QUrl("http://10.0.2.2:8999/test/"));
nAccessMang->post(request, p.query().toUtf8());

Here are the steps I took to get the above error:

1. First try this on its own (just adding https to my request):

request.setUrl(QUrl("https://10.0.2.2:8999/test/"));
... # get and set parameters from form.
nAccessMang->post(request, p.query().toUtf8());

2. Figure I need to add a certificate. So I created a self signed certificate:

openssl genrsa 2048 > key.key
chmod 400 key.key
openssl req -new -x509 -nodes -sha256 -days 365 -key key.key -subj "/CN=localhost" -out crt.crt
# I have also tried the Android Emulator's IP for the host machine as the CN:
# openssl req -new -x509 -nodes -sha256 -days 365 -key key.key -subj "/CN=10.0.2.2" -out crt.crt

I have also tried using the following config when creating the certificate:

# ssl.cnf
[req]
req_extensions = v3_req
distinguished_name = req_distinguished_name
prompt = no
[req_distinguished_name]
C = US
ST = CA
L = City
O = Test
OU = Division
CN = Test.com # tried 10.0.2.2 here as well.
[ v3_req ]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation
subjectAltName = @alt_names
[alt_names]
DNS.1 = localhost
DNS.2 = test_server
IP.1 = 127.0.0.1
IP.2 = 10.0.2.2

# then

openssl req -new -x509 -nodes -sha256 -days 365 -key key.key -out crt.crt -config ssl.cnf

3. Add cert to qrc file

4. Add to code

    QSslConfiguration config = QSslConfiguration();
    config.setProtocol(QSsl::TlsV1_2OrLater);

    QFile file(":/ssl/crt.crt");
    file.open(QIODevice::ReadOnly);
    const QByteArray bytes = file.readAll();
    file.close();

    const QSslCertificate certificate(bytes);
    QList<QSslCertificate> certs(1);
    certs.append(certificate);
    config.addCaCertificates(certs);

    request.setSslConfiguration(config);

    request.setUrl(QUrl("https://10.0.2.2:8999/test/"));
    ... # get and set parameters from form.
    nAccessMang->post(request, p.query().toUtf8());

What am I missing to successfully make this https request to my local API server for testing?