Failure to make https request to api gateway

[YMa-FSDA]

Hello everyone!

I am trying to use SSLClient to make a https request to aws API Gateway. It seems like I can connect to the domain (e.g. akqookpn3l.execute-api.eu-west-1.amazonaws.com) while as you probably noticed that every url in api gateway comes with the stage path (i.e. akqookpn3l.execute-api.eu-west-1.amazonaws.com/test). And this is the point I fail to connect. The error message is always like the following:

(SSLClient)(SSL_ERROR)(connect): Failed to connect using m_client. Are you connected to the internet?

Does anyone has any idea how to resolve this? Thank you!