Question ws websocket , Connection has not stublished , https (mixed content)

[mario2]

I am newbie to Websocket i found this project on github, and i want to integrate this project to my old PHP project in plesk vps

client.js :

connection.onopen = function () {
console.log("Connected to the server");
}

 

[Bitpalast]

I think that all is said including the solution in the screenshot that you have provided yourself. What is the question?