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Question

Node.js/Socket.io client side environment variable APP patform

Hi all, I am having a problem with creating a ‘Deploy to DO’ button for my app on the APP Platform. I am having a socket.io/node.js application and I need to pass an environment variable on my client-side:

let socket = io.connect('https://some-url.com', {
    reconnection: false,
    transports: ['websocket'],
    upgrade: false
});

I need to add an environment variable to pass the URL upon the deployment of the app. I tried with ${APP_URL} and with process.env.APP_URL but neither of those seems to work.

Thanks in advance!

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Denislav Gavrilov • January 4, 2021

Hey all, I somehow managed to use a workaround and I’m sharing it here in case somebody faces the same problem. I used the following code:

let url = window.location.href;
const {hostname} = new URL(url);

let socket = io.connect(`https://${hostname}`, {
    reconnection: false,
    transports: ['websocket'],
    upgrade: false
});

I am defining a variable to get the current URL, then I am using the URL constructor to extract the URL. I am then making a string with https://${hostname} to put the URL in use.

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