javascript - "Cross origin requests are only supported for HTTP." with Node.js -


the following code in client app: 

const socket = io('${location.protocol}//${location.hostname}:8090');

is giving me following error in browser:

xmlhttprequest cannot load http://${location.protocol}/socket.io/?eio=3&transport=polling&t=lrlutss. cross origin requests supported http.

my client code run using node.js via npm start "http://localhost:3000" automatically refreshed in browser update code.

it appears ${location.protocol} not being substituted in string , it's still in url when socket.io tries use url. because browser not support specific es6 feature.

you can work around constructing url string old fashioned way string addition.

const socket = io(location.protocol + '//' + location.hostname + ':8090');

and, should using backticks string delimiters if expect substitution work reliably supported.


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