I suppose it's up to you in your Express backend to make sure that the right headers are sent back as described, and that your backend responds to OPTIONS requests if necessary. Express seems to have its own CORS guide here: expressjs.com/en/resources/middlew...
Hope this helps :)
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How do I solve CORS when using Webpack dev server?
A solution is probably with
expressjs'scorsto allow all whenprocess.env.NODE_ENV === 'development'.I suppose it's up to you in your Express backend to make sure that the right headers are sent back as described, and that your backend responds to OPTIONS requests if necessary. Express seems to have its own CORS guide here: expressjs.com/en/resources/middlew...
Hope this helps :)