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Access-Control-Allow-Origin #131

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sanogomohamed opened this issue Mar 15, 2018 · 1 comment

sanogomohamed commented Mar 15, 2018

Hi. I am in chapter 8 of the book
when i'm doing npm start i get this error

Failed to load http://localhost:3000/socket.io/?EIO=3&transport=polling&t=M8dv7Le: The 'Access-Control-Allow-Origin' header has a value 'null' that is not equal to the supplied origin. Origin 'null' is therefore not allowed access.

cesc1989 commented Apr 18, 2018

I'm also facing this error. Funny thing is that in my personal computer it doesn't happen, it occurs in the computer at work.

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