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並前往https://support.glitch.com/t/unable-to-connect-to-socket-io-after-upgrading-from-2-3-0-to-3-0-0/34094

Unable to connect to socket.io after upgrading from 2.3.0 to 3.0.0

Access to XMLHttpRequest at 'GLITCHURL' from origin 'LOCALURL' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is ...

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