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v2.4.0 -- when client connet, the server response: Error during WebSocket handshake: Unexpected response code: 400 #3739

Answered by darrachequesne
Jason-oo asked this question in Q&A
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Hi! Are you using CORS in your application? Did you check the release notes? https://github.com/socketio/socket.io/releases/tag/2.4.0

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@Jason-oo
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