As per the documentation for the Go Flexible environment <https://cloud.google.com/appengine/docs/flexible/go/how-requests-are-handled#not_supported>, websockets in App Engine Flex are not yet supported. The early access form <https://docs.google.com/forms/d/e/1FAIpQLSf7KBmhhYTfJBctmelgEQuBQM2nYFvGo3o2_lBY0iFmuKbcUw/viewform> I previously linked to also mentions that it is looking for people to test websocket functionality for both standard and flexible environments.
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