cors: support cross-site access to socket.io #131
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A description of the changes proposed in the pull request and why
This PR enables cross-site access to uibuilder, for example so one can serve the front-end UI code from a standard javascript dev server running on one's laptop, such as using
vue-cli-service serve. By default socket.io allows cross-site access, however, uibuilder sends an x-clientid custom header which must be explicitly included in the CORS preflight response. IMHO this PR does not reduce security because cross-site access was already allowed, it just didn't work out of the box: an attacker could have simply dropped the x-clientid header to get through.Environment used for development and testing