Previously, you could either add no 'upgrade' event handler, in which
case all upgrades were ignored, or add an 'upgrade' handler and all
upgrade attempts would effectively succeed and skip normal request
handling. This change adds a new shouldUpgradeCallback option to HTTP
servers, which receives the request details and returns a boolean that
controls whether the request should be upgraded.
PR-URL: https://github.com/nodejs/node/pull/59824
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
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