As far as I know, MDG hasn’t talked publicly about adding HTTP/2 support. They’re working hard on several other aspects of the Meteor ecosystem, that both they and the community (in some cases 
) have decided are a higher priority. That being said, join in the discussion and show your support via that issue. If you have ideas on how HTTP/2 support can be wired up, MDG and the community are listening.
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As an option, you can configure nginx to use http2 and reverse proxy a meteor app 
but it use http 1.1 for reverse proxy.