Now that HTTP2 is in core, it should be supported by node-http-proxy.

My initial efforts to try to make this work result in the following errror:

_http_outgoing.js:490
    throw new TypeError(`Header name must be a valid HTTP Token ["${name}"]`);
    ^

TypeError: Header name must be a valid HTTP Token [":path"]

I think this is because in http-proxy/lib/http-proxy/common.js, setupOutgoing() is basically copying headers from the incoming request to the outgoing request, and HTTP2 headers start with colons, but HTTP1 headers cannot.