[nitely]

> A h2 proxy usually wouldn't proxy through the http2 connection, it would instead accept h2, load-balance each request to a backend over a h2 (or h1) connection.

Each connection need to keep state of all processed requests (the HPACK dynamic headers table), so all request for a given connection need to be proxied through the same connection. Not sure I got what you meant, though.

Apart from that, I think the second sentence of my comment makes clear there is no smuggling as long as the connection before/past proxy is http2, and it's not downgraded to http1. That's all that I meant.