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Implements build-order step 2. CA gains LeafFor(host), signing and
caching per-host leaf certificates on demand. The proxy's CONNECT
handler now terminates TLS with the client using a matching leaf cert
instead of tunneling raw bytes, and forwards each request upstream
over its own independently negotiated TLS connection.
Client-side and upstream-side ALPN are negotiated separately rather
than one being forced to mirror the other: an http.Transport configured
via http2.ConfigureTransport auto-bridges HTTP/1.1 and HTTP/2 on each
side independently, so e.g. an HTTP/1.1-only client reaching an
HTTP/2-preferring origin still works instead of failing the handshake
(caught by testing curl --http1.1 against example.com before this fix).
Verified live: plain HTTP passthrough, HTTPS with default (H2) and
forced HTTP/1.1 clients, and that requests without the mitmux CA
trusted are correctly rejected.
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