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8d852bba9b
aTLS.NewListener returns *LazyConn, not *tls.Conn, so Go's http.Server cannot detect TLS via type assertion and falls back to HTTP/1.x. When ALPN negotiates h2, the client sends HTTP/2 frames that the server fails to parse, causing HTTP 520 errors behind Cloudflare. Wrap HTTP handlers with h2c.NewHandler to intercept the HTTP/2 client preface and dispatch to http2.Server.ServeConn, consistent with DERP, v2rayhttp, naive, and v2raygrpclite services.
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