http2.ConfigureTransports and H2C

[Kirth Gersen]

i'm trying to use http client to connect in http/2 clear text (H2C).

this works:

var dialer = &net.Dialer{

Timeout: 5 * time.Second, // fail quick

FallbackDelay: -1, // don't use Happy Eyeballs

}

rt = &http2.Transport{

AllowHTTP: true,

DialTLS: func(network, addr string, cfg *tls.Config) (net.Conn, error) {

return dialer.Dial(network, addr)

},

}

....

rt.RoundTrip(some request)

but this doesn't:

// same dialer

var netTransport = http.DefaultTransport.(*http.Transport).Clone()

netTransport.DialContext = dialer.DialContext

var rt http.RoundTripper = netTransport

rt2, err := http2.ConfigureTransports(netTransport)

if err != nil {

log.Fatal(err)

}

rt2.AllowHTTP = true

....

rt.RoundTrip(some request)

complete code at: https://github.com/nspeed-app/http2issue/blob/main/main.go#L199

what am I missing ?

how to get a common transport that can do http/1.1, h2c and http/2 ?