Almost working http2 server push with Link headers

main.go

package main

import (
    "log"
    "net/http"
    "net/http/httputil"
    "net/url"

    "github.com/tomnomnom/linkheader"
)

func main() {
    log.Printf("Starting in port 8000...")
    http.HandleFunc("/", someFunc)
    log.Fatal(http.ListenAndServe(":8000", nil))
}

func someFunc(w http.ResponseWriter, r *http.Request) {

    r.Host = "localhost:8080"
    u, _ := url.Parse("http://localhost:8080/")
    proxy := httputil.NewSingleHostReverseProxy(u)
    
    proxy.Transport = &myTransport{}

    // TODO: add http.Pusher when response contains Link headers with 'preload'

    proxy.ServeHTTP(w, r)
}

type myTransport struct {
}

func (t *myTransport) RoundTrip(request *http.Request) (*http.Response, error) {
    response, err := http.DefaultTransport.RoundTrip(request)

    links := linkheader.Parse( response.Header.Get("Link") )

    for _, link := range links {
      if link.Rel == "preload" && len(link.URL) > 0 {
        // How to return this information for someFunc() ?
        log.Printf("Can server push: %s",link.URL)
      }
    }

    return response, err
}