如何在golang中指定http引用?

是的,正如你从围棋本身的来源中所看到的,在 src/net/http/client.go

// Add the Referer header from the most recent
// request URL to the new one, if it's not https->http:
if ref := refererForURL(reqs[len(reqs)-1].URL, req.URL); ref != "" {
    req.Header.Set("Referer", ref)
}

as in the same sources :

// refererForURL returns a referer without any authentication info or
// an empty string if lastReq scheme is https and newReq scheme is http.
func refererForURL(lastReq, newReq *url.URL) string {
    // https://tools.ietf.org/html/rfc7231#section-5.5.2
    //   "Clients SHOULD NOT include a Referer header field in a
    //    (non-secure) HTTP request if the referring page was
    //    transferred with a secure protocol."
    if lastReq.Scheme == "https" && newReq.Scheme == "http" {
        return ""
}