func repoRootForImportDynamic(importPath string, mod ModuleMode, security web.SecurityMode) (*RepoRoot, error) {
	url, err := urlForImportPath(importPath)
	if err != nil {
		return nil, err
	}
	fmt.Printf("importPath: %s, url: %v, err: %v\n", importPath, url, err)
	resp, err := web.Get(security, url)
	if err != nil {
		msg := "https fetch: %v"
		if security == web.Insecure {
			msg = "http/" + msg
		}
		return nil, fmt.Errorf(msg, err)
	}
	body := resp.Body
	defer body.Close()
	bodyData, err := ioutil.ReadAll(body)
	imports, err := parseMetaGoImports(bufio.NewReader(bytes.NewBuffer(bodyData)), mod)
	fmt.Printf("imports: %v, err: %v, \nbody: %s, \nmod: %v\n", imports, err, bodyData, mod)
...
	// Find the matched meta import.
	mmi, err := matchGoImport(imports, importPath)
	fmt.Printf("imports: %v, importPath: %v, mmi: %v, err: %v\n", imports, importPath, mmi, err)

...
}