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See discussion: #730 (comment)
I think this should be removed, instead callers should create their fetcher by themselves and give it load_html_rendertree_fetcher.
This function creates the fetcher, use it and returns it.. instead we probably want to have the calling function to create the fetcher for more flexibility:
let fetcher = fetcher::new();
let render_tree = load_html_rendertree(url, None, fetcher);