How to use the httptools.run_url_fixers function in httptools

to an academic publisher's website which points to a paper. The paper needs
    to be downloaded and the metadata should be stored.

    Returns a tuple of (paper, json_path, pdf_path, logpath).

    :param url: url to fetch and examine
    :type url: str
    """
    # store logs in tempfile
    (templogpath, loghandler) = loghijack()

    if paper is None:
        paper = Paper.create({})

    # clean up url if necessary
    url = run_url_fixers(url)

    # whether or not metadata has already been populated
    populated_metadata = False

    for (url2, response) in iterdownload(url, paper=paper):
        if is_response_pdf(response):
            log.debug("Got pdf.")
            pdfcontent = remove_watermarks(response.content)
            paper.pdf = pdfcontent
            store(paper)
            break

        paper.html = response.content

        # Was not pdf. Attempt to parse the HTML based on normal expected
        # HTML elements. The HTML elements may say that the actual pdf url