def convert_url_to_download_info(self, url, project_name):
        """
        See if a URL is a candidate for a download URL for a project (the URL
        has typically been scraped from an HTML page).

        If it is, a dictionary is returned with keys "name", "version",
        "filename" and "url"; otherwise, None is returned.
        """
        def same_project(name1, name2):
            return normalize_name(name1) == normalize_name(name2)

        result = None
        scheme, netloc, path, params, query, frag = urlparse(url)
        if frag.lower().startswith('egg='):
            logger.debug('%s: version hint in fragment: %r',
                         project_name, frag)
        m = HASHER_HASH.match(frag)
        if m:
            algo, digest = m.groups()
        else:
            algo, digest = None, None
        origpath = path
        if path and path[-1] == '/':
            path = path[:-1]
        if path.endswith('.whl'):
            try:
                wheel = Wheel(path)
                if is_compatible(wheel, self.wheel_tags):
                    if project_name is None:
                        include = True
                    else:
                        include = same_project(wheel.name, project_name)
                    if include:
                        result = {
                            'name': wheel.name,
                            'version': wheel.version,
                            'filename': wheel.filename,
                            'url': urlunparse((scheme, netloc, origpath,
                                               params, query, '')),
                            'python-version': ', '.join(
                                ['.'.join(list(v[2:])) for v in wheel.pyver]),
                        }
            except Exception as e:
                logger.warning('invalid path for wheel: %s', path)
        elif path.endswith(self.downloadable_extensions):
            path = filename = posixpath.basename(path)
            for ext in self.downloadable_extensions:
                if path.endswith(ext):
                    path = path[:-len(ext)]
                    t = self.split_filename(path, project_name)
                    if not t:
                        logger.debug('No match for project/version: %s', path)
                    else:
                        name, version, pyver = t
                        if not project_name or same_project(project_name, name):
                            result = {
                                'name': name,
                                'version': version,
                                'filename': filename,
                                'url': urlunparse((scheme, netloc, origpath,
                                                   params, query, '')),
                                #'packagetype': 'sdist',
                            }
                            if pyver:
                                result['python-version'] = pyver
                    break
        if result and algo:
            result['%s_digest' % algo] = digest
        return result
See if a URL is a candidate for a download URL for a project (the URL
        has typically been scraped from an HTML page).

        If it is, a dictionary is returned with keys "name", "version",
        "filename" and "url"; otherwise, None is returned.