def _parse_request(header_data, ignore_bad_cookies=False):
    """Turn one or more lines of 'Cookie:' header data into a dict mapping
    cookie names to cookie values (raw strings).
    """
    cookies_dict = {}
    for line in Definitions.EOL.split(header_data.strip()):
        matches = Definitions.COOKIE_RE.finditer(line)
        matches = [item for item in matches]
        for match in matches:
            invalid = match.group('invalid')
            if invalid:
                if not ignore_bad_cookies:
                    raise InvalidCookieError(data=invalid)
                _report_invalid_cookie(invalid)
                continue
            name = match.group('name')
            values = cookies_dict.get(name)
            value = match.group('value').strip('"')
            if values:
                values.append(value)
            else:
                cookies_dict[name] = [value]
        if not matches:
            if not ignore_bad_cookies:
                raise InvalidCookieError(data=line)
            _report_invalid_cookie(line)
    return cookies_dict