@property<EOL><INDENT>def url(self):<DEDENT>
request_params = self._escaped_pagging()<EOL>sorted_request_params = sorted([(k, v) for k, v in request_params.items()])<EOL>req = requests.Request(<EOL>'<STR_LIT>', self.request_url, params=sorted_request_params).prepare()<EOL>return req.url<EOL>
This attribute retrieve the url that will be used as a HTTP request to
the Crossref API.

This attribute can be used compounded with query, filter,
sort, order and facet methods.

Examples:
    >>> from crossref.restful import Works
    >>> Works().query('zika').url
    'https://api.crossref.org/works?query=zika'
    >>> Works().query('zika').filter(prefix='10.1590').url
    'https://api.crossref.org/works?query=zika&filter=prefix%3A10.1590'
    >>> Works().query('zika').filter(prefix='10.1590').sort('published').order('desc').url
    'https://api.crossref.org/works?sort=published&order=desc&query=zika&filter=prefix%3A10.1590'
    >>> Works().query('zika').filter(prefix='10.1590').sort('published').order('desc').filter(has_abstract='true').query(author='Marli').url
    'https://api.crossref.org/works?sort=published&filter=prefix%3A10.1590%2Chas-abstract%3Atrue&query=zika&order=desc&query.author=Marli'