Script to download content from URL anonymized (not tor) over proxies and dynamic content (JavaScript) processed

The script gets an URL as parameter and loads the content behind from the web into a file on a as parameter given location on the filesystem and a as parameter given filename. (example usage: [login to view URL] [login to view URL] /tempdirectory/ [login to view URL]) With each start of the script it uses an different IP address so that the webserver has difficulties to recognize, that all downloads came from the same source if you use the script more times (no tor). The script has to work with http and https. And it has to have the possibility for rendering the html page with javascript (as phantomjs does), so that dynamical content on a web page is processed and included in the download. It has to be as fast a possible (caching, don't load unnecessary files). There has also be the possibility to include cookies and header information in the request. So it may be good to use phantomjs or similar not programming the request and download on you own. The script is given in source code and works on macosx terminal. So perfect would be perl, phyton or java, but other could be ok (please ask)