I think you should forget about catching Netflix streaming urls and downloading Netflix streaming movies straight from urls or anything like that, bit too complicated and there are simpler ways to capture and save Netflix streaming movies.
Best solution, if you ask me, is to screen capture and record Netflix streaming straight from the screen of computer with a powerful screen recorder program.
You can use for the job Audials Tunebite, for example. Its Netflix Recorder can record and save streaming Netflix movies fast and in good quality:
It's able to convert saved Netflix videos and movies to any format you need for your devices, that has always proven useful for me, plus you can actually use Audials Tunebite to capture streaming movies and videos from a huge number of streaming sites, video on demand subscriptions and so on.
Just remember that you should do this for personal use only.