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Consider the video of the following web-page (you need to log-in with your facebook account or similar for watching it):

streaming video

common chrome extensions locate the source file of the video at:

link of source video

from where I can download it.

I would like to know:

Searching on the surface of the web-page source code, that link can't be found. At high level of abstraction, how such extensions parse the web page and locate that link?

Johan
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    I don't see a video on that webpage (do we need to log in?). If the link is inserted dynamically, then you'd need to wait until it's there before looking for the source. – Teepeemm Jun 02 '16 at 14:38
  • Are you trying to make people login to this? I am not randomly logging it to an Italian website. It's also _not guaranteed_ that you can just steal any video like that, there are measures in place to prevent this. And I can't see the video (without logging in I guess) either, so it might be flash or silverlight? – somethinghere Jun 03 '16 at 11:36

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