title: Retrieve PDF file generated on the fly and embedded in a HTML page
body: <p>I am trying to retrieve a PDF file embedded in a HTML page using Python 2.7. I have tried using urllib and BeautifulSoup, but with no success. My problem is that I can't find any PDF link when I display the source code of the page.</p>
  
  <p>Here is an example of the PDF I am trying to download : <a href="http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=FR&amp;language=fr&amp;productNumber=T1503&amp;brand=SIGMA&amp;PageToGoToURL=%2Fsafety-center.html" rel="nofollow noreferrer">link</a>.</p>
  
  <p>How can I download this file on my computer using Python ?</p>
  
  <p>EDIT : I just realized that the PDF is probably generated on the fly. Is it even possible to automatically download this type of file ?</p>