title: How to download PDF file from server using Retrofit in Android?
body: <p>I have links of PDF files like "<a href="http://mywebsite/uploads/book1.pdf" rel="nofollow noreferrer">http://mywebsite/uploads/book1.pdf</a>".
  Now I want to download the file from that specific link and open in PDFviewer into my Android device.
  I want to do it using <code>retrofit</code>, I have tried many methods from stackoverflow but none worked for me, what is simplest code to download file from server using <code>retrofit</code> if I have all the links available.
  Thanks </p>