title: Displaying pdf files in a web page from a sql database directly without needing to save them to the server file system
body: <p>I'm currently using an html embed tag to display a pdf file that is saved on the local server.  Is there a wayo to display a pdf file on my page without having to save it to the local file system of the server?  I just wand to pass it to the view from the controller in such a way that it can be displayed as a pdf in the page without having it stored on the file system directly.  </p>
  
  <p>Alternatively, is there a way to call a method to delete the pdf file from the server once the user has navigated away from the page they are viewing?  How do I tell if th euser has navicated away from the page and how do i cause that to trigger a method that will delete the file?  </p>