title: Set iframe src response from Flask
body: <p>Currently, I got a question about Flask application.</p>
  
  <p>I am developing a web app that need to generate reports (some auto-generated html files like junit report).</p>
  
  <p>On the report_dispay page, I have a navigation bar on the left on which there are multiple report titles (html links); and on the right side, there is iframe inside which the report will be displayed when one link is clicked. After the report is generated, I send back the URI (relative file location, i.e., "reports/html/index"). But when I set the src attribute of iframe, the flask command line print 404, cannot found "reports/html/index".</p>
  
  <p>Do you have any idea how to "register" the generated reports to the application?</p>
  
  <p>Thanks so much,
  Vycon</p>