old_contents: import os
  from flask import Flask, render_template, send_from_directory, request
  
  
  app = Flask(__name__)
  
  
  @app.route('/')
  def index():
      return render_template('index.html')
  
  
  @app.route('/favicon.ico')
  def favicon():
      return send_from_directory(
          os.path.join(app.root_path, 'static/images'),
          'favicon.ico',
          mimetype='image/vnd.microsoft.icon'
      )
  
  
  @app.route('/browserconfig.xml')
  def browserconfig():
      return send_from_directory(
          os.path.join(app.root_path, 'static'),
          'browserconfig.xml',
          mimetype='application/xml'
      )
  
  
  @app.route('/apple-touch-icon.png')
  @app.route('/apple-touch-icon-precomposed.png')
  @app.route('/apple-touch-icon-57x57.png')
  @app.route('/apple-touch-icon-60x60.png')
  @app.route('/apple-touch-icon-72x72.png')
  @app.route('/apple-touch-icon-76x76.png')
  @app.route('/apple-touch-icon-114x114.png')
  @app.route('/apple-touch-icon-120x120.png')
  @app.route('/apple-touch-icon-144x144.png')
  @app.route('/apple-touch-icon-152x152.png')
  @app.route('/apple-touch-icon-180x180.png')
  @app.route('/mstile-70x70.png')
  @app.route('/mstile-144x144.png')
  @app.route('/mstile-150x150.png')
  @app.route('/mstile-310x150.png')
  @app.route('/mstile-310x310.png')
  def touch_icons():
      filename = request.path.lstrip('/')
      return send_from_directory(
          os.path.join(app.root_path, 'static/images'),
          filename,
          mimetype='image/png'
      )
  
  
  app.route('/.well-known/acme-challenge/OvlAng0N07PP9UtjjQGFeznblF4KjxzxwIt-VWbQxAc')
  def letsencrypt():
      return 'OvlAng0N07PP9UtjjQGFeznblF4KjxzxwIt-VWbQxAc.hbQJaEkIgdGI0f2W0WrPXPtmQ1VZsDtrqzA8UqVdNrw'
  
  
  if __name__ == '__main__':
      app.run(debug=True)
  
new_contents: import os
  from flask import Flask, render_template, send_from_directory, request
  
  
  app = Flask(__name__)
  
  
  @app.route('/')
  def index():
      return render_template('index.html')
  
  
  @app.route('/favicon.ico')
  def favicon():
      return send_from_directory(
          os.path.join(app.root_path, 'static/images'),
          'favicon.ico',
          mimetype='image/vnd.microsoft.icon'
      )
  
  
  @app.route('/browserconfig.xml')
  def browserconfig():
      return send_from_directory(
          os.path.join(app.root_path, 'static'),
          'browserconfig.xml',
          mimetype='application/xml'
      )
  
  
  @app.route('/apple-touch-icon.png')
  @app.route('/apple-touch-icon-precomposed.png')
  @app.route('/apple-touch-icon-57x57.png')
  @app.route('/apple-touch-icon-60x60.png')
  @app.route('/apple-touch-icon-72x72.png')
  @app.route('/apple-touch-icon-76x76.png')
  @app.route('/apple-touch-icon-114x114.png')
  @app.route('/apple-touch-icon-120x120.png')
  @app.route('/apple-touch-icon-144x144.png')
  @app.route('/apple-touch-icon-152x152.png')
  @app.route('/apple-touch-icon-180x180.png')
  @app.route('/mstile-70x70.png')
  @app.route('/mstile-144x144.png')
  @app.route('/mstile-150x150.png')
  @app.route('/mstile-310x150.png')
  @app.route('/mstile-310x310.png')
  def touch_icons():
      filename = request.path.lstrip('/')
      return send_from_directory(
          os.path.join(app.root_path, 'static/images'),
          filename,
          mimetype='image/png'
      )
  
  
  if __name__ == '__main__':
      app.run(debug=True)
  
subject: Revert "Let's encrypt"