code: def init_app(self, app):
          
          app.config.setdefault("SSLIFY_SUBDOMAINS", False)
          app.config.setdefault("SSLIFY_PERMANENT", False)
          app.config.setdefault("SSLIFY_SKIPS", None)
  
          self.hsts_include_subdomains = (
              self.hsts_include_subdomains or app.config["SSLIFY_SUBDOMAINS"]
          )
          self.permanent = self.permanent or self.app.config["SSLIFY_PERMANENT"]
          self.skip_list = self.skip_list or self.app.config["SSLIFY_SKIPS"]
  
          app.before_request(self.redirect_to_ssl)
          app.after_request(self.set_hsts_header)
docs: Configures the specified Flask app to enforce SSL.