text: # coding: utf-8
  from quokka.core.templates import render_template
  
  
  def configure(app):
      @app.errorhandler(403)
      def forbidden_page(*args, **kwargs):
          """
          The server understood the request, but is refusing to fulfill it.
          Authorization will not help and the request SHOULD NOT be repeated.
          If the request method was not HEAD and the server wishes to make public
          why the request has not been fulfilled, it SHOULD describe the
          reason for
          the refusal in the entity. If the server does not wish to make this
          information available to the client, the status code 404 (Not Found)
          can be used instead.
          """
          return render_template("errors/access_forbidden.html"), 403
  
      @app.errorhandler(404)
      def page_not_found(*args, **kwargs):
          """
          The server has not found anything matching the Request-URI.
          No indication
          is given of whether the condition is temporary or permanent.
          The 410 (Gone)
          status code SHOULD be used if the server knows, through some internally
          configurable mechanism, that an old resource is permanently unavailable
          and has no forwarding address. This status code is commonly used when
          the
          server does not wish to reveal exactly why the request has been
          refused,
          or when no other response is applicable.
          """
          return render_template("errors/page_not_found.html"), 404
  
      @app.errorhandler(405)
      def method_not_allowed_page(*args, **kwargs):
          """
          The method specified in the Request-Line is not allowed for the
          resource
          identified by the Request-URI. The response MUST include an
          Allow header
          containing a list of valid methods for the requested resource.
          """
          return render_template("errors/method_not_allowed.html"), 405
  
      @app.errorhandler(500)
      def server_error_page(*args, **kwargs):
          return render_template("errors/server_error.html"), 500
  
      # URLBUILD Error Handlers
      def admin_icons_error_handler(error, endpoint, *args, **kwargs):
          "when some of default dashboard button is deactivated, avoids error"
          if endpoint in [item[0] for item in app.config.get('ADMIN_ICONS', [])]:
              return '/admin'
          raise error
  
      app.url_build_error_handlers.append(admin_icons_error_handler)
  