content: from flask import render_template, request
  from app import db
  from app.errors import bp
  from app.api.errors import error_response as api_error_response
  
  
  def wants_json_response():
      return request.accept_mimetypes['application/json'] >= \
          request.accept_mimetypes['text/html']
  
  
  @bp.app_errorhandler(404)
  def not_found_error(error):
      if wants_json_response():
          return api_error_response(404)
      return render_template('errors/404.html'), 404
  
  
  @bp.app_errorhandler(500)
  def internal_error(error):
      db.session.rollback()
      if wants_json_response():
          return api_error_response(500)
      return render_template('errors/500.html'), 500
  