AttributeError: 'Request' object has no attribute 'is_xhr'求帮助

#Traceback (most recent call last):
File “C:\Users\Shinelon.virtualenvs\lesson1-XLEdKm5n\lib\site-packages\flask\app.py”, line 1982, in wsgi_app
response = self.full_dispatch_request()
File “C:\Users\Shinelon.virtualenvs\lesson1-XLEdKm5n\lib\site-packages\flask\app.py”, line 1614, in full_dispatch_request
rv = self.handle_user_exception(e)
File “C:\Users\Shinelon.virtualenvs\lesson1-XLEdKm5n\lib\site-packages\flask\app.py”, line 1517, in handle_user_exception
reraise(exc_type, exc_value, tb)
File “C:\Users\Shinelon.virtualenvs\lesson1-XLEdKm5n\lib\site-packages\flask_compat.py”, line 33, in reraise
raise value
File “C:\Users\Shinelon.virtualenvs\lesson1-XLEdKm5n\lib\site-packages\flask\app.py”, line 1612, in full_dispatch_request
rv = self.dispatch_request()
File “C:\Users\Shinelon.virtualenvs\lesson1-XLEdKm5n\lib\site-packages\flask\app.py”, line 1598, in dispatch_request
return self.view_functionsrule.endpoint
File “blockchain.py”, line 100, in full_chain
return jsonify(response), 200
File “C:\Users\Shinelon.virtualenvs\lesson1-XLEdKm5n\lib\site-packages\flask\json.py”, line 251, in jsonify
if current_app.config[‘JSONIFY_PRETTYPRINT_REGULAR’] and not request.is_xhr:
File “C:\Users\Shinelon.virtualenvs\lesson1-XLEdKm5n\lib\site-packages\werkzeug\local.py”, line 347, in getattr
return getattr(self._get_current_object(), name)
AttributeError: ‘Request’ object has no attribute ‘is_xhr’
求帮助