问Google oAuth 2.0 API身份验证错误: Error 400-redirect_uri_mismatch(不符合策略)

EN

from django.shortcuts import render, redirect
from django.http import HttpRequest
from google_auth_oauthlib.flow import Flow
from google.auth.transport.requests import Request
from googleapiclient.discovery import build
from .models import CredentialsModel
from django.conf import settings
from django.core.exceptions import ObjectDoesNotExist
import os


os.environ['OAUTHLIB_INSECURE_TRANSPORT'] = '1'
os.environ['OAUTHLIB_RELAX_TOKEN_SCOPE'] = '1'
#Scopes are what we should be allowed to access
SCOPES = ['https://mail.google.com/', 'https://www.googleapis.com/auth/userinfo.email', 'https://www.googleapis.com/auth/userinfo.profile', 'openid']


"""
IF HAVING ISSUES WITH ANON USER:
Make sure you are on 127.0.0.1:8000, not localhost, both from the test-page and
the callback page. For some reason they are treated as different sessions and thus will have
issues maintaining a logged in user
"""

def oauth2callback(request):
    activeUser = request.user
    #URL is what we need to use for authentication
    authorization_response = request.build_absolute_uri()
    flow = Flow.from_client_secrets_file(
            settings.GOOGLE_OAUTH2_CLIENT_SECRETS_JSON,
            scopes=SCOPES,

            #This is where we are redirected after authentication
            redirect_uri='http://127.0.0.1:8000/google/oauth2callback')
    #Now get proper token
    flow.fetch_token(authorization_response = authorization_response)
    #print(request.user)
    #Now save in our database
    #print(flow.credentials)
    try :
        my_credential = CredentialsModel.objects.get(pk = activeUser)
    except ObjectDoesNotExist:
        CredentialsModel.objects.create(id = activeUser, credential = flow.credentials)
    else:
        my_credential.credential = flow.credentials
        my_credential.save()

    return redirect(flow.redirect_uri)     #activeUser.get_absolute_url())


  [1]: https://i.stack.imgur.com/2HXGP.png