微信授权报错40002

做微信网页授权时，报这个错误是怎么回事

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sendGet - https://api.weixin.qq.com/sns/oauth2/access_token?appid=wx9785faeb968dc812&secret=38e556cd1ceb69155c28cbecc627aba9&code=041Vyv00015X3Q1ABb300gS1MN2Vyv0T&grant_type=authorization_code?null
2023-05-29 10:33:40.987 INFO 19848 --- [io-9998-exec-15] com.liframe.common.utils.HttpUtils : recv - {"errcode":40002,"errmsg":"invalid grant_type, rid: 64740eff-4a052ab7-42f6b1d7"}

把grant_type=authorization_code?null后面的?null内去掉