How does Wechat developer tool simulate mobile phone ua to send requests?

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Mini Program is developed by Wechat developer tool. Sending an API request token to the backend will return "Token creation requests cannot be accessed from a browser.", which cannot be obtained on the browser. You can only upload a preview of the code and get it on the phone.
I think the backend should be judged by ua. How can Wechat"s developer tools modify it?

WeChat-Mini-Programs front-end javascript

Mar.28,2021

you don't understand the meaning of this error:
this is when you send a request, you need to get Wechat user information. But the browser does not have Wechat user information, so this prompt.
so there is a problem with your operation, this step request should be sent by Mini Program to api. Not backstage.

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