Android客户端使用API返回错误请求

I am currently learning django and android. I created a REST API for my backend. The endpoints are working since I can GET/POST with Postman, Insomnia, and httpie. However, if I try it with my android app it gives the response 'Bad Request'. I've been working on it for many hours now. Could someone explain to me why is this happening?I am currently learning django and android. I c