real android device post method recieve 403 code

[xwyzsn]

problem

I built an android app. It's all working fine on the emulator(both get and post requests). Once I build on a real android device, the get requests were fine but bad with post requests. I just received a 403 code

Android: 8.1.0

my post method is basically like this

      axios({
        url: this.api_url+"/api/study",
        method: "post",
        data: formdata,
        headers: {
          "Content-Type": "application/x-www-form-urlencoded",
        },
      }).then(()=>{this.reload()}).catch(e=>console.log(e))

[TobyMosque]

I think there is nothing with your app, that is just your api blocking your app.

[xwyzsn]

Thank you for your help! Certainly, that's my server blocked it.
To solve it, I just change the annotation CrossOrigin() from CrossOrigin(origins="my-webapp.com") to CrossOrigin(value="*") in spring which allows all domains. But I'm curious about why the get method could work well, and I also built a spa mode that works properly