React native React本机fetch api调用与post请求失败

我创建了一个fecthapi调用，如下所示

var model=new UserAnswer();
  model.category_id=2;
  model.exam_id=this.state.datasourece.exam.id;
  model.questions=this.state.answers;
  fetch(
    API.BASE_URL +
    API.SUBMIT_EXAM,
    {
      method: 'POST',
      headers: {
        Accept: 'application/json',
        'Content-Type': 'application/json',
        Authorization: 'Bearer ' + this.props.Login.User.access_token,
      },
      body:JSON.stringify(model)
    },
  )

{
  method: 'POST',
  headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
    Authorization: 'Bearer ' + this.props.Login.User.access_token,
  },
  body:JSON.stringify(model)
}

……等等。。但它并没有达到预期的效果，但我在《邮递员》中也做了同样的测试，我得到了结果

stringify（模型）将如下所示

{
"category_id": 2,
"exam_id": 9,
"questions": [
    {
        "question_id": 38,
        "user_answer_option_id": 145
    },
    {
        "question_id": 308,
        "user_answer_option_id": 1142
    },
    {
        "question_id": 309,
        "user_answer_option_id": 1146
    }
]

}

试试这个

---

谢谢。

我已经弄明白了问题所在。我刚刚更改了标题，如下所示

var model=new UserAnswer();
  model.category_id=2;
  model.exam_id=this.state.datasourece.exam.id;
  model.questions=this.state.answers;
  fetch(
    API.BASE_URL +
    API.SUBMIT_EXAM,
    {
      method: 'POST',
      headers: {
        Accept: 'application/json',
        'Content-Type': 'application/json',
        Authorization: 'Bearer ' + this.props.Login.User.access_token,
      },
      body:JSON.stringify(model)
    },
  )

{
  method: 'POST',
  headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
    Authorization: 'Bearer ' + this.props.Login.User.access_token,
  },
  body:JSON.stringify(model)
}

---

如果您在此处托管API共享，则一切正常

不起作用。