React native React native我使用fetch-to-post-image获取网络请求失败

我正在尝试向服务器发送blob映像，但react native显示错误network failed错误

get_data = async () => {
let file = new FormData();

fetch("https://jzzqf.sse.codesandbox.io/", {
  method: "POST",
  headers: {
    "Content-Type": "multipart/form-data; charset=utf-8",
    //"Content-Type": "text/html; charset=utf-8",
    "Access-Control-Allow-Origin": "*"
  },
  mode: "no-cors",
  body: file
})
  .then(function(response) {
    alert(response);
  })
  .catch(function(error) {
    alert(error);
  });

---

})

然后切换您的密码以处理拒绝承诺

.then(response => 
  {
    alert(response);
  }, reject => {
    // handle reject here
 })

---

是的，它显示错误有解决错误的方法吗