我已经使用spring boot和reactjs实现了oauth2服务器。

export const dologin = (username, password) => {

  let details = {
    username: username,
    password: password,
    grant_type: 'password'
  };

  let formBody = [];
  for (let property in details) {
    let encodedKey = encodeURIComponent(property);
    let encodedValue = encodeURIComponent(details[property]);
    formBody.push(encodedKey + "=" + encodedValue);
  }


  return fetch('/oauth/token', {
    method: 'POST',
    headers: {
        'Accept': 'application/json',
        'Authorization': 'Basic '+btoa('someclientid:dTHfdd4TRDvcsaSS'),
        "Content-type": "application/x-www-form-urlencoded; charset=utf-8"
    },
    body: formBody.join("&")
    }).then(res => {
      return res.json();
    }).then((data) => {
      console.log(data)
    }).catch((err) => {
      console.log(err);
    });
}

'Accept': 'application/json',

不知道为什么会这样?