FetchError: invalid json response body at http://... reason: Unexpected token ＜ in JSON at position

问题的背景是：在写nextjs时，遇到的请求接口数据报的错

错误的原因是：调用url时没有加jsononly = 1

import { useState } from 'react';
import { GetServerSideProps, InferGetServerSidePropsType } from 'next';
// ...

export default function FriendCenterNextTest({data}: InferGetServerSidePropsType<typeof getServerSideProps>) {
  
  console.log('-------------fet', data);
  // ...
  
  return (
    // ...
  );
}

export const getServerSideProps: GetServerSideProps = async () => {
  // 要注意，这里定义好的httpConf.node_host形式类似于https://xxx
  const host = isNotEnv ? httpConf.node_host : httpConf.local_host;
  const url = `${host}/xxx?${qs.stringify({
    jsononly: 1,  // !是这里，需要加jsononly = 1
  })};`;

  let resData = null;

  await fetch(url)
    .then((res) => res.json())
    .then((body) => {
      resData = body;
    })
    .catch((e) => console.error('-----fetch error', e));

  return {
    props: {
      post: resData,
      data: resData?.data,
    },
  };
}