我想根据API响应更新firebase数据库中的一个字段，但是当我在google cloud中测试这个函数时，我得到了一个400错误。不确定我错过了什么：

import functions from 'firebase-functions';
import admin from 'firebase-admin';
import axios from 'axios';
const { initializeApp, credential: _credential, firestore} = admin;
admin.initializeApp();

const db = firestore();  

async function UpdateCountField() {
  console.log("Updating count task start point.");
  const query = db.collection('users').where('count', '==', '');
  return query.get().then(async snapshot => {
    console.log(query.get('erd'));
    let resptoken =  await axios.get(
        `https://api/${query.get('erd');
      result = resptoken.data;
    const promises = snapshot.docs.map(doc => doc.ref.update({ 'count': '${result}' }));
    return Promise.all(promises)
  })
  }