问尝试从api - dialogflow获取json时出现解析错误

EN

Error: Parse Error
at Error (native)
at Socket.socketOnData (_http_client.js:363:20)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at readableAddChunk (_stream_readable.js:176:18)
at Socket.Readable.push (_stream_readable.js:134:10)
at TCP.onread (net.js:559:20)

API Request: api.iextrading.com/1.0/stock/MSFT/company

'use strict';

const http = require('http');
const functions = require('firebase-functions');

const host = 'api.iextrading.com';

exports.dialogflowFirebaseFulfillment = functions.https.onRequest((req, res)     => {
  // Get the company
  let company = req.body.queryResult.parameters['company_name']; // city is a required param

  // Call the iex API
  callCompanyApi(company).then((output) => {
    res.json({ 'fulfillmentText': output }); 
  }).catch(() => {
    res.json({ 'fulfillmentText': `I don't know this company`});
  });
});

function callCompanyApi (company) {
  return new Promise((resolve, reject) => {
    // Create the path for the HTTP request to get the company
    let path = '/1.0/stock/' + company + '/company';
    console.log('API Request: ' + host + path);

    // Make the HTTP request to get the company info
    http.get({host: host, path: path}, (res) => {
    let body = ''; // var to store the response chunks
    res.on('data', (d) => { body += d; });// store each response chunk
    res.on('end', () => {
    // After all the data has been received parse the JSON for desired data
        console.log(body);
        let response = JSON.parse(body);
        let description = response['description'];

    // Create response
        let output = `${description}`

    // Resolve the promise with the output text
        console.log(output);
        resolve(output);
      });
      res.on('error', (error) => {
      console.log(`Error calling the iex API: ${error}`)
      reject();
      });
    });
  });
}