Firebase的云函数-getaddrinfo ENOTFOUND

Question

Firebase的云函数-getaddrinfo ENOTFOUND尝试向Paypal的API发出请求PayPal-Node-SDKexports.requestPayment = functions.https.onRequest((req, res) => {     return new Promise(function (fullfilled, rejected) {         paypal.payment.create(create_payment_json, {}, function (error, payment) {             if (error) {                 rejected(error);             } else {                 console.log("Create Payment Response");                 console.log(payment);                 res.status(200).send(JSON.stringify({                     paymentID: payment.id                })).end();                 fullfilled(payment);             }         });      });});但我经常会犯一个错误：Error: getaddrinfo ENOTFOUND api.sandbox.paypal.com api.sandbox.paypal.com:443     at errnoException (dns.js:28:10)     at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:76:26)我尝试过的事情：向完全不同的主机提出请求ENOTFOUND将请求包装为cors(req,res, ()=>{...})预演https://寄给主人有什么问题吗？