訪問寫的頁面不間斷的提示502 Bad Gateway是什么意思呢？

項目用node+express+ejs寫的h5頁面，所有的數(shù)據(jù)都是通過調(diào)取java第三方接口的數(shù)據(jù)，然后用ejs渲染，放到測試環(huán)境測試的時候不間斷的服務(wù)掛掉、報錯"502 Bad Gateway nginx "錯誤，請問如何解決呢？是獲取接口的數(shù)據(jù)的問題還是node里面需要配置什么？

router.get(’/:id’,function(req,res,next){
    const params = {
        id:req.params.id
    }
    request({
        url: ${API}course/detail,
        method: req.method,
        json: true,
        headers: {
            “content-type”: “application/json”,
        },
        qs: params
        }, function(error, response, body) {
            if (!error && response.statusCode == 200) {
                res.render(‘learn’,body)
            }
     });
})

加了pm2要好點，至少崩了會自動重啟，這個是pm2發(fā)的錯誤郵件，新手表示看不懂，哪位能看下用了request和request-promise這兩個插件請求數(shù)據(jù)

at new StatusCodeError (/apps/srv/instance/nodejs/node_modules/request-promise-core/lib/errors.js:32:15)
    at Request.plumbing.callback (/apps/srv/instance/nodejs/node_modules/request-promise-core/lib/plumbing.js:104:33)
    at Request.RP$callback [as _callback] (/apps/srv/instance/nodejs/node_modules/request-promise-core/lib/plumbing.js:46:31)
    at Request.self.callback (/apps/srv/instance/nodejs/node_modules/request/request.js:186:22)
    at emitTwo (events.js:106:13)
    at Request.emit (events.js:191:7)
    at Request. (/apps/srv/instance/nodejs/node_modules/request/request.js:1163:10)
    at emitOne (events.js:96:13)
    at Request.emit (events.js:188:7)
    at IncomingMessage. (/apps/srv/instance/nodejs/node_modules/request/request.js:1085:12)
    at IncomingMessage.g (events.js:292:16)
    at emitNone (events.js:91:20)
    at IncomingMessage.emit (events.js:185:7)
    at endReadableNT (_stream_readable.js:974:12)
    at _combinedTickCallback (internal/process/next_tick.js:80:11)
    at process._tickDomainCallback (internal/process/next_tick.js:128:9)