访问写的页面不间断的提示502 Bad Gateway是什么意思呢？

Question

项目用node+express+ejs写的h5页面，所有的数据都是通过调取java第三方接口的数据，然后用ejs渲染，放到测试环境测试的时候不间断的服务挂掉、报错"502 Bad Gateway nginx "错误，请问如何解决呢？是获取接口的数据的问题还是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要好点，至少崩了会自动重启，这个是pm2发的错误邮件，新手表示看不懂，哪位能看下用了request和request-promise这两个插件请求数据

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)

Answer 1

nginx 的配置有问题。

Answer 2

应该是服务器的问题

Answer 3

服务器资源满了，跑不动

Answer 4

502， 说明nginx没问题，但是nginx到后端服务之间的通信有问题, 也就是“node+express+ejs”不能正常响应nginx转发过来的请求。

Answer 5

加了pm2，自动重启，这个是错误代码

 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)