Question

我认为我有愚蠢的问题，但我不知道如何解决这个问题。在express中的一篇文章中，我想向另一个服务器发送两个请求，我想得到两个客户端响应（在我的情况下是角度）。我尝试制作两个res.send(body)，但我收到错误Error: Can't set headers after they are sent.而我的问题是：这两个回复是否可能抛出并进入一个回复？

router.post('/paynow', function(req, res){
    request({
        method: 'POST',
        url: 'https://secure.snd.payu.com/pl/standard/user/oauth/authorize',
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
        },
        body: "xyz"
    },  function (error, response, body) {
            console.log('Status:', response.statusCode);
            console.log('Headers:', JSON.stringify(response.headers));
            console.log('Response:', body);
            res.send(body);
      }
    )
    request({
        method: 'GET',
        url: 'https://secure.snd.payu.com/api/v2_1/paymethods/',
        headers: {
            'Authorization': 'xyz'
        }}, function (error, response, body) {
                console.log('Status:', response.statusCode);
                console.log('Headers:', JSON.stringify(response.headers));
                console.log('Response:', body);
                res.send(body);
        }
    ),
})

Answer 1

您无法发送两个回复。但是您可以将两个请求结果合并到一个响应中。尝试使用promises：

router.post('/paynow', function(req, res){
  Promise.all([
    new Promise((resolve, reject) => {
      request({
        method: 'POST',
        url: 'https://secure.snd.payu.com/pl/standard/user/oauth/authorize',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
        },
        body: "xyz"
      },  function (error, response, body) {
        if (error) return reject(error)
        resolve(body)
      })
    }),
    new Promise((resolve, reject) => {
      request({
        method: 'POST',
        url: 'https://secure.snd.payu.com/pl/standard/user/oauth/authorize',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
        },
        body: "xyz"
      },  function (error, response, body) {
        if (error) return reject(error)
        resolve(body)
      })
    })
  ]).then(listOfResponses => {
    res.json(listOfResponses)
  })
})

Answer 2

很棒....首先你不能发送多个响应。即 res.send 一次＆amp;只有一次!! ......

所以你可以做的是......首先应该优先执行...在你的情况下首先执行授权然后 paymethods

所以正确的顺序是

$.ajax{ 
  url : /authorize,
  type : post,
  data : /same data,
  , success : function(response) {
         //within successs make pay method request as another ajax using the 
         //  response from previous authorize request


           $.ajax{
              url : /paymethods,
              data : response
           }
  }
}

同样将您的路线分开..

router.post('/authorize', function(req, res){
    request({
        method: 'POST',
        url: 'https://secure.snd.payu.com/pl/standard/user/oauth/authorize',
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
        },
        body: "xyz"
    },  function (error, response, body) {
            console.log('Status:', response.statusCode);
            console.log('Headers:', JSON.stringify(response.headers));
            console.log('Response:', body);
            res.send(body);
      }
    )}

和

router.post('/paynow', function(req, res){
       request({
    method: 'GET',
    url: 'https://secure.snd.payu.com/api/v2_1/paymethods/',
    headers: {
        'Authorization': 'xyz'
    }}, function (error, response, body) {
            console.log('Status:', response.statusCode);
            console.log('Headers:', JSON.stringify(response.headers));
            console.log('Response:', body);
            res.send(body);
    }
  )
}

在快递

2 个答案: