Question

所以在我的应用程序中，我有像这样设置的CORS标题

res.setHeader('Access-Control-Allow-Origin', '*')
res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept')

它就像一个魅力。我可以使用控制台从stackoverflow在这里做一个ajax请求并获得响应。一切似乎都运转正常。但是，只有一个网站，我从中向同一个文件发出ajax请求并得到一个错误，好像没有设置标头一样。这是错误

No 'Access-Control-Allow-Origin' header is present on the requested resource.

这是我的服务器端代码

import { WebApp } from 'meteor/webapp'
import ConnectRoute from 'connect-route'
import { Popups } from '../../imports/collections/popups/Popups'

const Fiber = Npm.require('fibers')

function onRoute (req, res, next) {
  res.setHeader('Access-Control-Allow-Origin', '*')
  res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept')
  let rawPostBody = ''
  let postData = {}
  req.on('data', function (chunk) {
    console.log('on data')
    rawPostBody += chunk.toString()
  })
  req.on('end', function () {
    console.log('on end')
    postData = getPostData(rawPostBody)
    console.log('postData', postData)
    console.log('postData.event', postData.event)
    console.log('postData._id', postData._id)
    Fiber(() => {
      Meteor.call('updateAnalytics', postData, (error, result) => {
        if (error) {
          console.log('updateAnalytics error', error)
        }
        if (result) {

        }
      })
      console.log('res', res)
      res.writeHead(200)
      res.end()
    }).run()
  })
}

function getPostData (rawPostBody) {
  let postData = {}
  let pairs = rawPostBody.split('&')
  for (let i = 0; i < pairs.length; i++) {
    let kv = pairs[i].split('=')
    postData[kv[0]] = decodeURIComponent((kv[1] + '').replace(/\+/g, '%20'))
  }
  return postData
}

const middleware = ConnectRoute(function (router) {
  // 2uik9 is for webhooks requests
  router.options('/handlePopups', function (req, res, next) {
    res.setHeader('Access-Control-Allow-Origin', '*')
    res.setHeader('Access-Control-Allow-Headers', 'Origin,X-Requested-With, Content-Type, Accept')
    res.writeHead(200)
    res.end()
  })
  router.post('/handlePopups', onRoute)
})

WebApp.connectHandlers.use(middleware)

这是我的ajax代码

const data = {event: 'impression', _id:'randomid'}
        $.ajax({
            method: 'POST',
            contentType: 'application/json',
            url: 'https://example.com/handlePopups',
            data
          }).success((res) => {
            console.log('ajax res', res)
          }).error((err) => {
            console.log('ajax err', err)
          })

为什么呢？怎么可能呢？

CORS不适用于特定网站

0 个答案: