没有“Access-Control-Allow-Origin" - 节点/Apache 端口问题 [英] No 'Access-Control-Allow-Origin' - Node / Apache Port Issue
问题描述
我已经使用 Node/Express 创建了一个小型 API，并尝试使用 Angularjs 提取数据，但是由于我的 html 页面在 localhost:8888 上的 apache 下运行，并且节点 API 在端口 3000 上侦听，所以我得到了 No 'Access-控制-允许-来源'.我尝试使用 node-http-proxy 和 Vhosts Apache 但没有太多成功，请参阅下面的完整错误和代码.
i've created a small API using Node/Express and trying to pull data using Angularjs but as my html page is running under apache on localhost:8888 and node API is listen on port 3000, i am getting the No 'Access-Control-Allow-Origin'. I tried using node-http-proxy and Vhosts Apache but not having much succes, please see full error and code below.
XMLHttpRequest 无法加载 localhost:3000.请求的资源上不存在Access-Control-Allow-Origin"标头.因此不允许访问 Origin 'localhost:8888'."
XMLHttpRequest cannot load localhost:3000. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'localhost:8888' is therefore not allowed access."
// Api Using Node/Express
var express = require('express');
var app = express();
var contractors = [
{
"id": "1",
"name": "Joe Blogg",
"Weeks": 3,
"Photo": "1.png"
}
];
app.use(express.bodyParser());
app.get('/', function(req, res) {
res.json(contractors);
});
app.listen(process.env.PORT || 3000);
console.log('Server is running on Port 3000')
角度代码
angular.module('contractorsApp', [])
.controller('ContractorsCtrl', function($scope, $http,$routeParams) {
$http.get('localhost:3000').then(function(response) {
var data = response.data;
$scope.contractors = data;
})
HTML
<body ng-app="contractorsApp">
<div ng-controller="ContractorsCtrl">
<ul>
<li ng-repeat="person in contractors">{{person.name}}</li>
</ul>
</div>
</body>
推荐答案
尝试将以下中间件添加到您的 NodeJS/Express 应用程序中(为了您的方便，我添加了一些注释):
Try adding the following middleware to your NodeJS/Express app (I have added some comments for your convenience):
// Add headers before the routes are defined
app.use(function (req, res, next) {
// Website you wish to allow to connect
res.setHeader('Access-Control-Allow-Origin', 'http://localhost:8888');
// Request methods you wish to allow
res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
// Request headers you wish to allow
res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');
// Set to true if you need the website to include cookies in the requests sent
// to the API (e.g. in case you use sessions)
res.setHeader('Access-Control-Allow-Credentials', true);
// Pass to next layer of middleware
next();
});
希望有帮助！
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