我有一个React应用,试图将OAuth添加到Node / Express / MySQL后端。我的React应用程序托管在localhost:3000上,而快速服务器托管在localhost:4000上。我在react app的package.json文件中添加了“ proxy”:“ http://localhost:4000”,以将请求发送到服务器。 OAuth的授权Java来源为http://localhost:4000。授权重定向URI为http://localhost:4000/auth/google/redirect。
这些是我尝试访问服务器上路由时在浏览器控制台中遇到的错误:
有人说所请求的资源上没有'Access-Control-Allow-Origin'标头。
另一个人说:“跨域读取阻止(CORB)阻止了跨域响应。...使用MIME类型为text / html的邮件。”
我不知道我在做什么错,从昨天开始我就一直被困住。
Failed to load https://accounts.google.com/o/oauth2/v2/auth?response_type=code&redirect_uri=http%3A%2F%2Flocalhost%3A4000%2Fauth%2Fgoogle%2Fredirect&scope=profile&client_id={clientiddeletedbyme}.apps.googleusercontent.com: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3000' is therefore not allowed access.
Cross-Origin Read Blocking (CORB) blocked cross-origin response https://accounts.google.com/o/oauth2/v2/auth?response_type=code&redirect_uri=http%3A%2F%2Flocalhost%3A4000%2Fauth%2Fgoogle%2Fredirect&scope=profile&client_id={iddeletedbyme}apps.googleusercontent.com with MIME type text/html. See https://www.chromestatus.com/feature/5629709824032768 for more details.
这是我的应用程序的package.json文件中的代码:
{
"name": "workout_tracker",
"version": "0.1.0",
"private": true,
"dependencies": {
"axios": "^0.18.0",
"firebase": "^5.3.0",
"jw-paginate": "^1.0.2",
"jw-react-pagination": "^1.0.7",
"normalize.css": "^8.0.0",
"random-id": "0.0.2",
"react": "^16.5.2",
"react-dom": "^16.5.2",
"react-headroom": "^2.2.2",
"react-icons-kit": "^1.1.6",
"react-redux": "^5.0.7",
"react-router-dom": "^4.3.1",
"react-scripts-cssmodules": "^1.1.10",
"react-swipe-to-delete-component": "^0.3.4",
"react-swipeout": "^1.1.1",
"redux": "^4.0.0",
"redux-thunk": "^2.3.0"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
},
"devDependencies": {
"redux-devtools-extension": "^2.13.5"
},
"browserslist": [
">0.2%",
"not dead",
"not ie <= 11",
"not op_mini all"
],
"proxy":"http://localhost:4000"
}
这是我的应用程序中将请求发送到服务器的代码:
express=()=>{
axiosInstance.get("/google").then(res=>{
console.log(res);
}).catch(err=>console.log(err));
}
这是服务器中的代码
let express = require("express");
let cors= require("cors");
let mysql = require("mysql");
const util = require("util");
const passportSetup = require("./config/passport-setup");
const passport = require("passport");
let app = express();
let connection =mysql.createConnection({
host: "localhost",
user: "root",
password: "root",
database: "Workout_Tracker",
socketPath: '/Applications/MAMP/tmp/mysql/mysql.sock'
});
app.use(cors(
{origin:"http://localhost:3000",
credentials:true,
allowHeaders:"Content-Type"
}
));
app.options("/google", cors());
app.get("/google", cors(), passport.authenticate("google",{
scope:['profile']
}));
...omitted a bunch of SQL queries
app.listen(4000, () => console.log("Listening on port 4000!"));
答案 0 :(得分:1)
我应该使用浏览器导航到那里,而不是使用AJAX请求终结点。我使用了<a>
标签和href
为“ http://localhost:4000”的标签,它按预期工作。
答案 1 :(得分:1)
这是您需要安装的新中间件的示例代码,以表示在之前定义任何路由:
const cors = require('cors');
app.use('*', function(req, res, next) {
//replace localhost:8080 to the ip address:port of your server
res.header("Access-Control-Allow-Origin", "http://localhost:8080");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
res.header('Access-Control-Allow-Headers', 'Content-Type');
res.header('Access-Control-Allow-Credentials', true);
next();
});
//enable pre-flight
app.options('*', cors());
但是在复制和粘贴之前,只是要知道您需要npm install cors --save
才能导入cors。上面的示例代码仅表示:
axios.create({
withCredentials: true
});
说:无论是回应还是表达都同意使用CORS。同样在其他http库中。 以下是一些文档,您可以查看: https://developer.mozilla.org/en-US/docs/Glossary/Preflight_request https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
答案 2 :(得分:0)
这是我的将CORS与expressJs一起使用的示例,这需要在后端或服务器端完成。服务器停止从外部而不是客户端访问其API。
// IP's allowed all access this server
let whitelist = ['http://localhost:3000', 'http://127.0.0.1:3000'];
let corsOptions = {
origin: function (origin, callback) {
if (whitelist.indexOf(origin) !== -1) {
callback(null, true);
} else {
callback(new Error('Not allowed by CORS'));
}
}
};
// Cross-Origin Resource Sharing
app.use(cors(corsOptions));