ReactJS No 'Access-Control-Allow-Origin'

ReactJS No 'Access-Control-Allow-Origin'

本文关键字：Access-Control-Allow-Origin No ReactJS      更新时间：2023-09-26

我有一个问题，从我的网站链接加载我的字体。关于我所看到的，在我的server.js中有一个错误，CORS不存在于我的头部。现在，我的问题是我将如何插入头到我的服务器。js有人能帮助我吗?

这里是错误

Font from origin 'my website link'被Cross-Origin资源共享策略阻止加载:请求的资源上没有'Access-Control-Allow-Origin'标头。Origin 'http://localhost:3001'因此不允许访问

const app = express();
//
// Tell any CSS tooling (such as Material UI) to use all vendor prefixes if the
// user agent is not known.
// -----------------------------------------------------------------------------
global.navigator = global.navigator || {};
global.navigator.userAgent = global.navigator.userAgent || 'all';
//
// Register Node.js middleware
// -----------------------------------------------------------------------------
app.use(express.static(path.join(__dirname, 'public')));
app.use(cookieParser());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
//
// Authentication
// -----------------------------------------------------------------------------
app.use(expressJwt({
  secret: auth.jwt.secret,
  credentialsRequired: false,
  getToken: req => req.cookies.id_token,
}));
app.use(passport.initialize());
app.get('/login/facebook',
  passport.authenticate('facebook', { scope: ['email', 'user_location'], session: false })
);
app.get('/login/facebook/return',
  passport.authenticate('facebook', { failureRedirect: '/login', session: false }),
  (req, res) => {
    const expiresIn = 60 * 60 * 24 * 180; // 180 days
    const token = jwt.sign(req.user, auth.jwt.secret, { expiresIn });
    res.cookie('id_token', token, { maxAge: 1000 * expiresIn, httpOnly: true });
    res.redirect('/');
  }
);
//
// Register API middleware
// -----------------------------------------------------------------------------
app.use('/graphql', expressGraphQL(req => ({
  schema,
  graphiql: true,
  rootValue: { request: req },
  pretty: process.env.NODE_ENV !== 'production',
})));
//
// Register server-side rendering middleware
// -----------------------------------------------------------------------------
app.get('*', async (req, res, next) => {
  try {
    let css = [];
    let statusCode = 200;
    const data = { title: '', description: '', style: '', script: assets.main.js, children: '' };
    await UniversalRouter.resolve(routes, {
      path: req.path,
      query: req.query,
      context: {
        insertCss: (...styles) => {
          styles.forEach(style => css.push(style._getCss())); // eslint-disable-line no-underscore-dangle, max-len
        },
        setTitle: value => (data.title = value),
        setMeta: (key, value) => (data[key] = value),
      },
      render(component, status = 200) {
        css = [];
        statusCode = status;
        data.children = ReactDOM.renderToString(component);
        data.style = css.join('');
        return true;
      },
    });
    const html = ReactDOM.renderToStaticMarkup(<Html {...data} />);
    res.status(statusCode);
    res.send(`<!doctype html>${html}`);
  } catch (err) {
    next(err);
  }
});
//
// Error handling
// -----------------------------------------------------------------------------
const pe = new PrettyError();
pe.skipNodeFiles();
pe.skipPackage('express');
app.use((err, req, res, next) => { // eslint-disable-line no-unused-vars
  console.log(pe.render(err)); // eslint-disable-line no-console
  const statusCode = err.status || 500;
  const html = ReactDOM.renderToStaticMarkup(
    <Html
      title="Internal Server Error"
      description={err.message}
      style={errorPageStyle._getCss()}
      userAgent={req.headers['user-agent']}> // eslint-disable-line no-underscore-dangle
      {ReactDOM.renderToString(<ErrorPage error={err} />)}
    </Html>
  );
  res.status(statusCode);
  res.send(`<!doctype html>${html}`);
});
//
// Launch the server
// -----------------------------------------------------------------------------
/* eslint-disable no-console */
models.sync().catch(err => console.error(err.stack)).then(() => {
  app.listen(port, () => {
    console.log(`The server is running at http://localhost:${port}/`);
  });
});
/* eslint-enable no-console */

直接来自本网站，关于在express中启用CORS:

app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  next();
});
app.get('/', function(req, res, next) {
  // Handle the get for this route
});
app.post('/', function(req, res, next) {
 // Handle the post for this route
});

可以按如下所示插入标题。这是我的项目没有任何问题。

// Where app -> const app = express(); 
app.use(function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    next();
});
顺便说一下，你可以改进你的代码，将路由逻辑从app.js中分离出来，并使用Router: http://expressjs.com/es/api.html#router

希望能有所帮助。

安装歌珥从npm, 

npm install cors

并将其添加为中间件

app.use(cors());

google好运!

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