我在从我网站的链接加载字体时遇到问题。据我所见，我的 server.js 中有一个错误，即 CORS 不存在于我的 header 中。现在，我的问题是如何将 header 插入我的 server.js 有人可以帮助我吗？
这里是错误
Font from origin 'my website link' has been blocked from loading by Cross-Origin Resource Sharing policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3001' is therefore not allowed access
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 */
最佳答案
直接来自 this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
});
关于javascript - ReactJS 没有 'Access-Control-Allow-Origin'，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38909259/