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koa2跨域

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“koa2-cors”: “^2.0.5”,

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const cors = require('koa2-cors');

app.use(cors({
    origin: function(ctx) {
        if (ctx.url === '/test') {
            return false;
        }
        return '*';
    },
    exposeHeaders: ['WWW-Authenticate', 'Server-Authorization'],
    maxAge: 5,
    credentials: true,
    allowMethods: ['GET', 'POST', 'DELETE'],
    allowHeaders: ['Content-Type', 'Authorization', 'Accept'],
}));
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