example proxy

// *****
// setupProxy.js

const { createProxyMiddleware } = require('http-proxy-middleware');

module.exports = function(app) {

    app.use('/api', createProxyMiddleware({
        target          : 'http://localhost:3000',
        changeOrigin    : true,
    }));

    app.use('/oauth', createProxyMiddleware({
        target          : 'https://auth.reltio.com',
        changeOrigin    : true,
    }));

    app.use('/reltio', createProxyMiddleware({
        target          : 'https://test-usg.reltio.com/',
        changeOrigin    : true,
    }));    
};


// *****
// example


const handleSubmit = async () => {
        
        const url            = `/oauth/token?username=movses.karagyozyan&password=KfVwYtiaNQZFHD7&grant_type=password`;
        const result         = await fetch(url, {
            headers     : {
                'Authorization'                 : 'Basic cmVsdGlvX3VpOm1ha2l0YQ=='
            }
        });

        const tokkenResult      = await result.json();

        const accessToken       = tokkenResult.access_token;
        const requestUrl        = `/reltio/permissions/44Po6oyqjrCGsOo`;
        const configApiCall     = await fetch(requestUrl, {
            headers         : {
            'Content-Type'  : 'application/json',
            'Authorization' : `Bearer ${accessToken}`
        }});

        const collection = await configApiCall.json();
        console.log(collection);
    };