server.js

var express = require('express'),
    http = require('http');
bodyParser = require('body-parser'),
    proxy = require('express-http-proxy'),
    urlHelper = require('url');
const latexService = require('./latexService.js')

var app = express();

app.set('port', 3000);
app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json({ limit: '50mb' }))

app.get("/latex/convert", latexService.convert)
app.post("/latex/convert", bodyParser.json({ limit: '1mb' }), latexService.convert);


app.all(['/api/framework/v1/read/*', '/learner/framework/v1/read/*', '/api/channel/v1/read/*'], proxy('dev.sunbirded.org', {
    https: true,
    proxyReqPathResolver: function(req) {
        console.log('proxyReqPathResolver ', urlHelper.parse(req.url).path);
        return urlHelper.parse(req.url).path;
    },
    proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
        console.log('proxyReqOptDecorator')
            // you can update headers
        proxyReqOpts.headers['Content-Type'] = 'application/json';
        proxyReqOpts.headers['user-id'] = 'content-editor';
        proxyReqOpts.headers['authorization'] = 'Bearer ';
        return proxyReqOpts;
    }
}));


app.use(['/api', '/assets', '/action'], proxy('staging.sunbirded.org', {
    https: true,
    proxyReqPathResolver: function(req) {
        console.log('proxyReqPathResolver ', urlHelper.parse(req.url).path);
        return urlHelper.parse(req.url).path;
    },
    proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
        console.log('proxyReqOptDecorator')
            // you can update headers
        proxyReqOpts.headers['Content-Type'] = 'application/json';
        proxyReqOpts.headers['user-id'] = 'content-editor';
        proxyReqOpts.headers['authorization'] = 'Bearer ';
        return proxyReqOpts;
    }
}));

app.use(['/content/preview/*', '/content-plugins/*', '/assets/public/*'], proxy('https://staging.sunbirded.org', {
    https: true,
    proxyReqPathResolver: function(req) {
        return require('url').parse('https://staging.sunbirded.org' + req.originalUrl).path
    },
    proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
        console.log('proxyReqOptDecorator')
            // you can update headers 
        proxyReqOpts.headers['Content-Type'] = 'application/json';
        proxyReqOpts.headers['user-id'] = 'content-editor';
        proxyReqOpts.headers['authorization'] = 'Bearer ';
        return proxyReqOpts;
    }
}));

http.createServer(app).listen(app.get('port'), 3000);