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http-proxy-middleware option.onProxyReq:

Liz Gould-Leger 
'use strict';

var express = require('express');
var router = express.Router();

var proxy_filter = function (path, req) {
    return path.match('^/docs') && ( req.method === 'GET' || req.method === 'POST' );
};

var proxy_options = {
    target: 'http://localhost:8080',
    pathRewrite: {
        '^/docs' : '/java/rep/server1' // Host path & target path conversion
    },
    onError(err, req, res) {
        res.writeHead(500, {
            'Content-Type': 'text/plain'
        });
        res.end('Something went wrong. And we are reporting a custom error message.' + err);
    },
    onProxyReq(proxyReq, req, res) {
        if ( req.method == "POST" && req.body ) {
            // Add req.body logic here if needed....

           // ....

            // Remove body-parser body object from the request
            if ( req.body ) delete req.body;

            // Make any needed POST parameter changes
            let body = new Object();

            body.filename = 'reports/statistics/summary_2016.pdf';
            body.routeid = 's003b012d002';
            body.authid = 'bac02c1d-258a-4177-9da6-862580154960';

            // URI encode JSON object
            body = Object.keys( body ).map(function( key ) {
                return encodeURIComponent( key ) + '=' + encodeURIComponent( body[ key ])
            }).join('&');

            // Update header
            proxyReq.setHeader( 'content-type', 'application/x-www-form-urlencoded' );
            proxyReq.setHeader( 'content-length', body.length );

            // Write out body changes to the proxyReq stream
            proxyReq.write( body );
            proxyReq.end();
        }
    }
};

// Proxy configuration
var proxy = require( 'http-proxy-middleware' )( proxy_filter, proxy_options );

/* GET home page. */
router.get('/', function(req, res, next) {
    res.render('index', { title: 'Node.js Express Proxy Test' });
});

router.all('/document', proxy );

module.exports = router;
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4.25
4
David Small 95 points 

                                    // TIPS AND TRICK CUSTOM PROXY IN WEBPACK DEV SERVER BY restuwahyu13
//NOTE this method like using CRA in React

// manual proxy before
module.exports = {
	devServer: {
		open: true,
		compress: true,
		hot: true,
		inline: true,
		lazy: true,
		contentBase: resolve(process.cwd(), 'build'),
		port: process.env.PORT || 3000,
		proxy: {
          '/api/*', {
          	target: 'http://localhost:3001',
			secure: false,
			changeOrigin: true,
			headers: {
				'Access-Control-Allow-Origin': '*',
				'Access-Control-Allow-Credentials': '*',
				'Access-Control-Allow-Methods': '*'
			}
          }
        }
		liveReload: false
	}
}

// custom proxy after
module.exports = {
	devServer: {
    open: true,
    compress: true,
    hot: true,
    inline: true,
    watchContentBase: true,
    contentBase: resolve(process.cwd(), 'build'),
    historyApiFallback: true,
    before: (app, server, compiler) => {
      const fileExist = existsSync('./src/setupProxy.js')
      if (fileExist) {
        const pathProxy = resolve(process.cwd(), 'src/setupProxy')
        return require(`${pathProxy}`)(app)
      }
    },
    port: process.env.PORT || 3000,
    liveReload: false
  }
}

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