Node.js filtering symbol server to avoid unnecessary symbol queries when debugging on slow connections.

config

var config = {
    forward_server: 'msdl.microsoft.com',
    forward_path: '/download/symbols',
    forward_port: 80,
    allow_list: [
        /\/ntdll.pdb\//
    ],
};
module.exports = config;

proxy.js

var http = require('http');
var sys = require('util');
var config = require('./config');

http.createServer(function(request, response) {
  sys.log('Request for ' + request.url);

  var allow = config.allow_list.reduce(function (prev, next) {
	  if (!prev) {
		  prev = next.test(request.url);
	  }
	  return prev;
  }, false);

  if (allow) {
	  var proxy = http.createClient(config.forward_port, config.forward_server);
	  var proxy_request = proxy.request(request.method, config.forward_path + request.url, request.headers);
	  proxy_request.addListener('response', function (proxy_response) {
		proxy_response.addListener('data', function(chunk) {
		  response.write(chunk, 'binary');
		});
		proxy_response.addListener('end', function() {
		  response.end();
		});
		sys.log('Response for ' + request.url + ': ' + proxy_response.statusCode);
		response.writeHead(proxy_response.statusCode, proxy_response.headers);
	  });
	  request.addListener('data', function(chunk) {
		proxy_request.write(chunk, 'binary');
	  });
	  request.addListener('end', function() {
		proxy_request.end();
	  });
  }
  else {
	  sys.log('Blocked request ' + request.url);
	  response.end();
  }
}).listen(1337);