1. module cors-anywhere
   1. function cors-anywhere.createServer (options)

module cors-anywhere

function cors-anywhere.createServer (options)

• description and source-code

  function createServer(options) {
    options = options || {};
  
    // Default options:
    var httpProxyOptions = {
      xfwd: true,            // Append X-Forwarded-* headers
    };
    // Allow user to override defaults and add own options
    if (options.httpProxyOptions) {
      Object.keys(options.httpProxyOptions).forEach(function(option) {
        httpProxyOptions[option] = options.httpProxyOptions[option];
      });
    }
  
    var proxy = httpProxy.createServer(httpProxyOptions);
    var requestHandler = getHandler(options, proxy);
    var server;
    if (options.httpsOptions) {
      server = require('https').createServer(options.httpsOptions, requestHandler);
    } else {
      server = require('http').createServer(requestHandler);
    }
  
    // When the server fails, just show a 404 instead of Internal server error
    proxy.on('error', function(err, req, res) {
      if (res.headersSent) {
        // This could happen when a protocol error occurs when an error occurs
        // after the headers have been received (and forwarded). Do not write
        // the headers because it would generate an error.
        return;
      }
      res.writeHead(404, {'Access-Control-Allow-Origin': '*'});
      res.end('Not found because of proxy error: ' + err);
    });
    proxy.on('proxyRes', onProxyResponse);
  
    return server;
  }

• example usage

  ...
  
  ```javascript
  // Heroku defines the environment variable PORT, and requires the binding address to be 0.0.0.0
  var host = process.env.PORT ? '0.0.0.0' : '127.0.0.1';
  var port = process.env.PORT || 8080;
  
  var cors_proxy = require('cors-anywhere');
  cors_proxy.createServer({
      originWhitelist: [], // Allow all origins
      requireHeader: ['origin', 'x-requested-with'],
      removeHeaders: ['cookie', 'cookie2']
  }).listen(port, host, function() {
      console.log('Running CORS Anywhere on ' + host + ':' + port);
  });
  ...