Download PDFs in Cordova InAppBrowser (3.1.0)

My result is now, that inAppBrowser by default isn't capable of handling Downloads at all and doesn't even process links with a file suffix like ".pdf".

a) So one workaround is to open the file in Google Docs by rewriting the link. This works because it's no more a PDF Document, but an external link:

b) Use the "beforeload" event to decide which browser to use before the link is further processed:

var app = {
  [...]
  _launchWebApp: function () {
    // Set global variables:
    // previousUrl = null;
    // Open URL in inappbrowser:
    var webAppWindow = cordova.InAppBrowser.open(this.config.webAppUrl, '_blank','location=no,beforeload=get,zoom=no,toolbar=no,enableViewportScale=yes');
    // Register events:
    webAppWindow.addEventListener('beforeload', this.onBeforeLoad.bind(this, webAppWindow), false);
  },
  /**
  *
  */
  onBeforeLoad: function(webAppWindow, params, callback){
    // Special handling of downloads. InAppBrowser doesn't handle them
    // so we have to manually preprocess and open in system browser:
    if(params.url.match(".pdf")){
      cordova.InAppBrowser.open(params.url, '_system');
    } else {
      // Default handling:
      callback(params.url);
    }
  },
}