- Electron version: 1.3.5
- Operating system: macOS/Windows

Alt-clicking a link is a default shortcut for downloading a file without a save prompt, and we make use of it in our app. But for links that end in a trailing slash, the resulting filename isn't consistent with the default file name in the save prompt.

The save prompt constructs a name from the word "download" and the extension for the mime type of the file, but the prompt-less savepath is just the domain name of the link. This leads to unusable files (e.g. with a .com file extension) being saved to the filesystem.

Here's my current workaround, but given the prompt does get a useful path, and Chrome behaves correctly, I imagine this might be straightforward to fix if you know where to look:

``` javascript
const mime = require('mime-types');
const _ = require('lodash');
const path = require('path');
const unusedFilename = require('unused-filename');

win.webContents.session.on('will-download', function (e, item, webContents) {
  if (item.getSavePath() && _.last(item.getURL()) === '/') {
      var savePath = unusedFilename.sync(path.format({
        dir: path.dirname(item.getSavePath()),
        name: 'download',
        ext: '.' + mime.extension(item.getMimeType())
      }));
      item.setSavePath(savePath);
    }
});
```

atom/browser/api/atom_api_web_contents.cc
params.should_clear_history_list = true;
  params.override_user_agent = content::NavigationController::UA_OVERRIDE_TRUE;
  web_contents()->GetController().LoadURLWithParams(params);
  
  
  
  const auto view = web_contents()->GetRenderWidgetHostView();
  WebContentsPreferences* web_preferences =
      WebContentsPreferences::FromWebContents(web_contents());
  std::string color_name;
  if (web_preferences->web_preferences()->GetString(options::kBackgroundColor,
                                                    &color_name)) {
    view->SetBackgroundColor(ParseHexColor(color_name));
  } else {
    view->SetBackgroundColor(SK_ColorTRANSPARENT);
  }
  
  const auto host = static_cast<content::RenderWidgetHostImpl*>(
      view->GetRenderWidgetHost());
  host->disable_hidden_ = !background_throttling_;
}
void WebContents::DownloadURL(const GURL& url) {
  auto browser_context = web_contents()->GetBrowserContext();
  auto download_manager =
    content::BrowserContext::GetDownloadManager(browser_context);
  download_manager->DownloadUrl(
      content::DownloadUrlParameters::CreateForWebContentsMainFrame(
          web_contents(), url));
}
GURL WebContents::GetURL() const {