/getfile_action
this action tries to get a file with the given name if it finds it, it increases the request-counter of this file sets the appropriate mimetype and redirects the browser to the file

Sourcecode in Site/actions.js:
1:   function getfile_action() {
2:      var f = this.files.get(req.data.name);
3:      if (f) {
4:         f.requestcnt++;
5:         res.contentType = f.mimetype;
6:         res.redirect(f.getUrl());
7:      } else {
8:         res.message = getMessage("error.fileNotFound", req.data.name);
9:         res.redirect(this.href());
10:     }
11:     return;
12:  }