title: Enforce file upload size on Heroku?
body: <p>Got a Rails app on Heroku.  I want to limit the size of a file upload if possible.  The file is processed as a StringIO object, so the file contents will be processed in memory (have no need to write an intermediate file to a filesystem).</p>
  
  <p>Ordinarily, I would limit upload size on the web server.  But with Heroku, what options are there?  I realize I could go with a Flash uploader, but I'm hoping to avoid requiring Flash on the client, if at all possible.</p>