Fixing Multipart Uploads in Rack for Ruby 1.9
There is a slight problem in Rack 1.0.0 that causes a fatal error to be produced when uploading files <= 110K in size. You may need to patch Rack if you see the following error when uploading a file (I saw it with Paperclip):
Here's what you do to patch Rack:
You should now be back in business. Hopefully it won't be too long before an update is released for Rack that includes the patch.