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.

Happy uploading!

References

• Rails Ticket #2497: Rack in Rails 2.3.2 throws fatal error with small uploads
• Rack commit log: Fix multipart uploads on 1.9
• Ruby NYC: paperclip triggering a “invalid byte sequence in US-ASCII” ruby 1.9 rails 2.3

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