Ruby: How to post a file via HTTP as multipart/form-data?

I like RestClient. It encapsulates net/http with cool features like multipart form data:

require 'rest_client'
RestClient.post('http://localhost:3000/foo', 
  :name_of_file_param => File.new('/path/to/file'))

It also supports streaming.

gem install rest-client will get you started.

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