# Passing a block to Rack::Response#finish<\/span>\n#<\/span>\n# You can pass a block to #write, which yields self;<\/span>\n# calls to #write inside the block will write directly to the<\/span>\n# output stream instead of Rack::Response's internal buffer<\/span>\nclass<\/span> App<\/span>\n  def<\/span> call<\/span>(<\/span>env<\/span>)<\/span>\n    Rack<\/span>::<\/span>Response<\/span>.<\/span>new<\/span>.<\/span>finish<\/span> do<\/span> |<\/span>resp<\/span>|<\/span>\n      resp<\/span>.<\/span>write<\/span> "one<\/span>\\n<\/span>"<\/span>\n      sleep<\/span> 1<\/span>\n      resp<\/span>.<\/span>write<\/span> "two<\/span>\\n<\/span>"<\/span>\n      sleep<\/span> 1<\/span>\n      resp<\/span>.<\/span>write<\/span> "three<\/span>\\n<\/span>"<\/span>\n    end<\/span>\n  end<\/span>\nend<\/span>\n\nrun<\/span> App<\/span>.<\/span>new<\/span>\n\n# Run with "rackup" command; use curl to connect:<\/span>\n#<\/span>\n#   > curl localhost:9292<\/span>\n#   one<\/span>\n#   two<\/span>\n#   three<\/span>\n<\/pre><\/div>\n