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run ->e{[418,{},[]]}
Must be saved as config.ru, and run with the rackup command.
config.ru
rackup
Or if you prefer "pure" Ruby:
Rack::Handler::WEBrick.run ->e{[418,{},[]]}
4342 bytes + -rrack flag = 4948 bytes
-rrack
43 bytes + -rrack flag = 49 bytes
run->e{[418,{},[]]}
Rack::Handler::WEBrick.run->e{[418,{},[]]}
42 bytes + -rrack flag = 48 bytes