Async Thin web server app for testing timeouts

asink.rb

require 'rubygems'
require 'thin'

# curl "http://localhost:10001/?wait=5&status=500"
# ---
# wait - How many seconds should I wait before returning the status?
# status - HTTP return code

Thin::Server.start('127.0.0.1', 10001, Proc.new{|env|
  req = Rack::Request.new(env)
  puts "#{Time.now} - GET /?#{req.query_string}"
  EventMachine::Timer.new(req.params['wait'].to_i) {
    response = [(req.params['status'] || 200).to_i, {}, '']
    env['async.callback'].call response
  }
  # Tell thin to chill, we're gonna run this stack async-style
  [-1, {}, []]
})

I used this little app to test slow upstreams in a proxy server I had to implement.