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Simple TCPSocket server in Ruby exhibits a HTTP header issue

I'm benchmarking some simple HTTP server implementations in Ruby (no threads, threaded, fibers and eventmachine) but this simple piece of code fails using threads:

#!/usr/bin/env ruby

require 'socket'

server = TCPServer.new("127.0.0.1", 8080)
puts "Listening on 127.0.0.1:8080"
while true
  Thread.new(server.accept) do |client|
    msg = client.readline
    headers = [
      "",
      "HTTP/1.1 200 OK",
      "Date: Fri, 30 Sep 2011 08:11:27 GMT",
      "Server: TCP socket test",
      "Content-Type: text/html; charset=iso-8859-1",
      "Content-Len开发者_开发问答gth: #{msg.length}\r\n\r\n"].join("\r\n")

    client.write headers
    client.write ">>> Data sent:\n #{msg}"
    client.close
  end
end

A simple curl http://localhost:8080/ works fine, when the first element in the array is "" or other String, but not the "HTTP/1.1 200 OK" response directly. Why is this?

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