app.lua

local socket = require("socket")

local host = "127.0.0.1"
local port = 9000

local server = assert(socket.bind(host, port))
print("Lua HTTP server listening on " .. host .. ":" .. port)

while true do
  local client = server:accept()
  client:settimeout(1)

  -- Read the request (we ignore details and always respond with Hello World)
  local request = client:receive("*l")
  -- Consume the rest of the HTTP headers
  while true do
    local line, err = client:receive("*l")
    if not line or line == "" then
      break
    end
  end

  local body = "Hello World from Lua! Yousef"
  local response = "HTTP/1.1 200 OK\r\n" ..
                   "Content-Type: text/plain\r\n" ..
                   "Content-Length: " .. #body .. "\r\n" ..
                   "Connection: close\r\n" ..
                   "\r\n" ..
                   body

  client:send(response)
  client:close()
end