install lua & luarocks

yum install make gcc readline-devel

lua

curl -R -O http://www.lua.org/ftp/lua-5.4.3.tar.gz
tar zxf lua-5.4.3.tar.gz
cd lua-5.4.3
make all test
make linux install
ln -s /usr/local/bin/lua /usr/bin/lua

luarocks

wget https://luarocks.org/releases/luarocks-3.7.0.tar.gz
tar zxpf luarocks-3.7.0.tar.gz
cd luarocks-3.7.0
./configure && make && sudo make install
sudo luarocks install luasocket

on rpi

sudo apt install lua-socket luarocks
wget http://download.savannah.gnu.org/releases/lzip/lzlib/lzlib-1.12.tar.gz
tar -xf lzlib-1.12.tar.gz
cd lzlib-1.12
./configure && make all check
make install
make install-bin install-man
luarocks install pegasus

http://evandrolg.github.io/pegasus.lua/

#!/usr/bin/lua
local pegasus = require "pegasus"

local server = pegasus:new({
  port='9090',
  location='example/root'
})

local printTable = function(table)
  for k, v in pairs(table) do
    print(k, '=', v)
  end
end

server:start(function (request, response)
  local method = request:method()
  local data = request:post()
  if data then
    printTable(data)
  end
  if method == "GET" then
    response:write("hi")
  end
  if method == "POST" then
    response:write("api")
  end
end)