sendcompressed.lua

-- little helper function
function file_exists(path)
  local attr = lighty.stat(path)
  if (attr) then
      return true
  else
      return false
  end
end

-- the magic ;)
local original_attr = lighty.stat(lighty.env["physical.path"])
if (original_attr) then 
  if (lighty.request["Accept-Encoding"]) then
    if (lighty.request["Accept-Encoding"] ~= "gzip") then
      local original_content_type = original_attr["content-type"]
      local compressed_file = lighty.env["physical.path"] .. ".gz"
      if (file_exists(compressed_file)) then
        lighty.env["physical.path"] = compressed_file
        lighty.header["Content-Encoding"] = "gzip"
        lighty.header["Content-Type"] = original_content_type
      end
    end
  end
end
-- fallthrough will put it back into the lighty request loop
-- that means we get the 304 handling for free. ;)

thank you :)

lighty config snippet

magnet.attract-physical-path-to = ( conf_dir + "/sendcompressed.lua" )

awesome..