How to set up for Caddyfile?

[VesperQuartz]

I am trying to set this up to autoformat my Caddyfile, but when I save I get the error "WARNING: The file has been changed since reading it!!!"

This is my config

require("conform").setup({
  formatters_by_ft = {
  caddyfile = { "caddyfile" },
 },
  formatters = {
      caddyfile = {
        command = "caddy",
        args = { "fmt", "--overwrite" },
        stdin = true,
        cwd = require("conform.util").root_file({ "Caddyfile" }),
        require_cwd = true,
      }
  }
})

[VesperQuartz]

fixed with changing
args = { "fmt", "--overwrite" }, which does not print to stdout
to
args = { "fmt"}, prints to stdout

[wangweixuan]

The - argument can be used to tell caddy to read from stdin and avoid depending on cwd:

{
  command = "caddy",
  args = { "fmt", "-" },
  stdin = true,
}