nginx-luaGet user agent with Lua

server {
  location / {
    content_by_lua_block {
      ngx.say( ngx.var.http_user_agent);
    }
  }
}ctrl + cyoutubegithub

`content_by_lua_block` nginx-lua module directive to specify block of Lua code	`ngx.var` access request query string parameters
`ngx.say` output given text to client	`http_user_agent` returns user agent value

ngx.say( ngx.var.http_user_agent);

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36