[knot-resolver-users] Accessing DoH headers in Lua

Hi there, please, can anyone move me forward? I want to implement new stats counter for DoH requests with “Chrome” in "user-agent" header. I don’t know how to iterate “query.request.qsource.headers”. I have tried: function count_chrome_doh() return function (state, query) if query.request.qsource.flags.http then for k, v in ipairs(query.request.qsource.headers) do if v.name == 'user-agent' and v.value == 'Chrome' then if stats.get('request.agent.chrome') then stats['request.agent.chrome'] = stats.get('request.agent.chrome') + 1 else stats['request.agent.chrome'] = 1 end return nil end end end return nil end end policy.add(count_chrome_doh()) but it falls with error "'struct 322' has no '__ipairs’ metamethod” Thanks! Blažej