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🇨🇳 Frank Xu (阿阳)

我是 Frank Xu (阿阳)，生活在广州，工作在腾讯。曾在 淘宝 带过前端，在 QQ邮箱 带过客户端。现在负责 微信读书 的数据运营，用数据驱动增长，用算法驱动内容分发。

技术栈比较泛，享受工程创造价值的过程。偶尔也在这里记录一些 零星的思考。

2022 开启一段新的旅程，尝试去带一个小产品，叫 微信听书，践行自己的产品观，知难行更难。

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h2dns's Issues

dependencies

npm install request spdy dnsd

installing depend as package.js http2": "^3.3.6 didnt solve. it keeps asking for spdy.


`PS C:\app\dns-over-http2-master> node.exe .\index.js
module.js:457
    throw err;
    ^

Error: Cannot find module 'dnsd'
    at Function.Module._resolveFilename (module.js:455:15)
    at Function.Module._load (module.js:403:25)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (C:\app\dns-over-http2-master\index.js:1:76)
    at Module._compile (module.js:556:32)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
PS C:\app\dns-over-http2-master> npm install dnsd
[email protected] C:\app\dns-over-http2-master
`-- [email protected]
  +-- [email protected]
  `-- [email protected]
    `-- [email protected]

PS C:\app\dns-over-http2-master> node.exe .\index.js
module.js:457
    throw err;
    ^

Error: Cannot find module 'spdy'
    at Function.Module._resolveFilename (module.js:455:15)
    at Function.Module._load (module.js:403:25)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (C:\app\dns-over-http2-master\index.js:2:14)
    at Module._compile (module.js:556:32)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
PS C:\app\dns-over-http2-master> npm install http2
[email protected] C:\app\dns-over-http2-master
`-- [email protected]

PS C:\app\dns-over-http2-master> node.exe .\index.js
module.js:457
    throw err;
    ^

Error: Cannot find module 'spdy'
    at Function.Module._resolveFilename (module.js:455:15)
    at Function.Module._load (module.js:403:25)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (C:\app\dns-over-http2-master\index.js:2:14)
    at Module._compile (module.js:556:32)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
PS C:\app\dns-over-http2-master> npm install spdy
[email protected] C:\app\dns-over-http2-master
`-- [email protected]
  +-- [email protected]
  | `-- [email protected]
  +-- [email protected]
  +-- [email protected]
  +-- [email protected]
  `-- [email protected]
    +-- [email protected]
    | `-- [email protected]
    +-- [email protected]
    +-- [email protected]
    | +-- [email protected]
    | +-- [email protected]
    | +-- [email protected]
    | +-- [email protected]
    | +-- [email protected]
    | `-- [email protected]
    `-- [email protected]
      `-- [email protected]

PS C:\app\dns-over-http2-master> node.exe .\index.js
module.js:457
    throw err;
    ^

Error: Cannot find module 'request'
    at Function.Module._resolveFilename (module.js:455:15)
    at Function.Module._load (module.js:403:25)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (C:\app\dns-over-http2-master\index.js:3:36)
    at Module._compile (module.js:556:32)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
PS C:\app\dns-over-http2-master> npm install request
[email protected] C:\app\dns-over-http2-master
`-- [email protected]
  +-- [email protected]
  +-- [email protected]
  +-- [email protected]
  | `-- [email protected]
  +-- [email protected]
  +-- [email protected]
  | `-- [email protected]
  +-- [email protected]
  +-- [email protected]
  +-- [email protected]
  | `-- [email protected]
  +-- [email protected]
  | +-- [email protected]
  | | +-- [email protected]
  | | +-- [email protected]
  | | +-- [email protected]
  | | | `-- [email protected]
  | | +-- [email protected]
  | | `-- [email protected]
  | +-- [email protected]
  | | `-- [email protected]
  | +-- [email protected]
  | | +-- [email protected]
  | | +-- [email protected]
  | | | `-- [email protected]
  | | +-- [email protected]
  | | `-- [email protected]
  | `-- [email protected]
  |   `-- [email protected]
  +-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | `-- [email protected]
  +-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | | +-- [email protected]
  | | +-- [email protected]
  | | `-- [email protected]
  | `-- [email protected]
  |   +-- [email protected]
  |   +-- [email protected]
  |   +-- [email protected]
  |   +-- [email protected]
  |   | `-- [email protected]
  |   +-- [email protected]
  |   +-- [email protected]
  |   | `-- [email protected]
  |   +-- [email protected]
  |   +-- [email protected]
  |   `-- [email protected]
  +-- [email protected]
  +-- [email protected]
  +-- [email protected]
  +-- [email protected]
  | `-- [email protected]
  +-- [email protected]
  +-- [email protected]
  +-- [email protected]
  +-- [email protected]
  +-- [email protected]
  `-- [email protected]

PS C:\app\dns-over-http2-master> node.exe .\index.js
{ Error: bind EACCES 127.0.0.1:5353
    at Object.exports._errnoException (util.js:1036:11)
    at exports._exceptionWithHostPort (util.js:1059:20)
    at dgram.js:221:18
    at _combinedTickCallback (internal/process/next_tick.js:77:11)
    at process._tickCallback (internal/process/next_tick.js:98:9)
    at Module.runMain (module.js:592:11)
    at run (bootstrap_node.js:394:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:509:3
  code: 'EACCES',
  errno: 'EACCES',
  syscall: 'bind',
  address: '127.0.0.1',
  port: 5353 }
events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: getaddrinfo EAI_AGAIN dns.google.com:443
    at Object.exports._errnoException (util.js:1036:11)
    at errnoException (dns.js:33:15)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:76:26)

[BUG] Crash On Connection Close

i receive this error sometimes:


events.js:182
      throw er; // Unhandled 'error' event
      ^

Error: This socket has been ended by the other party
    at Socket.writeAfterFIN [as write] (net.js:355:12)
    at Socket.Writable.end (_stream_writable.js:528:10)
    at Socket.end (net.js:490:31)
    at Response.end (C:\Users\root\AppData\Roaming\npm\node_modules\h2dns\dnsd\server.js:238:21)
    at Request.request [as _callback] (C:\Users\root\AppData\Roaming\npm\node_modules\h2dns\h2dns:162:11)
    at self.callback (C:\Users\root\AppData\Roaming\npm\node_modules\h2dns\node_modules\request\request.js:188:22)
    at emitOne (events.js:120:20)
    at Request.emit (events.js:210:7)
    at ClientRequest.<anonymous> (C:\Users\root\AppData\Roaming\npm\node_modules\h2dns\node_modules\request\request.js:8
22:16)
    at Object.onceWrapper (events.js:312:19)

chicken and egg Problem for forwardurl resolve while h2dns (forwarder) used As System resolver

it tries to resolve dns.google.com and fails, because it can't itself As it is a forwarder only.

suggested solution step:

  1. Put a hardcoded fallback IP for both ipv6 and Internet Protocol Version 4, bad because it is Not anycasted like 8.8.8.8. should be used for very earliest first Connection Agent only If No other Connection could be made. because you Want the nearset dns.google.com Server near you for latency reasons.
  2. while we ping it already, use the result! Cache at least the Response of dns.google.com between restarts.
  3. use fallback only, if No previous Cached ip is PresenIP

for spdy, comman Name is required for certificate Validation. simply use Ip only As Host Not work here As wanted.

On timeout Response answer is empty

if timeout occurs, for whatever reason.
Response code is noerror with empty answer.
make dns asking Application understand

Response received from 127.0.0.1:
Answer section:
No A-Records found for github.com

because res.end(); is still called After if (output && output.Answer) {}

can there be added something like
.on('timeout', RETRY Request?
than respond with res.end(); inside end of "if (output && output.Answer) {}"

Response Parsing TXT Queries correctly.

escaping issues?

there shouldn't be that "\ Look and notice the difference compared in directly and dns-overhttp resolver:

; <<>> DiG 9.9.5-3ubuntu0.8-Ubuntu <<>> @8.8.8.8 TXT google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30417
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;google.com.                    IN      TXT

;; ANSWER SECTION:
google.com.             3599    IN      TXT     "v=spf1 include:_spf.google.com ~all"



; <<>> DiG 9.9.5-3ubuntu0.8-Ubuntu <<>> @127.0.0.1 -p 6666 TXT google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44263
;; flags: qr rd ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;google.com.                    IN      TXT

;; ANSWER SECTION:
google.com.             3600    IN      TXT     "\"v=spf1 include:_spf.google.com ~all\""

Unhandled stream error in pipe. Timeout._onTimeout

nice To see this agentpool. If Connection is good stable, it keeps creating a new Agent just Fine As I watched it now. Makes it more reliable over long time use. Well here is first errors i could reproduce.
Perhaps assume Agent To be faulty if ETIMEDOUT or check agent state before sending request, create new agent when agent Connection Lost.
Issue:
But with Default Setting, if tcp Connection closed two times. timeout kills it.
Note i closed the last Agent Connection i was seeing by Network in tcp manually. Two times each running.

[1477335892459/192/udp4] query dns.google.com IN AAAA: 213.177ms
Exceed pool maxSockets, creating a new Agent
Exceed pool maxSockets, creating a new Agent
[1477335904639/194/udp4] query dns.google.com IN AAAA: 775.732ms
[1477335901508/193/udp4] query dns.google.com IN AAAA: 5002.269ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477335914973/196/udp4] query dns.google.com IN AAAA: 180.633ms
[1477335911100/195/udp4] query dns.google.com IN AAAA: 5017.017ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477335915968/197/udp4] query dns.google.com IN AAAA: 634.341ms
[1477335917612/198/udp4] query dns.google.com IN AAAA: 153.931ms
[1477335918963/199/udp4] query dns.google.com IN AAAA: 144.956ms
[1477335919323/200/udp4] query dns.google.com IN AAAA: 174.744ms
[1477335919600/201/udp4] query dns.google.com IN AAAA: 413.346ms
[1477335920092/202/udp4] query dns.google.com IN AAAA: 188.164ms
[1477335920371/203/udp4] query dns.google.com IN AAAA: 301.873ms
[1477335920907/204/udp4] query dns.google.com IN AAAA: 224.692ms
[1477335921415/205/udp4] query dns.google.com IN AAAA: 577.275ms
[1477335922194/206/udp4] query dns.google.com IN AAAA: 196.912ms
[1477335922499/207/udp4] query dns.google.com IN AAAA: 253.411ms
[1477335922938/208/udp4] query dns.google.com IN AAAA: 225.621ms
[1477335923415/209/udp4] query dns.google.com IN AAAA: 186.591ms
[1477335927859/210/udp4] query dns.google.com IN AAAA: 5001.364ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477335935337/211/udp4] query dns.google.com IN AAAA: 5001.259ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477335941060/212/udp4] query dns.google.com IN AAAA: 5000.766ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477335947215/213/udp4] query dns.google.com IN AAAA: 5001.534ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477335953088/214/udp4] query dns.google.com IN AAAA: 5001.386ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477335959788/215/udp4] query dns.google.com IN AAAA: 5002.692ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
stream.js:74
      throw er; // Unhandled stream error in pipe.
      ^

Error: ETIMEDOUT
    at Timeout._onTimeout (C:\app\yyfrankyy\node_modules\request\request.js:759:15)
    at ontimeout (timers.js:365:14)
    at tryOnTimeout (timers.js:237:5)
    at Timer.listOnTimeout (timers.js:207:5)
PS C:\app\yyfrankyy> node .\dns-over-http2\index.js
Exceed pool maxSockets, creating a new Agent
[1477336033348/217/udp4] query dns.google.com IN AAAA: 1201.679ms
[1477336035917/218/udp4] query dns.google.com IN AAAA: 119.984ms
[1477336037250/219/udp4] query dns.google.com IN AAAA: 264.863ms
[1477336038089/220/udp4] query dns.google.com IN AAAA: 172.062ms
[1477336038696/221/udp4] query dns.google.com IN AAAA: 222.884ms
[1477336039202/222/udp4] query dns.google.com IN AAAA: 187.021ms
[1477336039736/223/udp4] query dns.google.com IN AAAA: 141.968ms
[1477336040189/224/udp4] query dns.google.com IN AAAA: 286.275ms
[1477336040639/225/udp4] query dns.google.com IN AAAA: 175.310ms
[1477336041169/226/udp4] query dns.google.com IN AAAA: 219.336ms
[1477336041636/227/udp4] query dns.google.com IN AAAA: 218.828ms
[1477336042116/228/udp4] query dns.google.com IN AAAA: 266.861ms
[1477336044618/229/udp4] query dns.google.com IN AAAA: 252.162ms
[1477336045089/230/udp4] query dns.google.com IN AAAA: 222.127ms
[1477336045581/231/udp4] query dns.google.com IN AAAA: 150.765ms
[1477336047578/232/udp4] query dns.google.com IN AAAA: 383.554ms
[1477336048700/233/udp4] query dns.google.com IN AAAA: 405.680ms
Exceed pool maxSockets, creating a new Agent
[1477336059013/235/udp4] query dns.google.com IN AAAA: 1377.028ms
[1477336056528/234/udp4] query dns.google.com IN AAAA: 5002.261ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477336062387/236/udp4] query dns.google.com IN AAAA: 5001.224ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477336068536/237/udp4] query dns.google.com IN AAAA: 5000.370ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477336075330/238/udp4] query dns.google.com IN AAAA: 5001.855ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477336084832/239/udp4] query dns.google.com IN A: 5001.703ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477336091574/240/udp4] query dns.google.com IN A: 160.410ms
[1477336093342/241/udp4] query dns.google.com IN A: 303.905ms
stream.js:74
      throw er; // Unhandled stream error in pipe.
      ^

Error: ETIMEDOUT
    at Timeout._onTimeout (C:\app\yyfrankyy\node_modules\request\request.js:759:15)
    at ontimeout (timers.js:365:14)
    at tryOnTimeout (timers.js:237:5)
    at Timer.listOnTimeout (timers.js:207:5)
PS C:\app\yyfrankyy> node .\dns-over-http2\index.js
Exceed pool maxSockets, creating a new Agent
[1477336168206/242/udp4] query dns.google.com IN A: 1175.152ms
[1477336171339/243/udp4] query dns.google.com IN A: 151.063ms
[1477336172470/244/udp4] query dns.google.com IN A: 142.233ms
[1477336173431/245/udp4] query dns.google.com IN A: 171.075ms
[1477336174352/246/udp4] query dns.google.com IN A: 106.235ms
[1477336175248/247/udp4] query dns.google.com IN A: 145.000ms
Exceed pool maxSockets, creating a new Agent
[1477336239210/248/udp4] query dns.google.com IN A: 1125.833ms
Exceed pool maxSockets, creating a new Agent
[1477336251853/249/udp4] query dns.google.com IN A: 776.282ms
[1477336276844/252/udp4] query dns.google.com IN A: 132.581ms
[1477336280599/253/udp4] query dns.google.com IN A: 134.638ms
[1477336281288/254/udp4] query dns.google.com IN A: 116.424ms
[1477336290051/255/udp4] query dns.google.com IN A: 5002.527ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
stream.js:74
      throw er; // Unhandled stream error in pipe.
      ^

Error: ETIMEDOUT
    at Timeout._onTimeout (C:\app\yyfrankyy\node_modules\request\request.js:759:15)
    at ontimeout (timers.js:365:14)
    at tryOnTimeout (timers.js:237:5)
    at Timer.listOnTimeout (timers.js:207:5)
PS C:\app\yyfrankyy> node .\dns-over-http2\index.js
Exceed pool maxSockets, creating a new Agent
[1477336368713/23041/udp4] query dns.google.com IN A: 960.108ms
[1477336372574/279/udp4] query dns.google.com IN A: 132.970ms
[1477336376407/54035/udp4] query dns.google.com IN A: 121.612ms
[1477336379548/13914/udp4] query dns.google.com IN A: 159.797ms
[1477336380345/13784/udp4] query dns.google.com IN A: 112.050ms
[1477336382409/20190/udp4] query dns.google.com IN A: 129.664ms
Exceed pool maxSockets, creating a new Agent
[1477336387686/54992/udp4] query dns.google.com IN A: 5003.602ms
request error Error: ETIMEDOUT
request error Error: ETIMEDOUT
[1477336392686/54992/udp4] query dns.google.com IN A: 615.964ms
[1477336414340/33003/udp4] query dns.google.com IN A: 200.432ms
[1477336416037/38704/udp4] query dns.google.com IN A: 118.119ms
[1477336416917/570/udp4] query dns.google.com IN A: 180.957ms
[1477336418621/2658/udp4] query dns.google.com IN A: 158.877ms
stream.js:74
      throw er; // Unhandled stream error in pipe.
      ^

Error: ETIMEDOUT
    at Timeout._onTimeout (C:\app\yyfrankyy\node_modules\request\request.js:759:15)
    at ontimeout (timers.js:365:14)
    at tryOnTimeout (timers.js:237:5)
    at Timer.listOnTimeout (timers.js:207:5)

If this Thing can be fixed. dns-over-http2 would become very reliable resolver now. Even Running On Laptop On Public Hotspots or Mobil Internet.

argv

how you set port and IP if subnet shall be empty? Because subnet is first Argument and if it is „empty“ port is interpreted As subnet And IP As port?
i don't get it. If i use with defaults Index.js its Fine. But if i Want Run subnet empty and port 53 i can't ?
How about changing this behaivior To something like -e "0.0.0.0/0" -p 53 -a 127.0.0.1 for example… for future config param like padding or additional resolver when first come

BIND UDPv6 fail while TCP6 works

i cannot Start On localhost binding IPv6 ::1

node .\index.js 0..0.0.0 6666 ::1
dnsd error: Error: bind EINVAL ::1:6666

this error i get since first Version. lookups over tcp6 Are Okay. But it does Not bind udp port when IPv6 address specified.
Nodev6.8.0

[BUG] accidential Distributed Denial of Service-Attack

h2dns 1.0.6 does Not respect configured "-c, --pool [2] Concurrent Connections of Pool Size“

with Default or even set to 1,
it opens up to tousands of connections to forwardurl

without know howto dPool correctly, i guess it happens somewhere in state of retry to resolve on timeout and spawning New Connection into pool

ECONNRESET cause crash 

{ Error: socket hang up
    at TLSSocket.onHangUp (_tls_wrap.js:1092:19)
    at TLSSocket.g (events.js:291:16)
    at emitNone (events.js:91:20)
    at TLSSocket.emit (events.js:185:7)
    at endReadableNT (_stream_readable.js:974:12)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickDomainCallback (internal/process/next_tick.js:122:9) code: 'ECONNRESET' }

AgentPool

running 0a851be i see 11 idle connections keep-alive to dns.google.com and for EVERY single query spawning a new connection and closing it after query answered.
spdy 3.4.4
nodejs 6.9.1

request "ping" does Not use Pool, spawning New Agent every interval

every Minute you see
Exceed pool maxSockets, creating a new Agent
this happens because the pinginterver

`setInterval(() => {
  let ping = forwardUrl + '?name=' + resolver.hostname;
  request(ping).pipe(devnull());
}, 60 * 1000);`

codepart

i fixed it with following:

setInterval(() => {     
      const http2Req = request({
            url: forwardUrl,
            qs: {
                name: resolver.hostname
                }
          }, (err, response, output) => {
            agentPool.release(http2Req.agent)
              })//.pipe(devnull());
}, 60 * 1000);

needed comment Out Pipe because

``
 { agent: undefined }
.\yyfrankyy\dns-over-http2\index.js:39
      if (tail.agent._spdyState.connection._spdyState.goaway) {
                    ^

TypeError: Cannot read property '_spdyState' of undefined
``

should we still use Pipe here, how?

On Start the first query is slow because delay of Agent Connection waiting created, so do it After init instantly To be ready. I removed Start delay with this:

const ping = function(){
    const http2Req = request({
        url: forwardUrl,
        qs: {
            name: resolver.hostname
            }
      }, (err, response, output) => {
        agentPool.release(http2Req.agent)
          })//.pipe(devnull());
    }
    setInterval(function(){
        ping()
    }, 60 * 1000)
    ping()

Run once started and every Minute As used To before. Opens a ready To use Agent directly. Check Benefit by Compare Response Milliseconds of first query ;-)

[BUG] Crash On TCP Connection Reset

If the DNS Client TCP Connection is Reset for any reason After query, h2dns 1.0.6 quits with:
``events.js:182
throw er; // Unhandled 'error' event
^

Error: read ECONNRESET
at exports._errnoException (util.js:1026:11)
at TCP.onread (net.js:607:25)
``

node v8.0.0

cannot set timeout argv

node .\h2dns -t 5000
node .\h2dns --timeout 5000


TypeError: "msecs" argument must be a number
    at Object.exports.enroll (timers.js:298:11)
    at Socket.setTimeout (net.js:330:12)
    at ClientRequest.<anonymous> (_http_client.js:642:10)
    at emitOne (events.js:101:20)
    at ClientRequest.emit (events.js:188:7)
    at tickOnSocket (_http_client.js:567:7)
    at onSocketNT (_http_client.js:579:5)
---------------------------------------------
    at ClientRequest.setTimeout (_http_client.js:641:8)
    at Request.start (C:\app\yyfrankyy\node_modules\request\request.js:773:16)
    at Request.end (C:\app\yyfrankyy\node_modules\request\request.js:1398:10)
    at end (C:\app\yyfrankyy\node_modules\request\request.js:567:14)
    at Immediate.<anonymous> (C:\app\yyfrankyy\node_modules\request\request.js:581:7)
    at runCallback (timers.js:637:20)
    at tryOnImmediate (timers.js:610:5)
    at processImmediate [as _immediateCallback] (timers.js:582:5)

parseInt?

res.recursion_available = false

google sets it "RA": true, // Always true for Google Public DNS
But dnsd false overwrites
https://github.com/yyfrankyy/dns-over-http2/edit/master/dnsd/convenient.js#l42
can be configured with
https://github.com/yyfrankyy/dns-over-http2/edit/master/dnsd/README.md#l244
i get typeerror .defaults is not a function :-(
please can set somehow dnsd.defaults({convenient: false})
changing https://github.com/yyfrankyy/dns-over-http2/edit/master/dnsd/convenient.js#l42 To true also works..

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