ProxyAgent can not work with Pool request

[suil]

Bug Description

  const pool = new Pool(url);
  const proxyAgent = new ProxyAgent("http://one-proxy:8080");
  const { statusCode, body } = await pool.request({
    ...
    dispatcher: proxyAgent,
    ...
  ...});

when Pool is used, it's not picking up { ..., dispatcher: new ProxyAgent("...")}, nor setGlobalDispatcher(proxyAgent).

However, request is used, ProxyAgent works.

my code is behind the proxy. also Pool is the one I will need to use.

Reproducible By

Expected Behavior

Logs & Screenshots

{
  error: Error: getaddrinfo ENOTFOUND eth-testnet-communities-152b99c6597fb22e.elb.us-west-2.amazonaws.com
      at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:71:26)
      at GetAddrInfoReqWrap.callbackTrampoline (node:internal/async_hooks:130:17) {
    errno: -3008,
    code: 'ENOTFOUND',
    syscall: 'getaddrinfo',
    hostname: 'eth-testnet-communities-152b99c6597fb22e.elb.us-west-2.amazonaws.com'
  }
}

Environment

Node v16.14.0

Additional context

[mcollina]

This is expected but we likely are not throwing a descriptive error.

[ronag]

Should we throw an error if dispatcher is passed somewhere where it is not expected?

[mcollina]

I think so.

[suil]

why is this expected? so pool is not suppose to use proxy?

[mcollina]

Pool is a group of connections to a single client. A proxy (by its definition) allows to connect to all hosts. You should just use the proxy directly.

[suil]

thanks! any example of using proxy directly?

[mcollina]

Isn't https://github.com/nodejs/undici/blob/main/examples/proxy-agent.js enough? I think you can also call proxyAgent.request().

[umakanth-fmr]

Hardhat plugin uses undici with Pool and has the same problem. It does not work behind corporate proxy.