@chinesedfan, I don't really have a suggestion, but I also need #2233 (or an alternative to set the local address).

What about having something like beforeSend and transportOptions to avoid creating new and different options for each library?

Something like this usage:

/**
 * @param {import("http").ClientRequest | XMLHttpRequest} req 
 */
let beforeSend = (req) => {
  if (req instanceof XMLHttpRequest) {
    req.setRequestHeader("foo", "bar");
    req.onprogress = () => {
      // ... I know about axios has onUploadProgress but this is just an
      // example of how it can be used
    };
  } else {
    req.setNoDelay(true);
    req.setHeader("foo", "bar");
  }
};

/**
 * @type {import("http").RequestOptions}
 */
let transportOptions = {
  localAddress: "127.0.0.1",
};

let instance = axios.create({
  // ...
  beforeSend,
  transportOptions, // Node only
});

beforeSend will be called before these lines:

Since transportOptions can only be applied on Node side, it can be destructed in here

Wdyt @chinesedfan?

@seahindeniz Yes, you shared most of idea with me. Maybe we can learn something from other libraries first, like got or request. It's not easy to design an ideal solution.

so right now we can't use localAddress with axios ? o.o

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As a workaround for options, waiting for #2808 to be implemented you may do something like :

  const wrappedHttp = {
    ...http,
    request: (options, callback) => http.request({
      ...options,
      localAddress: 'some.ip.add.ress',
    }, callback),
  };

  const instance = axios.create({
    transport: wrappedHttp,
  });

@Poyoman39 Poyoman39 I have tried your sample code to set up the localAddress but it does not work.
I have tried 'eth1' or private ip for the localAddress field.

@Poyoman39 Sorry I forgot this feature is not launched yet.

@carlchan1994 my sample should work with an IP. I tried it on a local server, and it seemed to work well. Be sure your outbound IP address is available => ip addr
Also be sure to use http or https based on what type of request you make

@Poyoman39 I tried again and success this time. Thanks a lot. Here is my code:

const axios = require('axios').default
const http = require('http')

function create_axios(ip){
  const wrappedHttp = {
    ...http,
    request: (options, callback) => http.request({
      ...options,
      localAddress: ip,
    }, callback),
  }

  return axios.create({
    transport: wrappedHttp,
  })
}

const eth0 = create_axios('10.180.60.82')
const eth1 = create_axios('10.180.60.83')
const eth2 = create_axios('10.180.60.84')
const eth3 = create_axios('10.180.60.85')

eth0.get('https://ifconfig.co/ip').then(res => { console.info(res.data) })
eth1.get('https://ifconfig.co/ip').then(res => { console.info(res.data) })
eth2.get('https://ifconfig.co/ip').then(res => { console.info(res.data) })
eth3.get('https://ifconfig.co/ip').then(res => { console.info(res.data) })