[Javascript] How can I intercept the response globally?

Description

I want to register a global interceptor to handle the response. We have customized error code that will be returned as a Http 200 successful response.
I have checked the source code I found there is a line of code: this.requestAgent = null;.
Then I did below

let Agent = require('superagent');
let agent = new Agent().use((reqequest) => {
  console.log(request);
  request.on('response', function(response) {
    console.log(response.mydata.responseCode);
    return request;
  })
});
const myService= require('@myService');
myService.ApiClient.instance.requestAgent = agent;

I can see the reqequest from the console, means it got called. but never get the response. If I add .end it calls the API, However, the URL is ttp://localhost:8080/undefined.

I think I didn't do it correctly. Can any one show me an example to how to intercept the response??

I don't want to repeat my code to add those checks in each API's callback...

Swagger-codegen version

2.3.1

Swagger declaration file content or url

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

Start at myService.ApiClient.instance.requestAgent and the superagent .use() response handler, then reproduce the undefined URL and missing response with the generated JavaScript client. Done means the supported global response-interception behavior is identified and demonstrated without breaking the request URL.