feat: response interceptor

[chimurai]

Add responseInterceptor handler to easily intercept and manipulate responses. Responses compressed with brotli, gzip and deflate are decompressed automatically.

install beta: npm install http-proxy-middleware@1.2.0-beta.2 or yarn add http-proxy-middleware@1.2.0-beta.2

• fixes [ Question ] How do you manipulate proxy response #97
• fixes Intercept and modify the response sent by the proxied server #469
• fixes Create modify-or-save-responses.md #355

TL;DR

const { createProxyMiddleware, responseInterceptor } = require('http-proxy-middleware');

const proxy = createProxyMiddleware({
  /**
   * IMPORTANT: avoid res.end being called automatically
   **/
  selfHandleResponse: true, // res.end() will be called internally by responseInterceptor()

  /**
   * Intercept response and replace 'Hello' with 'Goodbye'
   **/
  onProxyRes: responseInterceptor(async (responseBuffer, proxyRes, req, res) => {
    const response = responseBuffer.toString('utf-8'); // convert buffer to string
    return response.replace('Hello', 'Goodbye'); // manipulate response and return the result
  }),
});

documentation: https://github.com/chimurai/http-proxy-middleware/tree/response-interceptor#intercept-and-manipulate-responses

recipes: https://github.com/chimurai/http-proxy-middleware/blob/response-interceptor/recipes/response-interceptor.md#readme

[chimurai]

published in v1.2.0

[OriginalEXE]

Just wanted to say thank you for implementing this feature, you are awesome.