Is it possible to redirect a POST request with Form-Data from a site to GitHub pages?

Question

JavaScript

The task is as follows:
1) There is a website https://mysite.com deployed on GitHum pages (the domain is bound in CName)
2) There is an application with a back-end on node.js https://api.mysite.com deployed on AWS С2
3) There is a certain "Resource", the API of which notifies my site about any events.
And here's the catch:
This "Resource" at https://mysite.com sends a GET or POST method request containing the information I need in form-data. But I need this request on the api.mysite.com endpoint, and subdomains like https://api.mysite.com are not accepted. If the site were "lying" on a regular hosting, I would catch a resource request at https://mysite.com/endpoint.phpand send it to the desired https://api.mysite.com/endpoint/ . But what about GitHub pages? Is it possible to make a redirect pointing to the resource https://mysite.com/redirect.html ?

Answer 1

I didn't quite understand the question, but maybe this will help you:

var original = {
  open: XMLHttpRequest.prototype.open,
  send: XMLHttpRequest.prototype.send
};

XMLHttpRequest.prototype.open = function (method, url, async, user, password) {
  console.log(url);
  return original.open.call(this, method, url, async, user, password);
};

XMLHttpRequest.prototype.send = function (data) {
  console.log(data);
  return original.send.call(this, data);
};

You can replace the XMLHttpRequest function with your own and intercept all outgoing POST / GET requests. If desired, intercepted requests can be canceled and redirected to another address, which seems to be what you need.