I am looking to monitor all outgoing HXR requests on the page in order to intercept a specific one that I wish to extract its data to log.

Here's the specific request I am trying to intercept:

Request header from the console

Request body I want to extract

Here's what I tried so far:

(function(send) {
XMLHttpRequest.prototype.send = function(body) {
    var info="send data\r\n"+body;
    console.log(info);
    send.call(this, body);
};
})(XMLHttpRequest.prototype.send);

This seems to be somehow working because I get some requests logged in the console but not the ones I am looking for. I also get some send data [object FormData] logged.

I am probably missing something about which HXR requests I am intercepting with my script and would love some help! Thanks for your time!