Navigator.sendBeacon | Polyfill for Navigator.sendBeacon | Audio Utils library

I have to detect closing browser event so I close the user's connection. I have tried the following method:

I have to make a synchronous ajax request in beforeunload event, but it is throwing an error as synchronous ajax request are not supported in chromium browsers during page unload events.

What could be the alternative to make a synchronous ajax request during page unload event cycle.

I got cart products at my eCommerce website that I built with Angular,NodeJS,MongoDB. When my client wants to add quantity or decrease quantity of product for example from 4 to 2, it will send 2 patch requests to update the quantity (first one from 4 to 3 and second from 3 to 2), I want it to make a way better algorithm that will do in 1 request (for example at the end of the session, when the user is leaving the website, etc..) I tried using Navigator.sendBeacon and it sometimes works and sometimes not (which I can't use, I need something that works all the time..) I don't want to show the user any message before he leaves which I know that make the fix for that issue and it will work with navigator.sendBeacon Here is what I made with navigator.sendBeacon :

Client Side:

I need to send some data to the server when the page is closed or refreshed. Therefore, I created a simple script that can handle my needs. The problem is that this script is not working in Mozilla firefox.

The script is working in many other browsers like chrome, chromium, brave, opera, falkon, epiphany, qutebroser, Midori, safari, edge. The problem is only with firefox.

I have an old greasemonkey script that used to start refreshing pages on new tab:

I am trying to get the content / body from a text/plain POST request in a Controller in Laravel 8.

Nothing in the docs or numerous google searches worked.

I am trying to send a POST request on visibility change (as described in the docs) and am having limited success. I make the sendBeacon request successfully, but cannot seem to read the object on my Node.js Express server. Here is my Send Beacon js code:

I'm making a program to scrap some websites, and I'm finding a problem when scraping one of them. On the others I've found my way using Selenium + BS4 to get the information I need and navigating the pages.

The page is this one: https://www.borm.es/#/home/sumario/21-11-2020

Now, the objective is to get all the paragraphs from the class: ng-binding, and the links of each "VER ANUNCIO" that each one has below them.

Usually I would use soup.find_all() to get all of them and navigate the tree or use Selenium to get all the elements using XPATH/CSS SELECTOR.

The problem I'm facing is that find_all(), or find() is returning nothing, (empty list or None), and Selenium returns None too.

I've tried checking if the elements are inside a frame, which I think they're not. I've tried WebDriver wait to see if the page should stop to load before doing something. Different classes/tags give same result.

Now, when I print the BeautifulSoup object, it returns this instead of the HTML code I see inspecting the page:

I'm working on a tracker that should collect some data on the websites of our clients and send it to our api using fetch request when site users leave the page.

The idea was to use beforeunload event handler to send the request, but I've read here that In order to cover most browsers I also need to use unload event handler.

This is the relevant part of tracker code that our clients will put on their websites: