What is the language and tools for processing data received via http?

Question

IDE

The essence is to get data from the browser with the generated page. The page is open with the game on the unit if I'm not mistaken. I want to start writing something to pull out the data I'm interested in and process it, sort it, rank it. In general, convert to a form convenient for me. So far, the view is textual and tabular. Naturally, I do not have admin access to the remote http server.
Actually, I would like to learn how to write something that will connect to this remote server via http instead of my browser, receive information and transform it into the form I want. Hence the questions from the beginner, on what to write what to study. What is the toolkit I need for my task. Perhaps I need some browser code and create an add-on for it? I consider the task as practically interesting for me and teaching for learning programming.

Answer 1

1. If you open the "Page Source" in the browser (for example, in Firefox it's the right mouse button and the View Page Source item) and you see what you need - then it's any language that you know better.
2. If the text you are interested in is inside the picture, and is not a separate entity - any language that you know if there is a letter recognition library for it. Or a graphic object recognition library, if you don't need letters.
3. If the browser forms the page only after loading and according to paragraph 1 you do not receive data, but receive them only in a live browser, then as you were told or Selenium.
4. Same as point 3, more resource-efficient option. SlimerJS etc. script-driven "headless" browsers. There JavaScript.

Answer 2

selenium
Possible in python, java, ruby, c# or node.