Firstly, for whatever reason, your response is a 404 (not found)
Forgetting that for 1 moment, even if you did get the full node-red discourse page, it would likely NOT contain any entries.
What many sites (including discourse) do is use JavaScript to call APIs (other URLs) that return the data (in a nice format like JSON) then JS is used to render the values e.g:
On static web pages, where you get ALL of the HTML (with the tables and rows pre-populated) -you would use the HTML nodes (and carefully crafted selectors) to break it down.
