I am creating a custom plugin in nodebb and I want to fetch a list of all authentic and confirmed users over there.
And see if you've set up correctly. BTW, to tell if your ISP does support WS, you can always just check this forum to see if you're reproducing the same issue. If not, then it's a configuration issue on your end
Yes, the polling 200 status indicates nothing is wrong. Everything you're seeing is completely normal of nodes Socket.IO.
Furthermore, polls are done on port 80 http, so it would never be blocked. Webscoket traffic in general is done ona range of ports, none of which ISP's filter (I've worked for an ISP). The only port I know that SOME NorthAmerican ISP's block is SMPT incoming and even that is rare.