3 ms·

Certainty this can’t be true? I believe you but do you have any actual examples?

• londons_explore 3y ago
  All UK government offices doesn't seem to allow it... That's a couple of million potential users right away.
  • HackerThemAll 3y ago
    Just use SignalR. It'll automatically choose whatever comes through.
• paddybyers 3y ago
  Yes it's true. At Ably we support websockets, SSE and comet fallbacks (simple long-polling and streamed long-polling). It's less and less common but there are firewalls that fail to handle websockets correctly, or simply block them. I can't name specific companies/examples, but call centers are one example - the network and desktop environments are fully locked down. We also see in these cases that streamed HTTP can also be broken by the firewall - for example a chunked response can be held back by the firewall and only forwarded to the client when the request ends, as a fixed-length response. Obviously that breaks SSE and means you can't just use streamed comet as a fallback when websockets don't work.
  • cpursley 3y ago
    Wild, thanks!