[fpc-pascal] web app and application persistency

[Marco van de Voort]

In our previous episode, Andrew Brunner said:
> The only thing I can think of would be packet inspection.  Firewalls
> included with Linux and Windows do not perform "deep" packet
> inspection.  They only allow/deny packets with specific ports over
> either TCP or UDP.

Usually they deny all ports by default and route 80, 8080 and 443 to a
proxy, which *does* understand http.

It might be that websockets are too much like normal http requests that a
proxy will put them through, but I'd check that before betting  on
websockets.