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I am in a network that blocks most outgoing UDP traffic, e.g. no UDP 443.

When I turn on Inspector of FireFox, I see that one HTTP/3 request went thru:

enter image description here

However, when I use Wireshark to capture the packets. It found no QUIC / UDP packets, not even the initial request.

I am positive that no UDP packet actually made it out to the internet. What could be the reason Firefox managed to make that HTTP/3 request?

some user
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