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> between two web browsers

They were never inteded to be active senders or p2p workers. I know, we've come a long way in the past 2 decades, but I never expected this to be the job of the browser. I'm also aware of webRTC and I'm a bit uncertain why that can't be used to send/receive files.

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There are a bunch of WebRTC file transfer web apps but they unfortunately all suffer from the legacy cruft that WebRTC brought along. The only data channels are UDP and things like STUN / TURN / ICE are needed to have any hope of breaking through NAT, often with disappointing results.

Ya, for Dat[1], we had a WebRTC implementation and it was unreliable compared to our other clients. We are hoping other in browser p2p options get developed, e.g. https://github.com/noffle/web-udp.

[1] https://datproject.org

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