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Implement CONNECT-UDP for proxying HTTP/3 through HTTP/3 proxy #6

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mila opened this issue Feb 9, 2023 · 1 comment
Open

Implement CONNECT-UDP for proxying HTTP/3 through HTTP/3 proxy #6

mila opened this issue Feb 9, 2023 · 1 comment

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@mila
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mila commented Feb 9, 2023 •
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HTTP/3 proxies can support CONNECT-UDP for proxying UDP packets. This can be used to proxy QUIC and HTTP/3 through HTTP/3 proxies.

  • Implement ProxyClientSession.connect_udp() and use it for proxying of HTTP/3 traffic.
  • Add CONNECT-UDP support to ProxyServer.
@mila
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mila commented Feb 9, 2023

At the moment, hface uses AnyIO UDPSocket (or any other UnreliableObjectStream[UDPPacketType]) for UDP transport. With this transport, every packet can be sent to a different address. CONNECT-UDP is not compatible with this approach because we need to specify a destination address at the connection time.

It can be best to switch to ConnectedUDPSocket (or more generally UnreliableObjectStream[bytes]):

  • I don't think that clients need to supports servers migrating between IP addresses.
  • Servers already use QUICListenerStream for routing packets and this class has a remote_address attributes.
  • This could help to get rid of some hacks that we use when we need remote_address for HTTP/3 connections.

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