I mentioned this in a podcast recently; fingerprinting of proxy servers using QUIC is a lot harder as UDP doesnt have enough headers to allow for unique characteristics like a TCP does.
Theres no way to include a timestamp in a UDP datagram so all timestamps received would be from the client machine.
BrighData offer H3/QUIC but only in beta and you have to contact their sales team as far as I'm aware.
We (PingProxies) might be the only company to offer H3 to the proxy/QUIC to the target using the CONNECT-UDP method publicly. Although, it is in beta/unstable until I merge my changes into Rust's H3 library.
If you wanna play around with it, email me and I'll get you some credit. I think theres potential for stealth since outdated proxy clients/servers mean automated actors never use H3.
The proxy industry is full of another 100 companies saying they offer H3/QUIC, when they mean UDP proxying using SOCKS. I suppose the knowledge gap and what customers care about (protocol to end target) is very different to what I care about (being right/protocol to the proxy server).
> BrighData offer H3/QUIC but only in beta and you have to contact their sales team as far as I'm aware.
That's what I thought too, but it's working for me. (I've sent a lot of tickets, maybe they've put our account as something special without telling me, but doubt it.)
> If you wanna play around with it, email me and I'll get you some credit.
Done, emailed! :) Thanks!
> The proxy industry is full of another 100 companies saying they offer H3/QUIC, when they mean UDP proxying using SOCKS.
Out of the large players I've tested, none actually seem to even support SOCKS5's UDP ASSOCIATE. (I have not tested PingProxies yet.)
> I suppose the knowledge gap and what customers care about (protocol to end target) is very different to what I care about (being right/protocol to the proxy server).
I think there's a knowledge gap between the people making the sales landing pages, and the folks who actually run/maintain the proxy servers. There's some large vendors that advertise UDP support (for residential and/or mobile proxies) that I have yet to actually see working.
Interesting!
So far I've only seen Bright Data (among the large players) offer UDP proxying over QUIC/HTTP3, but that's pretty limiting since less than half of sites have HTTP/3 enabled to begin with.