We run the original HE algorithm as-is (which manages the timing, concurrency, races), but modify the effects that are run so that they collect all successfully produced values. Happy Eyeballs is a technique that helps maintain a good user experience on dual stack hosts even when one of IPv4 or IPv6 connectivity is defective. I think I’ve come up with a better solution: embracing the fact that multiple sockets might end up being open. It just to point out that in Happy Eyeballs we have a kind of common gauge, an example problem we can use to compare different ideas: How easy it is to implement Happy Eyeballs with each proposed solution? With the work going on for Network Quality Estimation 5, and with the heavy variance of IPv6 quality in different locations (e.g. With IPv6-only network connectivity becoming increasingly common, misconfigurations in DNS servers can cause requests to fail, even when connectivity is available through alternative servers. This functionality is also implemented in curl, iOS, Android, etc. This post is not meant to propose anything specific. In the browser, this is handled for you using the Happy Eyeballs algorithm. At one point, she had her face in her hands and rolled her eyes when there was another discussion about the Biden Administration coming after Trump. When successful you can switch to the hard mode, where the DNS queries are done asynchronously, as described in the RFC. This crate implements the Happy Eyeballs Connections setup described in RFC 8305. When proving your initial implementation of structured concurrency you can start with with a stripped down version which does does the DNS query synchronously, then does actual connecting in asynchronous manner. Happy Eyeballs is a technique used to provide a good user experience when connecting from dual-stack (IPv4 and IPv6) clients. The nice thing is that it exhibits all the aspects of structured concurrency (cancelation, error handling, different kind of async tasks etc.) which still remining relatively simple.Īnother nice feature is that it comes with “easy” and “hard” mode. At the moment there’s at least Trio and libdill version out there. By the way: Chrome on OSX suffers from the same problem.When explaining structured concurrency to newbies, but as well when the different ways to implement it Happy Eyeballs protocol (RFC 8305) has roven to be very instructional. It will repeatedly attempt to load, via this browser instance, a randomly named dual stack javascript resource. Please Apple, dont discourage early IPv6 adopters and correct this behavior. Still I believe we should give IPv6 a preference. Moreover, the number of switchovers should be limited since it is almost impossible to finish a secure transaction sequence.Īs most Internet providers do not yet support IPv6, IPv6 enabled networks do so by tunneling, which makes the IPv6 network slightly slower than the IPv4 network. In my opinion, Safari should give IPv6 a preference, and should only fallback to IPv4 if the connection is really bad. Most sites that contain sensitive information will break the connection for security reasons if the IP address changes. What is even worse, the browser toggles protocol within a secure SSL session (e.g. Somewhat related to issue 506 (Happy Eyeballs). I tested ParallelConnectionStrategy with our API endpoint and got the datacenter I'm close to, as expected, and the time it look was comparable to my RTT to that datacenter (5-10ms in most cases). OSX / Safari seems to choose protocol IPv4 or IPv6 based on best network performance (syn-ack roundtrip time ?). The ParallelConnectionStrategy implementation will initiate a TCP handshake to each IP concurrently.
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