If it’s extremely popular, NodeJS can merge it in, and the code can be removed from here. Ultimately though, I think it would probably be better for the community to develop something like this and test it out before merging it into NodeJS anyway and see the response it gets. It would be great if node could implement this natively, but there are currently no plans to do that. So, if you’re on a IPv6-only network, you don’t have to try every single IPv4 address before you get to the IPv6 address. ![]() In curl’s implementation, which I prefer, its starts with the first address, then tries the next address of a different family. Still, this is better than dropping the request entirely. It could be a good idea to log a warning for the user that the first address sent by getaddrinfo was not available, as the 300ms timeout adds latency to every connection. Ideally, fetch would send the first address first, wait 300ms, and if no connection was made, continue down the line of addresses returned by dns.lookup. This can cause extremely confusing errors for developers using dual stack networks where IPv4 support periodically drops, because it’s very hard to find what is causing the issue (I should know). Note, that verbatim=true will probably become the default. Currently, due to a poor design decision by NodeJS developers, IPv4 addresses are preferred, even when this contradicts RFC 6724. Btw, semi-related, the DNS lookup should be returning results with verbatim=true. Net.createConnection attempts to create a connection with the default dns.lookup server. I would propose node-fetch handle failover similarly to the browser. It provides a drop-in replacement for std::net::TcpStream::connect, and for async usage tokio::net::TcpStream::connect. This crate implements the Happy Eyeballs Connections setup described in RFC 8305. 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.īrowsers typically try to create a connection, wait 300ms, then try the next available server provided by getaddrinfo in the kernel.Ĭurrently, node-fetch implements no failover for support for timed-out connections. Happy Eyeballs is a technique used to provide a good user experience when connecting from dual-stack (IPv4 and IPv6) clients. This functionality is also implemented in curl, iOS, Android, etc… Cette vidéo explique lutilisation de Happy Eyeballs dans un contexte Dual-Stack (ipv4 et ipv6)Le lien vers le site de Microsoft et qui va vous permettre da. In the browser, this is handled for you using the Happy Eyeballs algorithm. If we end up not enabling Happy Eyeballs by default, this issue will at least hold the reason why.Is your feature request related to a problem? Please describe.ĭNS misconfigurations or server down time can cause fetch requests not to be fulfilled. Setting only controls Happy Eyeballs part, so having NoHappyEyeballs instead would allow zero-valued dialers to work seamlessly with broken IPv6. This protects users from indefinite (half of default infinite connect timeout is still infinity) stalls if resolver returns both A and AAAA (or even AAAAA), but the network drops fancy IPv6 packets on the floor.Ĭurrent name DualStack is also slightly confusing, because Go dials both stacks in either case. I think Go should also have this on by default. Implementations of Happy Eyeballs stacks exist in Google's Chrome web browser, Opera 12.10, Firefox version 13, OS X, and cURL. ![]() Enable dualstack in every net.Dialer, fixes #9364 grafana/grafana#9367.We fixed an issue in Grafana that caused 15s stalls for us: ![]() However, it was turned on in http.DefaultTransport: #15324. This setting is off by default in zero-value net.Dialer, net.Dial() and friends. This allows a client to tolerate networks where one address // family is silently broken. DualStack enables RFC 6555-compliant "Happy Eyeballs" // dialing when the network is "tcp" and the host in the // address parameter resolves to both IPv4 and IPv6 addresses. Happy Eyeballs v2 & Reporting IPv6 Failures RIPE 75 Dubai October 2017 Jordi Palet () - 1 Happy Eyeballs v1 Happy Eyeballs v2 & Reporting IPv6 Failures RIPE 75 Dubai October 2017 Jordi Palet () - 1 Happy Eyeballs v1 DOCSLIB.
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