https://github.com/python/cpython/commit/8af4712a16e4b7d1b60f1faec13cd7a88da... commit: 8af4712a16e4b7d1b60f1faec13cd7a88da95f6a branch: master author: idomic <michael.ido@gmail.com> committer: GitHub <noreply@github.com> date: 2020-02-24T06:59:40-08:00 summary: bpo-39128: Added algorithm description (GH-18624) # [bpo-39128](https://bugs.python.org/issue39128): happy eyeballs description # [3.9] 39128 - happy eyeballs description (GH-18624) # [3.8] 39128 - happy eyeballs description (GH-18624) https://bugs.python.org/issue39128 files: M Doc/library/asyncio-eventloop.rst diff --git a/Doc/library/asyncio-eventloop.rst b/Doc/library/asyncio-eventloop.rst index 3acd79d283580..d60a6ce95cdd8 100644 --- a/Doc/library/asyncio-eventloop.rst +++ b/Doc/library/asyncio-eventloop.rst @@ -451,6 +451,17 @@ Opening network connections Added the *happy_eyeballs_delay* and *interleave* parameters. + Happy Eyeballs Algorithm: Success with Dual-Stack Hosts. + When a server's IPv4 path and protocol are working, but the server's + IPv6 path and protocol are not working, a dual-stack client + application experiences significant connection delay compared to an + IPv4-only client. This is undesirable because it causes the dual- + stack client to have a worse user experience. This document + specifies requirements for algorithms that reduce this user-visible + delay and provides an algorithm. + + For more information: https://tools.ietf.org/html/rfc6555 + .. versionadded:: 3.7 The *ssl_handshake_timeout* parameter.