URL Standard-compatible IPv4 embedded IPv6 host parser

Category: Miscellaneous
Type: Chromium catches up
Status: Enabled by default (Chrome 117)
Intent stage: None

Breaking change: Yes
Enterprise impact: None
Chromium flag: StrictIPv4EmbeddedIPv6AddressParsing
Spec maturity: Published standard
Web Platform Tests: Yes

WPT details: https://wpt.fyi/results/url/url-constructor.any.html%3Fexclude%3D(file%7Cjavascript%7Cmailto)?label=experimental&label=master&aligned&view=subtest One of the test cases are: Parsing: <http://[::1.2.3.]> against <http://other.com/>

Summary

The behavior of parsing IPv4 embedded IPv6 host parser will be updated to strictly follow the web URL standard: https://url.spec.whatwg.org/#concept-ipv6-parser The introduced restrictions on the IPv6 address are: * The embedded IPv4 address shall always consist of 4 parts. Addresses with less than 4 parts like http://[::1.2] will be no longer valid. The feature is a part of the URL interop 2023.

Standards & signals

Specification: https://url.spec.whatwg.org/#concept-ipv6-parser
Firefox: Shipped/Shipping — The IPv6 parser in Safari has already forced the check.
Safari: Shipped/Shipping — The IPv6 parser in Safari has already forced the check.
Web developers: No signals
Tracking bug: https://crbug.com/1411619

Ecosystem

Web Platform Tests: https://wpt.fyi/results/?q=url%2Furl-constructor
Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+URL%20Standard-compatible%20IPv4%20embedded%20IPv6%20host%20parser
MDN Web Docs: https://developer.mozilla.org/en-US/search?q=URL%20Standard-compatible%20IPv4%20embedded%20IPv6%20host%20parser
Baseline status: https://webstatus.dev/?q=URL%20Standard-compatible%20IPv4%20embedded%20IPv6%20host%20parser

Samples: https://chromium-review.googlesource.com/c/chromium/src/+/4206417

View on chromestatus.com