npm 429 Too Many Requests on `browser-ui-test`

[jieyouxu]

Happened in x86_64-gnu-tools #145847 (comment).

npm ERR! npm ERR! code E429
npm ERR! npm ERR! 429 Too Many Requests - GET https://registry.npmjs.org/c8
npm ERR! 
npm ERR! npm ERR! A complete log of this run can be found in: /home/user/.npm/_logs/2025-08-25T13_42_52_187Z-debug-0.log

npm ERR! A complete log of this run can be found in: /home/user/.npm/_logs/2025-08-25T13_42_48_628Z-debug-0.log
npm install did not exit successfully

thread 'main' panicked at src/tools/rustdoc-gui-test/src/main.rs:69:10:
unable to install browser-ui-test: Custom { kind: Other, error: "npm install returned exit code exit status: 1" }
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/panicking.rs:697:5
   1: core::panicking::panic_fmt
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/core/src/panicking.rs:75:14
   2: core::result::unwrap_failed
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/core/src/result.rs:1765:5
   3: rustdoc_gui_test::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
Bootstrap failed while executing `test tests/rustdoc-gui --stage 2 --test-args --jobs 1`
Build completed unsuccessfully in 0:06:47

[Noratrieb]

I saw the same thing at work yesterday, many npm installs failed with 429.