What
The proxyAuthHelper setting names a command that prints a sign-in value for a proxy server that requires one. Claude Code sends that value in a Proxy-Authorization header. It has two internal ways of making connections through a proxy, and before, only one of them attached this header. Now both do, using the value the helper last returned. Client certificates and the CLAUDE_CODE_PROXY_RESOLVES_HOSTS behaviour are unchanged.
Why
If you work behind a proxy that requires sign-in, some connections could fail even with proxyAuthHelper set up. Those connections should now carry the sign-in value too.
Names in the bundleproxyAuthHelper
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear which of Claude Code's requests go through the route that now gets the header.