[BUG] HTTP 407 error for pretooluse http hook with authentication in sandbox

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

we started to see some errors with pretooluse hook from claude code since version v2.1.186.

PreToolUse:Bash hook error
HTTP 407 from [hook URL]

This happens only when sandbox is turned on, and with v2.1.186

Note that we already have this domain in the allowedDomains from the sandbox settings.

What Should Happen?

should be no error from hook.

Error Messages/Logs

PreToolUse:Bash hook error
HTTP 407 from [hook URL]

Steps to Reproduce

1. enable sandbox
2. bash echo hello world

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.185

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_