[BUG] HTTP_PROXY fails when using nvm

Environment

• Platform (select one):
• [X] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• Claude CLI version: 1.0.100 (Claude Code)
• Operating System: MacOS Sonoma 14.7.1 (Apple Silicon)
• Also replicated in Debian 12.11 (Bookworm)
• Terminal: iTerm2 3.5.14
• Also replicated in QTerminal v2.1.0

Bug Description

Claude fails to connect to Anthropic's API when HTTP_PROXY or HTTPS_PROXY are set, but only when using a node version installed through nvm.

Steps to Reproduce

1. Install nvm: https://github.com/nvm-sh/nvm?tab=readme-ov-file#installing-and-updating
2. Use the system node: nvm use system
3. Verify the node version: node --version // v24.6.0 in my case
4. Install claude code: npm install -g @anthropic-ai/claude-code
5. Set HTTP proxies: export HTTP_PROXY=http://localhost:8080 && export HTTPS_PROXY=http://localhost:8080
6. Observe that HTTP proxying works fine:

$ claude
╭───────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code!                         │
│                                                   │
│   /help for help, /status for your current setup  │
│                                                   │
│   cwd: <redacted>                                 │
╰───────────────────────────────────────────────────╯

> This is a test. Say hello.

⏺ Hello!

1. (optional) Confirm in your proxy logs that the requests came through
2. Install some other version of node through nvm: nvm install v24.6.0

• Note: This is the exact same NodeJS version as my system has

1. Use the installed version: nvm use v24.6.0
2. Re-set the proxy variables: export HTTP_PROXY=http://localhost:8080 && export HTTPS_PROXY=http://localhost:8080
3. Observe that API requests now fail:

$ claude
╭───────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code!                         │
│                                                   │
│   /help for help, /status for your current setup  │
│                                                   │
│   cwd: <redacted>                                 │
╰───────────────────────────────────────────────────╯

> This is a test. Say hello
  ⎿  API Error (Connection error.) · Retrying in 5 seconds… (attempt 4/10)
    ⎿  TypeError (fetch failed)

Unfortunately, my proxy logs are not sophisticated enough to diagnose a root cause here.