id: proxy-env-mismatch
title: "Uppercase and lowercase proxy variables differ"
date: 2026-05-16
symptoms:
  - "External model calls time out even though a proxy appears to be configured."
  - "GitHub OAuth or provider tests fail intermittently from the agent environment."
patterns:
  - "HTTP_PROXY and http_proxy point to different hosts"
  - "HTTPS_PROXY and https_proxy point to different hosts"
  - "ALL_PROXY and all_proxy point to different hosts"
  - "old WSL gateway proxy remains in lowercase variables"
likely_causes:
  - "Different HTTP clients read different proxy environment variable names."
  - "The shell inherited stale lowercase proxy values from an older session."
fix_steps:
  - "Set HTTP_PROXY, HTTPS_PROXY, ALL_PROXY, http_proxy, https_proxy, all_proxy, NO_PROXY, and no_proxy consistently."
  - "Restart LangBot with the corrected proxy environment."
verification: "Run env | rg -i '^(http|https|all|no)_?proxy=' and confirm uppercase/lowercase pairs are consistent, then run pipeline-debug-chat."
related_cases:
  - pipeline-debug-chat
  - provider-deepseek
  - webui-login-state