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若麒
8a0de83c24
Node's built-in fetch (undici) ignores proxy environment variables, so bl always connected directly and failed with ECONNRESET behind a VPN or corporate proxy. Install an EnvHttpProxyAgent as the global dispatcher at startup, but only when a proxy variable is actually set — behavior is unchanged otherwise. Lowercase variables take precedence over uppercase (curl convention) and NO_PROXY is honored. Values are trimmed and passed explicitly to work around undici reading env vars with ??, where an empty lowercase variable (https_proxy="") masks a configured uppercase one. Invalid proxy URLs fail with a clear usage error instead of a stack trace, and the ECONNRESET hint now suggests exporting HTTPS_PROXY. Tests are fully offline and need no credentials: unit tests cover env parsing, and the e2e test runs a minimal probe (setupProxyFromEnv + a bare fetch) against a .invalid host through a local CONNECT proxy to verify traffic routes through the proxy, NO_PROXY is honored, no dispatcher is installed when unset, and invalid values error clearly.