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Claude Code supports various enterprise network and security configurations through environment variables. This includes routing traffic through corporate proxy servers, trusting custom Certificate Authorities (CA), and authenticating with mutual Transport Layer Security (mTLS) certificates for enhanced security. Set these environment variables before you launch Claude Code. Variables exported in your shell are read once at startup, so a running session doesn’t pick up later changes to your shell environment.
All environment variables shown on this page can also be configured in settings.json.

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Proxy configuration

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Environment variables

Claude Code respects standard proxy environment variables. In Claude Desktop sessions where the app manages the provider connection, Claude Code reads them only from managed settings and ~/.claude/settings.json; see mTLS authentication for the scope rules.