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Documentation Index

Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt

Use this file to discover all available pages before exploring further.

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.
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: 
# HTTPS proxy (recommended)
export HTTPS_PROXY=https://proxy.example.com:8080

# HTTP proxy (if HTTPS not available)
export HTTP_PROXY=http://proxy.example.com:8080

# Bypass proxy for specific requests - space-separated format
export NO_PROXY="localhost 192.168.1.1 example.com .example.com"
# Bypass proxy for specific requests - comma-separated format
export NO_PROXY="localhost,192.168.1.1,example.com,.example.com"
# Bypass proxy for all requests
export NO_PROXY="*"
Claude Code does not support SOCKS proxies.

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Basic authentication

If your proxy requires basic authentication, include credentials in the proxy URL: 
export HTTPS_PROXY=http://username:password@proxy.example.com:8080
Avoid hardcoding passwords in scripts. Use environment variables or secure credential storage instead.
For proxies requiring advanced authentication (NTLM, Kerberos, etc.), consider using an LLM Gateway service that supports your authentication method.

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CA certificate store

By default, Claude Code trusts both its bundled Mozilla CA certificates and your operating system’s certificate store. Enterprise TLS-inspection proxies such as CrowdStrike Falcon and Zscaler work without additional configuration when their root certificate is installed in the OS trust store.
System CA store integration requires the native Claude Code binary distribution. When running on the Node.js runtime, the system CA store is not merged automatically. In that case, set NODE_EXTRA_CA_CERTS=/path/to/ca-cert.pem to trust an enterprise root CA.
CLAUDE_CODE_CERT_STORE accepts a comma-separated list of sources. Recognized values are bundled for the Mozilla CA set shipped with Claude Code and system for the operating system trust store. The default is bundled,system. To trust only the bundled Mozilla CA set: 
export CLAUDE_CODE_CERT_STORE=bundled
To trust only the OS certificate store: 
export CLAUDE_CODE_CERT_STORE=system
CLAUDE_CODE_CERT_STORE has no dedicated settings.json schema key. Set it via the env block in ~/.claude/settings.json or directly in the process environment.

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Custom CA certificates

If your enterprise environment uses a custom CA, configure Claude Code to trust it directly: 
export NODE_EXTRA_CA_CERTS=/path/to/ca-cert.pem

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mTLS authentication

For enterprise environments requiring client certificate authentication: 
# Client certificate for authentication
export CLAUDE_CODE_CLIENT_CERT=/path/to/client-cert.pem

# Client private key
export CLAUDE_CODE_CLIENT_KEY=/path/to/client-key.pem

# Optional: Passphrase for encrypted private key
export CLAUDE_CODE_CLIENT_KEY_PASSPHRASE="your-passphrase"

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Network access requirements

Claude Code requires access to the following URLs. Allowlist these in your proxy configuration and firewall rules, especially in containerized or restricted network environments.
URLRequired for
api.anthropic.comClaude API requests
claude.aiclaude.ai account authentication
platform.claude.comAnthropic Console account authentication
downloads.claude.aiPlugin executable downloads; native installer and native auto-updater
storage.googleapis.comNative installer and native auto-updater on versions prior to 2.1.116
bridge.claudeusercontent.comClaude in Chrome extension WebSocket bridge
If you install Claude Code through npm or manage your own binary distribution, end users may not need access to downloads.claude.ai or storage.googleapis.com. Claude Code also sends optional operational telemetry by default, which you can disable with environment variables. See Telemetry services for how to disable it before finalizing your allowlist. When using Amazon Bedrock, Google Vertex AI, or Microsoft Foundry, model traffic and authentication go to your provider instead of api.anthropic.com, claude.ai, or platform.claude.com. The WebFetch tool still calls api.anthropic.com for its domain safety check unless you set skipWebFetchPreflight: true in settings. Claude Code on the web and Code Review connect to your repositories from Anthropic-managed infrastructure. If your GitHub Enterprise Cloud organization restricts access by IP address, enable IP allow list inheritance for installed GitHub Apps. The Claude GitHub App registers its IP ranges, so enabling this setting allows access without manual configuration. To add the ranges to your allow list manually instead, or to configure other firewalls, see the Anthropic API IP addresses. For self-hosted GitHub Enterprise Server instances behind a firewall, allowlist the same Anthropic API IP addresses so Anthropic infrastructure can reach your GHES host to clone repositories and post review comments.

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Additional resources