Set the proxy where the specific coding agent reads its configuration, then confirm its supported proxy schemes, authentication, certificate trust, and sandbox rules. Proxy variables are not a universal switch: Claude Code explicitly does not support SOCKS, GitHub Copilot documents HTTP proxy behavior, and the available OpenAI documentation does not establish Codex CLI proxy support.
Start with the process that needs network access
A coding workflow may involve several distinct network clients: an editor extension, the agent process, commands launched by the agent, and tools such as package managers. Configuring one does not guarantee that the others use the same proxy. Identify which process is failing, then use that product’s documented settings rather than assuming that a system-wide environment variable covers every component.
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For products that read proxy variables, set them in the environment used to launch the application and restart the application if necessary. The variable names, precedence, and supported URL schemes differ by product. Do not assume support for lowercase variables, NO_PROXY, HTTPS proxy endpoints, or SOCKS unless the product documents it.
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Configure Claude Code
Anthropic’s Claude Code corporate-proxy documentation describes HTTP and HTTPS proxy configuration using HTTPS_PROXY and HTTP_PROXY. It also states, “Claude Code does not support SOCKS proxies.” The same documentation says NO_PROXY is not currently supported. See Anthropic’s corporate proxy guidance; because support can change, check the current page if these details affect a deployment.
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Authentication and certificates
Claude Code documentation describes basic authentication by embedding credentials in the proxy URL. Avoid placing passwords in checked-in scripts or shared configuration files; use a trusted secret store or managed launcher where possible. For advanced authentication such as NTLM or Kerberos, Anthropic recommends using an LLM Gateway.
For TLS inspection, Claude Code documents SSL_CERT_FILE and NODE_EXTRA_CA_CERTS for specifying a custom certificate bundle. Use only a certificate obtained through your organization’s trusted IT process.
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Configure GitHub Copilot
GitHub documents basic HTTP proxy setups for Copilot. It checks these environment variables in descending priority: HTTPS_PROXY, https_proxy, HTTP_PROXY, then http_proxy. The highest-priority URL is used for both HTTP and HTTPS requests. GitHub’s documentation says proxy URLs beginning with https:// are not currently supported. Follow the product-specific setup for your editor in GitHub’s network settings guidance.
Authentication and certificate trust
Copilot documentation supports basic authentication and Kerberos. Kerberos may require an installed system library and an active ticket. Copilot reads certificates from the operating-system trust store and from the file specified by NODE_EXTRA_CA_CERTS. GitHub warns that ignoring certificate errors can create security issues; installing a custom root certificate also trusts that certificate’s issuer. Obtain certificates through your organization’s trusted IT process. See GitHub’s editor and certificate instructions.
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Account for Copilot CLI sandbox behavior
Copilot CLI’s sandbox proxy policy is separate from ordinary editor proxy setup, and its behavior varies by operating system. The constraints below apply to the documented Copilot CLI sandbox, not to every coding agent or every kind of network request.
| Platform | Documented sandbox proxy behavior |
|---|---|
| macOS | Sets proxy environment variables in the sandbox. Only programs that honor those variables use the proxy. |
| Linux | Enforces access through a private network namespace. The proxy endpoint must be reachable over IPv4, and credentials cannot be embedded in the proxy URL. |
| Windows | The documented sandbox proxy policy is not supported. |
The CLI reference also describes a proxyUrl setting and a separate sandbox proxy policy. Check GitHub’s CLI command reference for the exact configuration applicable to your version and platform.
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Do not infer Codex CLI support from another OpenAI CLI
The official OpenAI sources reviewed do not establish a Codex CLI proxy configuration or confirm its support for HTTP, HTTPS, SOCKS, custom certificates, or sandbox proxying. OpenAI’s CLI API reference discusses HTTP and SOCKS proxies in its own documented API CLI context and rejects HTTPS proxies in the stated mutual TLS context; that is not documentation of Codex CLI behavior. Likewise, OpenAI’s self-hosted sandbox documentation names outbound endpoints but does not provide proxy settings. Consult current Codex-specific documentation or verify behavior in your deployment rather than applying settings from a different OpenAI tool.
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Troubleshoot a proxy connection
- Identify the failing client. Determine whether the request comes from the agent, an editor extension, sandboxed shell command, package manager, or another tool.
- Check the product’s documented settings. Confirm variable names and precedence, then restart the application if it reads environment variables only at launch.
- Validate the endpoint configuration. Check the scheme, host, port, authentication method, and whether the agent explicitly supports the chosen protocol. In particular, do not substitute a SOCKS URL where the product documents HTTP proxies only.
- Check TLS trust. If your organization inspects TLS, configure its CA certificate using the agent’s supported trust mechanism. Avoid disabling certificate verification as a routine fix.
- Test reachability through the proxy. GitHub’s Copilot troubleshooting page gives this Copilot-specific example:
curl --verbose -x http://YOUR-PROXY-URL:PORT -i -L https://copilot-proxy.githubusercontent.com/_ping. A successful check returns HTTP 200. Use the actual service endpoint for your product and only where your organization’s policy permits. See GitHub’s network troubleshooting guidance. - Investigate timeouts and resets. Check credentials, proxy and firewall allowlists, certificate trust, and any additional network restrictions imposed by the agent’s sandbox.
Quick compatibility reference
| Product or context | Proxy details established in official documentation |
|---|---|
| Claude Code | Uses HTTPS_PROXY and HTTP_PROXY for HTTP/HTTPS proxy configuration; SOCKS and NO_PROXY are not supported in the cited corporate-proxy guidance. Documents basic credentials in the proxy URL and custom certificate variables. |
| GitHub Copilot in editors | Documents HTTP proxy setup, basic authentication, Kerberos, a specific environment-variable priority, and OS trust store or NODE_EXTRA_CA_CERTS certificates. HTTPS proxy URLs beginning with https:// are not currently supported. |
| GitHub Copilot CLI sandbox | Documents a proxyUrl setting and platform-specific sandbox behavior: macOS environment variables, Linux network-namespace enforcement with IPv4 and no URL-embedded credentials, and no support for this policy on Windows. |
| OpenAI Codex CLI | Proxy-variable, protocol, certificate, and sandbox behavior not established by the OpenAI sources described here. The API CLI documentation is for a separate tool. |
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