Axios supports proxy environment variables and evaluates "NO_PROXY" exclusions in the Node.js adapter. CIDR-form "NO_PROXY" entries such as "127.0.0.0/8", "10.0.0.0/8", or "169.254.169.254/32" are not interpreted as IP ranges. As a result, a request to an IP address inside a configured CIDR exclusion can still be sent through the configured proxy. This affects deployments that rely on CIDR notation to keep loopback, private, Kubernetes, CI, or cloud metadata traffic away from proxy infrastructure.