Method shouldUseProxy

lib/internal/http.js:149–192

(hostname, port)

  // See: https://about.gitlab.com/blog/we-need-to-talk-no-proxy
  // TODO(joyeecheung): share code with undici.
  shouldUseProxy(hostname, port) {
    const bypassList = this.bypassList;
    if (this.bypassList.length === 0) {
      return true; // No bypass list, always use the proxy.
    }

    const host = hostname.toLowerCase();
    const hostWithPort = port ? `${host}:${port}` : host;

    for (let i = 0; i < bypassList.length; i++) {
      const entry = bypassList[i];

      if (entry === '*') return false;  // * bypasses all hosts.
      if (entry === host || entry === hostWithPort) return false;  // Matching host and host:port

      // Follow curl's behavior: strip leading dot before matching suffixes.
      if (entry[0] === '.') {
        const suffix = entry.substring(1);
        if (host === suffix || (host.endsWith(suffix) && host[host.length - suffix.length - 1] === '.')) return false;
      }

      // Handle wildcards like *.example.com
      if (entry.startsWith('*.') && host.endsWith(entry.substring(1))) return false;

      // Handle IP ranges (simple format like 192.168.1.0-192.168.1.255)
      // TODO(joyeecheung): support IPv6.
      if (entry.includes('-') && isIPv4(host)) {
        let { 0: startIP, 1: endIP } = entry.split('-');
        startIP = startIP.trim();
        endIP = endIP.trim();
        if (startIP && endIP && isIPv4(startIP) && isIPv4(endIP)) {
          const hostInt = ipToInt(host);
          const startInt = ipToInt(startIP);
          const endInt = ipToInt(endIP);
          if (hostInt >= startInt && hostInt <= endInt) return false;
        }
      }

      // It might be useful to support CIDR notation, but it's not so widely supported
      // in other tools as a de-facto standard to follow, so we don't implement it for now.
    }

    return true; // If no matches found, use the proxy.
  }
}

function parseProxyUrl(env, protocol) {