http: remove TODO and add condition

Author: haramj

lib/internal/http.js

@@ -192,17 +192,16 @@ class ProxyConfig {
       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('-')) {
         let { 0: startIP, 1: endIP } = entry.split('-');
         startIP = startIP.trim();
         endIP = endIP.trim();
-        if (isIPv4(startIP) && isIPv4(endIP) && isIPv4(host)) {
+        if (startIP && endIP && isIPv4(startIP) && isIPv4(endIP) && isIPv4(host)) {
           const hostInt = ipToInt(host);
           const startInt = ipToInt(startIP);
           const endInt = ipToInt(endIP);
           if (hostInt >= startInt && hostInt <= endInt) return false;
-        } else if (isIPv6(startIP) && isIPv6(endIP) && isIPv6(host)) {
+        } else if (startIP && endIP && isIPv6(startIP) && isIPv6(endIP) && isIPv6(host)) {
           const hostInt = ipv6ToBigInt(host);
           const startInt = ipv6ToBigInt(startIP);
           const endInt = ipv6ToBigInt(endIP);