不对回环地址应用代理 (#4338)

HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/NetworkUtils.java

@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.util.io;
 
 import org.jackhuang.hmcl.util.Pair;
+import org.jackhuang.hmcl.util.StringUtils;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.*;
@@ -45,6 +46,19 @@ public final class NetworkUtils {
     private NetworkUtils() {
     }
 
+    public static boolean isLoopbackAddress(URI uri) {
+        String host = uri.getHost();
+        if (StringUtils.isBlank(host))
+            return false;
+
+        try {
+            InetAddress addr = InetAddress.getByName(host);
+            return addr.isLoopbackAddress();
+        } catch (UnknownHostException e) {
+            return false;
+        }
+    }
+
     public static boolean isHttpUri(URI uri) {
         return "http".equals(uri.getScheme()) || "https".equals(uri.getScheme());
     }