refactor: HttpUtils改为单例INSTANCE

par-core/src/main/java/com/par/core/adapter/GroovyScriptEngine.java

@@ -71,7 +71,7 @@ public class GroovyScriptEngine {
             binding.setVariable("jsoup", new JsoupHelper());
             binding.setVariable("json", objectMapper);
             binding.setVariable("utils", new ScriptUtils());
-            binding.setVariable("http", new HttpUtils());
+            binding.setVariable("http", HttpUtils.INSTANCE);
 
             GroovyShell shell = new GroovyShell(classLoader, binding);
             String fullScript = SCRIPT_PREFIX + groovyScript + "\n// PAR 调用入口\nreturn parse(content, url)";

par-core/src/main/java/com/par/core/adapter/HttpUtils.java

@@ -13,6 +13,8 @@ import java.time.Duration;
  */
 public class HttpUtils {
 
+    public static final HttpUtils INSTANCE = new HttpUtils();
+
     private static final HttpClient client = HttpClient.newBuilder()
             .connectTimeout(Duration.ofSeconds(10))
             .followRedirects(HttpClient.Redirect.NORMAL)