binarywang
diff --git a/...ava-pay/src/main/java/com/github/binarywang/wxpay/config/HttpClientBuilderCustomizer.java b/...ava-pay/src/main/java/com/github/binarywang/wxpay/config/HttpClientBuilderCustomizer.java
@@ -0,0 +1,11 @@
+package com.github.binarywang.wxpay.config;
+
+import org.apache.http.impl.client.HttpClientBuilder;
+
+/**
+ * @author <a href="https://github.com/ifcute">dagewang</a>
+ */
+@FunctionalInterface
+public interface HttpClientBuilderCustomizer {
+  void customize(HttpClientBuilder var1);
+}
diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java
@@ -27,6 +27,7 @@
 import java.security.PrivateKey;
 import java.security.cert.X509Certificate;
 import java.util.Base64;
+import java.util.Optional;
 
 /**
  * 微信支付配置
@@ -165,6 +166,11 @@ public class WxPayConfig {
 
 
   private CloseableHttpClient apiV3HttpClient;
+  /**
+   * 支持扩展httpClientBuilder
+   */
+  private HttpClientBuilderCustomizer httpClientBuilderCustomizer;
+  private HttpClientBuilderCustomizer apiV3HttpClientBuilderCustomizer;
   /**
    * 私钥信息
    */
@@ -283,6 +289,10 @@ public CloseableHttpClient initApiV3HttpClient() throws WxPayException {
       //初始化V3接口正向代理设置
       HttpProxyUtils.initHttpProxy(wxPayV3HttpClientBuilder, wxPayHttpProxy);
 
+      // 提供自定义wxPayV3HttpClientBuilder的能力
+      Optional.ofNullable(apiV3HttpClientBuilderCustomizer).ifPresent(e -> {
+        e.customize(wxPayV3HttpClientBuilder);
+      });
       CloseableHttpClient httpClient = wxPayV3HttpClientBuilder.build();
 
       this.apiV3HttpClient = httpClient;

diff --git a/...ay/src/main/java/com/github/binarywang/wxpay/service/impl/WxPayServiceApacheHttpImpl.java b/...ay/src/main/java/com/github/binarywang/wxpay/service/impl/WxPayServiceApacheHttpImpl.java
@@ -28,6 +28,7 @@
 import java.nio.charset.StandardCharsets;
 import java.util.Base64;
 import java.util.Objects;
+import java.util.Optional;
 
 /**
  * <pre>
@@ -335,6 +336,12 @@ private HttpClientBuilder createHttpClientBuilder(boolean useKey) throws WxPayEx
       httpClientBuilder.setDefaultCredentialsProvider(provider)
         .setProxy(new HttpHost(this.getConfig().getHttpProxyHost(), this.getConfig().getHttpProxyPort()));
     }
+
+    // 提供自定义httpClientBuilder的能力
+    Optional.ofNullable(getConfig().getHttpClientBuilderCustomizer()).ifPresent(e -> {
+      e.customize(httpClientBuilder);
+    });
+
     return httpClientBuilder;
   }
 

diff --git a/...-java-pay/src/test/java/com/github/binarywang/wxpay/config/CustomizedWxPayConfigTest.java b/...-java-pay/src/test/java/com/github/binarywang/wxpay/config/CustomizedWxPayConfigTest.java
@@ -0,0 +1,39 @@
+package com.github.binarywang.wxpay.config;
+
+import com.github.binarywang.wxpay.exception.WxPayException;
+import com.github.binarywang.wxpay.service.WxPayService;
+import com.github.binarywang.wxpay.testbase.CustomizedApiTestModule;
+import com.google.inject.Inject;
+import lombok.extern.slf4j.Slf4j;
+import org.testng.annotations.Guice;
+import org.testng.annotations.Test;
+
+/**
+ * @author <a href="https://github.com/ifcute">dagewang</a>
+ */
+@Slf4j
+@Test
+@Guice(modules = CustomizedApiTestModule.class)
+public class CustomizedWxPayConfigTest {
+
+  @Inject
+  private WxPayService wxPayService;
+
+  public void testCustomizerHttpClient() {
+    try {
+      wxPayService.queryOrder("a", null);
+    } catch (WxPayException e) {
+      // ignore
+      e.printStackTrace();
+    }
+  }
+
+  public void testCustomizerV3HttpClient() {
+    try {
+      wxPayService.queryOrderV3("a", null);
+    } catch (WxPayException e) {
+      // ignore
+      e.printStackTrace();
+    }
+  }
+}
diff --git a/...-java-pay/src/test/java/com/github/binarywang/wxpay/testbase/CustomizedApiTestModule.java b/...-java-pay/src/test/java/com/github/binarywang/wxpay/testbase/CustomizedApiTestModule.java
@@ -0,0 +1,61 @@
+package com.github.binarywang.wxpay.testbase;
+
+import com.github.binarywang.wxpay.config.WxPayConfig;
+import com.github.binarywang.wxpay.service.WxPayService;
+import com.github.binarywang.wxpay.service.impl.WxPayServiceImpl;
+import com.google.inject.Binder;
+import com.google.inject.Module;
+import com.thoughtworks.xstream.XStream;
+import me.chanjar.weixin.common.error.WxRuntimeException;
+import me.chanjar.weixin.common.util.xml.XStreamInitializer;
+import org.apache.http.HttpRequestInterceptor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * The type Api test module.
+ */
+public class CustomizedApiTestModule implements Module {
+  private final Logger log = LoggerFactory.getLogger(this.getClass());
+  private static final String TEST_CONFIG_XML = "test-config.xml";
+
+  @Override
+  public void configure(Binder binder) {
+    try (InputStream inputStream = ClassLoader.getSystemResourceAsStream(TEST_CONFIG_XML)) {
+      if (inputStream == null) {
+        throw new WxRuntimeException("测试配置文件【" + TEST_CONFIG_XML + "】未找到，请参照test-config-sample.xml文件生成");
+      }
+
+      XmlWxPayConfig config = this.fromXml(XmlWxPayConfig.class, inputStream);
+      config.setIfSaveApiData(true);
+
+      config.setApiV3HttpClientBuilderCustomizer((builder) -> {
+        builder.addInterceptorLast((HttpRequestInterceptor) (r, c) -> System.out.println("--------> V3 HttpRequestInterceptor ..."));
+      });
+
+      config.setHttpClientBuilderCustomizer((builder) -> {
+        builder.addInterceptorLast((HttpRequestInterceptor) (r, c) -> System.out.println("--------> HttpRequestInterceptor ..."));
+      });
+
+      WxPayService wxService = new WxPayServiceImpl();
+      wxService.setConfig(config);
+
+      binder.bind(WxPayService.class).toInstance(wxService);
+      binder.bind(WxPayConfig.class).toInstance(config);
+    } catch (IOException e) {
+      this.log.error(e.getMessage(), e);
+    }
+  }
+
+  @SuppressWarnings("unchecked")
+  private <T> T fromXml(Class<T> clazz, InputStream is) {
+    XStream xstream = XStreamInitializer.getInstance();
+    xstream.alias("xml", clazz);
+    xstream.processAnnotations(clazz);
+    return (T) xstream.fromXML(is);
+  }
+
+}