对于非.mch.weixin.qq.com结尾的域名，不签名和验签，以便于开发者在其他场景下使用

Author: xy-peng

src/main/java/com/wechat/pay/contrib/apache/httpclient/SignatureExec.java

@@ -55,6 +55,15 @@ protected void convertToRepeatableRequestEntity(HttpUriRequest request) throws I
   @Override
   public CloseableHttpResponse execute(HttpRoute route, HttpRequestWrapper request,
       HttpClientContext context, HttpExecutionAware execAware) throws IOException, HttpException {
+    if (request.getURI().getHost().endsWith(".mch.weixin.qq.com")) {
+      return executeWithSignature(route, request, context, execAware);
+    } else {
+      return mainExec.execute(route, request, context, execAware);
+    }
+  }
+
+  private CloseableHttpResponse executeWithSignature(HttpRoute route, HttpRequestWrapper request,
+      HttpClientContext context, HttpExecutionAware execAware) throws IOException, HttpException {
     HttpUriRequest newRequest = RequestBuilder.copy(request.getOriginal()).build();
     convertToRepeatableRequestEntity(newRequest);
     // 添加认证信息