fix: get response bytes error

Author: YongwuHe

arex-instrumentation/httpclient/arex-httpclient-ning/src/main/java/io/arex/inst/httpclient/ning/NingHttpClientAdapter.java

@@ -77,14 +77,13 @@ public HttpResponseWrapper wrap(Object response) {
             if (response instanceof Response) {
                 Response tempResponse = (Response) response;
                 httpResponseWrapper.setStatusLine(tempResponse.getStatusText());
-                httpResponseWrapper.setContent(tempResponse.getResponseBodyAsBytes());
+                httpResponseWrapper.setContent(getBytesFromString(tempResponse.getResponseBody()));
                 httpResponseWrapper.setHeaders(buildHeaders(tempResponse.getHeaders()));
                 httpResponseWrapper.setStatusCode(tempResponse.getStatusCode());
                 return httpResponseWrapper;
             }
             String responseString = Serializer.serialize(response);
-            httpResponseWrapper.setContent(StringUtil.isEmpty(responseString) ?
-                    ZERO_BYTE : responseString.getBytes(StandardCharsets.UTF_8));
+            httpResponseWrapper.setContent(getBytesFromString(responseString));
             httpResponseWrapper.setTypeName(TypeUtil.getName(response));
             return httpResponseWrapper;
         } catch (Exception e) {
@@ -93,6 +92,11 @@ public HttpResponseWrapper wrap(Object response) {
         }
     }
 
+    private byte[] getBytesFromString(String responseBody) {
+        return StringUtil.isEmpty(responseBody) ?
+                ZERO_BYTE : responseBody.getBytes(StandardCharsets.UTF_8);
+    }
+
     private List<HttpResponseWrapper.StringTuple> buildHeaders(FluentCaseInsensitiveStringsMap headers) {
         List<HttpResponseWrapper.StringTuple> headerList = new ArrayList<>(headers.size());
         for (Map.Entry<String, List<String>> entry : headers.entrySet()) {

arex-instrumentation/httpclient/arex-httpclient-ning/src/test/java/io/arex/inst/httpclient/ning/NingHttpClientAdapterTest.java

@@ -96,7 +96,7 @@ void getUri() {
     void wrap() throws IOException {
         Response response = mock(Response.class);
         when(response.getStatusText()).thenReturn("OK");
-        when(response.getResponseBodyAsBytes()).thenReturn("test".getBytes());
+        when(response.getResponseBody()).thenReturn("test");
         when(response.getStatusCode()).thenReturn(200);
         FluentCaseInsensitiveStringsMap map = new FluentCaseInsensitiveStringsMap();
         map.add("key", "value1");