more http resp msg in ex (#1326)

Author: tg123

src/KubernetesClient/Kubernetes.cs

@@ -163,7 +163,6 @@ protected virtual async Task<HttpResponseMessage> SendRequestRaw(string requestC
             if (!httpResponse.IsSuccessStatusCode)
             {
                 string responseContent = null;
-                var ex = new HttpOperationException(string.Format("Operation returned an invalid status code '{0}'", statusCode));
                 if (httpResponse.Content != null)
                 {
                     responseContent = await httpResponse.Content.ReadAsStringAsync().ConfigureAwait(false);
@@ -173,6 +172,7 @@ protected virtual async Task<HttpResponseMessage> SendRequestRaw(string requestC
                     responseContent = string.Empty;
                 }
 
+                var ex = new HttpOperationException($"Operation returned an invalid status code '{statusCode}', response body {responseContent}");
                 ex.Request = new HttpRequestMessageWrapper(httpRequest, requestContent);
                 ex.Response = new HttpResponseMessageWrapper(httpResponse, responseContent);
                 httpRequest.Dispose();