[DEVX-5243] Add last_request and last_response to http client. (#384)

* [DEVX-5243] Add last_request and last_response to http client.

* [DEVX-5243] Adding tests for lastRequest and lastResponse.

* [DEVX-5243] Update variables to be private.

* [DEVX-5243] Move setting lastRequest to before request is made to facilitate debugging.

src/main/java/com/twilio/http/HttpClient.java

@@ -12,6 +12,9 @@ public abstract class HttpClient {
     public static final int RETRIES = 3;
     public static final long DELAY_MILLIS = 100L;
 
+    private Response lastResponse;
+    private Request lastRequest;
+
     /**
      * Make a request.
      *
@@ -33,12 +36,13 @@ public Response reliableRequest(final Request request) {
      */
     public Response reliableRequest(final Request request, final int[] retryCodes, int retries,
                                     final long delayMillis) {
+        lastRequest = request;
         Response response = null;
         while (retries > 0) {
             response = makeRequest(request);
 
             if (!shouldRetry(response, retryCodes)) {
-                return response;
+                break;
             }
 
             try {
@@ -50,9 +54,20 @@ public Response reliableRequest(final Request request, final int[] retryCodes, i
             // Decrement retries
             retries--;
         }
+
+        lastResponse = response;
+
         return response;
     }
 
+    public Response getLastResponse() {
+        return lastResponse;
+    }
+
+    public Request getLastRequest() {
+        return lastRequest;
+    }
+
     protected boolean shouldRetry(final Response response, final int[] retryCodes) {
         if (response == null) {
             return true;

src/test/java/com/twilio/http/NetworkHttpClientTest.java

@@ -21,6 +21,7 @@
 import java.util.Collection;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.fail;
 
 public class NetworkHttpClientTest {
@@ -171,6 +172,8 @@ public void testReliableRequest() {
         }};
 
         httpClient.reliableRequest(request);
+        assertNotNull(httpClient.getLastRequest());
+        assertNotNull(httpClient.getLastResponse());
     }
 
     @Test