nit

Author: shrutiburman

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

@@ -107,7 +107,7 @@ public Response makeRequest(Request request) {
 
         HttpMethod method = request.getMethod();
         if (method == HttpMethod.POST) {
-            if(request.getContentType() != null && request.getContentType().equals("APPLICATION_JSON")){
+            if(request.getContentType() != null && request.getContentType().equals("application/json")){
                 HttpEntity entity = new StringEntity(request.encodeFormBody(), ContentType.APPLICATION_JSON);
                 builder.setEntity(entity);
                 builder.addHeader(HttpHeaders.CONTENT_TYPE, request.getContentType());

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

@@ -58,12 +58,12 @@ private void testContentType(final HttpMethod httpMethod) throws Exception {
         final HttpUrl url = server.url(path);
         final ValidationClient client = new ValidationClient("dummy-sid1", "dummy-sid2", "dummy-signing-key", keyPair.getPrivate());
         final Request request = new Request(httpMethod, url.url().toString());
-        request.setContentType("APPLICATION_JSON");
+        request.setContentType("application/json");
         final Response response = client.makeRequest(request);
         assertEquals(200, response.getStatusCode());
         final RecordedRequest recordedRequest = server.takeRequest();
         assertEquals(httpMethod.name(), recordedRequest.getMethod());
-        assertEquals("APPLICATION_JSON", recordedRequest.getHeader("Content-Type"));
+        assertEquals("application/json", recordedRequest.getHeader("Content-Type"));
         final String validationHeaderValue = recordedRequest.getHeader("Twilio-Client-Validation");
         assertNotNull(validationHeaderValue);
         assertTrue(validationHeaderValue.length() > 0);