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diff --git a/examples/objective-c/auth_sample/MakeRPCViewController.m b/examples/objective-c/auth_sample/MakeRPCViewController.m
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+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import "MakeRPCViewController.h"
+
+#import <AuthTestService/AuthSample.pbrpc.h>
+#import <Google/SignIn.h>
+#include <grpc/status.h>
+#import <ProtoRPC/ProtoRPC.h>
+
+NSString * const kTestScope = @"https://www.googleapis.com/auth/xapi.zoo";
+
+static NSString * const kTestHostAddress = @"grpc-test.sandbox.google.com";
+
+// Category for RPC errors to create the descriptions as we want them to appear on our view.
+@interface NSError (AuthSample)
+- (NSString *)UIDescription;
+@end
+
+@implementation NSError (AuthSample)
+- (NSString *)UIDescription {
+  if (self.code == GRPC_STATUS_UNAUTHENTICATED) {
+    // Authentication error. OAuth2 specifies we'll receive a challenge header.
+    // |userInfo[kGRPCStatusMetadataKey]| is the dictionary of response metadata.
+    NSString *challengeHeader = self.userInfo[kGRPCStatusMetadataKey][@"www-authenticate"] ?: @"";
+    return [@"Invalid credentials. Server challenge:\n" stringByAppendingString:challengeHeader];
+  } else {
+    // Any other error.
+    return [NSString stringWithFormat:@"Unexpected RPC error %li: %@",
+            (long)self.code, self.localizedDescription];
+  }
+}
+@end
+
+@implementation MakeRPCViewController
+
+- (void)viewWillAppear:(BOOL)animated {
+
+  // Create a service client and a proto request as usual.
+  AUTHTestService *client = [[AUTHTestService alloc] initWithHost:kTestHostAddress];
+
+  AUTHRequest *request = [AUTHRequest message];
+  request.fillUsername = YES;
+  request.fillOauthScope = YES;
+
+  // Create a not-yet-started RPC. We want to set the request headers on this object before starting
+  // it.
+  ProtoRPC *call =
+      [client RPCToUnaryCallWithRequest:request handler:^(AUTHResponse *response, NSError *error) {
+        if (response) {
+          // This test server responds with the email and scope of the access token it receives.
+          self.mainLabel.text = [NSString stringWithFormat:@"Used scope: %@ on behalf of user %@",
+                                 response.oauthScope, response.username];
+
+        } else {
+          self.mainLabel.text = error.UIDescription;
+        }
+      }];
+
+  // Set the access token to be used.
+  NSString *accessToken = GIDSignIn.sharedInstance.currentUser.authentication.accessToken;
+  call.requestMetadata[@"Authorization"] = [@"Bearer " stringByAppendingString:accessToken];
+
+  // Start the RPC.
+  [call start];
+
+  self.mainLabel.text = @"Waiting for RPC to complete...";
+}
+
+@end