diff --git a/apiclient/http.py b/apiclient/http.py
index cecf3f2..f713ec8 100644
--- a/apiclient/http.py
+++ b/apiclient/http.py
@@ -177,3 +177,45 @@
               redirections=1,
               connection_type=None):
     return httplib2.Response(self.headers), self.data
+
+
+class HttpMockSequence(object):
+  """Mock of httplib2.Http
+
+  Mocks a sequence of calls to request returning different responses for each
+  call. Create an instance initialized with the desired response headers
+  and content and then use as if an httplib2.Http instance.
+
+    http = HttpMockSequence([
+      ({'status': '401'}, ''),
+      ({'status': '200'}, '{"access_token":"1/3w","expires_in":3600}'),
+      ({'status': '200'}, 'echo_request_headers'),
+      ])
+    resp, content = http.request("http://examples.com")
+
+  There are special values you can pass in for content to trigger
+  behavours that are helpful in testing.
+
+  'echo_request_headers' means return the request headers in the response body
+  'echo_request_body' means return the request body in the response body
+  """
+
+  def __init__(self, iterable):
+    """
+    Args:
+      iterable: iterable, a sequence of pairs of (headers, body)
+    """
+    self._iterable = iterable
+
+  def request(self, uri,
+              method='GET',
+              body=None,
+              headers=None,
+              redirections=1,
+              connection_type=None):
+    resp, content = self._iterable.pop(0)
+    if content == 'echo_request_headers':
+      content = headers
+    elif content == 'echo_request_body':
+      content = body
+    return httplib2.Response(resp), content