3 files changed, 55 insertions, 1 deletions
diff --git a/pygithub3/services/base.py b/pygithub3/services/base.py
index 1f5d07e..21b22eb 100644
--- a/pygithub3/services/base.py
+++ b/pygithub3/services/base.py
@@ -87,3 +87,30 @@ class Service(object):
 
     def _get_result(self, request, **kwargs):
         return Result(self._client, request, **kwargs)
+
+
+class MimeTypeMixin(object):
+
+    VERSION = 'beta'
+
+    def __set_mimetype(self, mimetype):
+        self.mimetype = 'application/vnd.github.%s.%s+json' % (
+            self.VERSION, mimetype)
+
+    def set_raw_mimetype(self):
+        self.__set_mimetype('raw')
+
+    def set_text_mimetype(self):
+        self.__set_mimetype('text')
+
+    def set_html_mimetype(self):
+        self.__set_mimetype('html')
+
+    def set_full_mimetype(self):
+        self.__set_mimetype('full')
+
+    def _get_mimetype_as_header(self):
+        try:
+            return {'headers': {'Accept': self.mimetype}}
+        except AttributeError:
+            return {}
diff --git a/pygithub3/tests/services/test_core.py b/pygithub3/tests/services/test_core.py
index 007f94f..612b5ea 100644
--- a/pygithub3/tests/services/test_core.py
+++ b/pygithub3/tests/services/test_core.py
@@ -53,3 +53,24 @@ class TestServiceCalls(TestCase):
         result = self.s._get_result(self.r, **self.args)
         self.assertFalse(request_method.called)
         self.assertIsInstance(result, Result)
+
+
+@patch.object(requests.sessions.Session, 'request')
+class TestMimeType(TestCase):
+
+    def setUp(self):
+        self.ms = DummyService()
+
+    def test_WITHOUT_mimetype(self, request_method):
+        request_method.return_value = mock_response()
+        self.ms.dummy_request()
+        request_method.assert_called_with('get', _('dummyrequest'), params={})
+
+    def test_WITH_mimetype(self, request_method):
+        request_method.return_value = mock_response()
+        self.ms.set_html_mimetype()
+        self.ms.dummy_request()
+        request_method.assert_called_with('get', _('dummyrequest'),
+            headers={'Accept': 'application/vnd.github.%s.html+json' %
+                                MimeTypeMixin.VERSION},
+            params={})
diff --git a/pygithub3/tests/utils/services.py b/pygithub3/tests/utils/services.py
index f4765b5..8670f31 100644
--- a/pygithub3/tests/utils/services.py
+++ b/pygithub3/tests/utils/services.py
@@ -1,10 +1,16 @@
 #!/usr/bin/env python
 # -*- encoding: utf-8 -*-
 
-from .base import mock_json
+from pygithub3.services.base import Service, MimeTypeMixin
+from .base import DummyRequest
 
 base_url = 'https://api.github.com/'
 
 
 def _(request):
     return "%s%s" % (base_url, request)
+
+class DummyService(Service, MimeTypeMixin):
+
+    def dummy_request(self):
+        self._get(DummyRequest(), **self._get_mimetype_as_header())