diff --git a/src/constants.py b/src/constants.py
new file mode 100644
index 00000000..a3b78c48
--- /dev/null
+++ b/src/constants.py
@@ -0,0 +1,4 @@
+REQUEST_TIMEOUT = 100
+CONNECTION_TIMEOUT = 30
+BASE_URL = 'https://graph.microsoft.com/v1.0'
+SDK_VERSION = 'graph-python-0.0.1'
diff --git a/src/core/http_client_factory.py b/src/core/http_client_factory.py
new file mode 100644
index 00000000..552b267b
--- /dev/null
+++ b/src/core/http_client_factory.py
@@ -0,0 +1,45 @@
+from requests import Session
+
+from requests_middleware import MiddlewareHTTPAdapter
+
+from src.constants import BASE_URL, SDK_VERSION
+
+
+class HTTPClientFactory:
+    @classmethod
+    def with_graph_middlewares(cls, middlewares):
+        return _HTTPClient(middlewares=middlewares)
+
+
+class _HTTPClient(Session):
+    def __init__(self, **kwargs):
+        super(_HTTPClient, self).__init__()
+        self.headers.update({'sdkVersion': SDK_VERSION})
+        self._base_url = BASE_URL
+
+        adapter = MiddlewareHTTPAdapter(kwargs.get('middlewares'))
+        self.mount('https://', adapter)
+
+    def get(self, url, **kwargs):
+        request_url = self._get_url(url)
+        super(_HTTPClient, self).get(request_url, **kwargs)
+
+    def post(self, url, data=None, json=None, **kwargs):
+        request_url = self._get_url(url)
+        super(_HTTPClient, self).post(request_url, data=None, json=None, **kwargs)
+
+    def put(self, url, data=None, **kwargs):
+        request_url = self._get_url(url)
+        super(_HTTPClient, self).put(request_url, data=None, **kwargs)
+
+    def patch(self, url, data=None, **kwargs):
+        request_url = self._get_url(url)
+        super(_HTTPClient, self).patch(request_url, data=None, **kwargs)
+
+    def delete(self, url, **kwargs):
+        request_url = self._get_url(url)
+        super(_HTTPClient, self).delete(request_url, **kwargs)
+
+    def _get_url(self, url):
+        return self._base_url+url if (url[0] == '/') else url
+
diff --git a/tests/test.py b/tests/test.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/tests/test_http_client.py b/tests/test_http_client.py
new file mode 100644
index 00000000..e806653e
--- /dev/null
+++ b/tests/test_http_client.py
@@ -0,0 +1,44 @@
+from unittest import TestCase
+
+from requests import Session
+import responses
+
+from src.core.http_client_factory import _HTTPClient
+from src.constants import BASE_URL, SDK_VERSION
+
+
+class HTTPClientTest(TestCase):
+    def setUp(self) -> None:
+        self.requests = _HTTPClient()
+
+    def tearDown(self) -> None:
+        self.requests = None
+
+    def test_creates_instance_of_session(self):
+        self.assertIsInstance(self.requests, Session)
+
+    def test_has_graph_url_as_base_url(self):
+        self.assertEqual(self.requests._base_url, BASE_URL)
+
+    def test_has_sdk_version_header(self):
+        self.assertEqual(self.requests.headers.get('sdkVersion'), SDK_VERSION)
+
+    @responses.activate
+    def test_builds_graph_urls(self):
+        graph_url = BASE_URL+'/me'
+        responses.add(responses.GET, graph_url, status=200)
+
+        self.requests.get('/me')
+        request_url = responses.calls[0].request.url
+
+        self.assertEqual(graph_url, request_url)
+
+    @responses.activate
+    def test_does_not_build_graph_urls_for_full_urls(self):
+        other_url = 'https://microsoft.com/'
+        responses.add(responses.GET, other_url, status=200)
+
+        self.requests.get(other_url)
+        request_url = responses.calls[0].request.url
+
+        self.assertEqual(other_url, request_url)
diff --git a/tests/test_http_client_factory.py b/tests/test_http_client_factory.py
new file mode 100644
index 00000000..95488256
--- /dev/null
+++ b/tests/test_http_client_factory.py
@@ -0,0 +1,24 @@
+from unittest import TestCase
+
+from requests_middleware import BaseMiddleware, MiddlewareHTTPAdapter
+
+from src.core.http_client_factory import HTTPClientFactory
+
+
+class HTTPClientFactoryTest(TestCase):
+    def test_initialized_with_middlewares(self):
+        middlewares = [
+            BaseMiddleware()
+        ]
+
+        requests = HTTPClientFactory.with_graph_middlewares(middlewares)
+        mocked_middleware = requests.get_adapter('https://')
+
+        self.assertIsInstance(mocked_middleware, MiddlewareHTTPAdapter)
+
+    def test_created_with_authentication_provider(self):
+        """
+        TODO: Implement create with authentication provider
+        :return:
+        """
+        pass