diff --git a/apypie/api.py b/apypie/api.py
index 9722099..d5c506f 100644
--- a/apypie/api.py
+++ b/apypie/api.py
@@ -48,6 +48,7 @@ class Api(object):
     :param apidoc_cache_dir: where to cache the JSON description of the API. Defaults to `apidoc_cache_base_dir/<URI>`.
     :param apidoc_cache_name: name of the cache file. If there is cache in the `apidoc_cache_dir`, it is used. Defaults to `default`.
     :param verify_ssl: should the SSL certificate be verified. Defaults to `True`.
+    :param session: a `requests.Session` compatible object. Defaults to `requests.Session()`.
 
     Usage::
 
@@ -72,7 +73,7 @@ def __init__(self, **kwargs):
         self.apidoc_cache_dir = kwargs.get('apidoc_cache_dir', apidoc_cache_dir_default)
         self.apidoc_cache_name = kwargs.get('apidoc_cache_name', self._find_cache_name())
 
-        self._session = requests.Session()
+        self._session = kwargs.get('session') or requests.Session()
         self._session.verify = kwargs.get('verify_ssl', True)
 
         self._session.headers['Accept'] = 'application/json;version={}'.format(self.api_version)
diff --git a/tests/test_apypie.py b/tests/test_apypie.py
index cc25f88..4d2cdf8 100644
--- a/tests/test_apypie.py
+++ b/tests/test_apypie.py
@@ -2,6 +2,7 @@
 import pytest
 
 import apypie
+import requests
 import json
 
 
@@ -314,3 +315,15 @@ def test_validate_cache_path_traversal(fixture_dir, requests_mock, tmp_xdg_cache
     assert tmp_xdg_cache_home.join('apypie', 'https___api.example.com', 'v1', 'default.json').check(exists=0)
     assert api.apidoc
     assert tmp_xdg_cache_home.join('apypie', 'https___api.example.com', 'v1', 'testcache.json').check(file=1)
+
+
+def test_custom_session(fixture_dir, requests_mock, tmpdir):
+    headers = {'X-Apypie-Test': 'Custom'}
+
+    my_session = requests.Session()
+    my_session.headers = headers
+
+    my_api = apypie.Api(uri='https://api.example.com', session=my_session)
+
+    requests_mock.get('https://api.example.com/', request_headers=headers, text='{}')
+    my_api.http_call('get', '/')