diff --git a/keycloak/connection.py b/keycloak/connection.py
index 5e166fc..6f32439 100644
--- a/keycloak/connection.py
+++ b/keycloak/connection.py
@@ -47,10 +47,17 @@ class ConnectionManager(object):
         self._timeout = timeout
         self._verify = verify
         self._s = requests.Session()
+
         # retry once to reset connection with Keycloak after  tomcat's ConnectionTimeout
         # see https://github.com/marcospereirampj/python-keycloak/issues/36
-        self._s.mount('https://', HTTPAdapter(max_retries=1))
-        self._s.mount('http://', HTTPAdapter(max_retries=1))
+        for protocol in ('https://', 'http://'):
+            adapter = HTTPAdapter(max_retries=1)
+            # adds POST to retry whitelist
+            method_whitelist = set(adapter.max_retries.method_whitelist)
+            method_whitelist.add('POST')
+            adapter.max_retries.method_whitelist = frozenset(method_whitelist)
+
+            self._s.mount(protocol, adapter)
 
     @property
     def base_url(self):