diff --git a/flask_authz/casbin_enforcer.py b/flask_authz/casbin_enforcer.py
index d874471..59841fa 100644
--- a/flask_authz/casbin_enforcer.py
+++ b/flask_authz/casbin_enforcer.py
@@ -59,7 +59,7 @@ def owner_loader(self, callback):
         self._owner_loader = callback
         return callback
 
-    def enforcer(self, func):
+    def enforcer(self, func, delimiter=','):
         @wraps(func)
         def wrapper(*args, **kwargs):
             if self.e.watcher and self.e.watcher.should_reload():
@@ -117,7 +117,8 @@ def wrapper(*args, **kwargs):
                         # Split header by ',' in case of groups when groups are
                         # sent "group1,group2,group3,..." in the header
                         for owner in self.sanitize_group_headers(
-                            request.headers.get(header)
+                            request.headers.get(header),
+                            delimiter
                         ):
                             self.app.logger.debug(
                                 "Enforce against owner: %s header: %s"
@@ -149,26 +150,19 @@ def wrapper(*args, **kwargs):
         return wrapper
 
     @staticmethod
-    def sanitize_group_headers(headers_str):
+    def sanitize_group_headers(headers_str, delimiter=',') -> list:
         """
         Sanitizes group header string so that it is easily parsable by enforcer
         removes extra spaces, and converts comma delimited or white space
         delimited list into a list.
+
+        Default delimiter: "," (comma)
+
         Returns:
-            str
+            list
         """
-        # If there are commas and white space in the string,
-        # remove the whitespace
-        if " " in headers_str and "," in headers_str:
-            headers_str = headers_str.replace(" ", "")
-        # If there are no commas in the string, return a list
-        # delimited by whitespace
-        if " " in headers_str and "," not in headers_str:
-            return headers_str.split(" ")
-        # There are commas and no whitespace in the string, return a list
-        # delimited by commas
-        else:
-            return headers_str.split(",")
+
+        return [string.strip() for string in headers_str.split(delimiter) if string != ""]
 
     def manager(self, func):
         """Get the Casbin Enforcer Object to manager Casbin"""
diff --git a/tests/test_casbin_enforcer.py b/tests/test_casbin_enforcer.py
index 4449d9f..12aa420 100644
--- a/tests/test_casbin_enforcer.py
+++ b/tests/test_casbin_enforcer.py
@@ -59,7 +59,7 @@ def update_callback(self):
         ("X-Idp-Groups", "admin", "GET", 401, "X-User"),
         ("X-Idp-Groups", "users", "GET", 200, None),
         ("X-Idp-Groups", "noexist,testnoexist,users", "GET", 200, None),
-        ("X-Idp-Groups", "noexist testnoexist users", "GET", 200, None),
+        # ("X-Idp-Groups", "noexist testnoexist users", "GET", 200, None),
         ("X-Idp-Groups", "noexist, testnoexist, users", "GET", 200, None),
         ("Authorization", "Basic Ym9iOnBhc3N3b3Jk", "GET", 200, "Authorization"),
         ("Authorization", "Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZGVudGl0eSI6ImJvYiJ9."
@@ -205,3 +205,33 @@ def owner_loader():
     caller = getattr(c, method.lower())
     rv = caller("/item")
     assert rv.status_code == status
+
+
+@pytest.mark.parametrize(
+    "header_string, expected_list",
+    [
+        ("noexist,testnoexist,users  ", ["noexist", "testnoexist", "users"]),
+        ("noexist,   testnoexist,   users", ["noexist", "testnoexist", "users"]),
+        ("noexist, testnoexist, users", ["noexist", "testnoexist", "users"]),
+        ("somegroup, group with space", ["somegroup", "group with space"]),
+        ("group with space", ["group with space"])
+    ]
+)
+def test_sanitize_group_headers(header_string, expected_list):
+    header_list = CasbinEnforcer.sanitize_group_headers(header_string)
+    assert header_list == expected_list
+
+
+@pytest.mark.parametrize(
+    "header_string, expected_list",
+    [
+        ("noexist testnoexist users  ", ["noexist", "testnoexist", "users"]),
+        ("noexist   testnoexist   users", ["noexist", "testnoexist", "users"]),
+        ("noexist, testnoexist, users", ["noexist,", "testnoexist,", "users"]),
+        ("somegroup, group with space", ["somegroup,", "group", "with", "space"]),
+        ("group with space", ["group", "with", "space"])
+    ]
+)
+def test_sanitize_group_headers_with_whitespace(header_string, expected_list):
+    header_list = CasbinEnforcer.sanitize_group_headers(header_string, ' ')
+    assert header_list == expected_list
diff --git a/tests/test_casbin_enforcer_init_app.py b/tests/test_casbin_enforcer_init_app.py
index 321f2c9..a496616 100644
--- a/tests/test_casbin_enforcer_init_app.py
+++ b/tests/test_casbin_enforcer_init_app.py
@@ -65,7 +65,7 @@ def update_callback(self):
         ("X-Idp-Groups", "admin", "GET", 401, "X-User"),
         ("X-Idp-Groups", "users", "GET", 200, None),
         ("X-Idp-Groups", "noexist,testnoexist,users", "GET", 200, None),
-        ("X-Idp-Groups", "noexist testnoexist users", "GET", 200, None),
+        # ("X-Idp-Groups", "noexist testnoexist users", "GET", 200, None),
         ("X-Idp-Groups", "noexist, testnoexist, users", "GET", 200, None),
         ("Authorization", "Basic Ym9iOnBhc3N3b3Jk", "GET", 200, "Authorization"),
         ("Authorization", "Unsupported Ym9iOnBhc3N3b3Jk", "GET", 401, None),