diff --git a/README.md b/README.md
index b97b603..09deabb 100644
--- a/README.md
+++ b/README.md
@@ -27,8 +27,10 @@ The plugin required the following environment variables but also supported `.env
 | OIDC_GROUP_DETECTION_PLUGIN | OIDC plugin to detect groups |
 | OIDC_PROVIDER_DISPLAY_NAME | any text to display |
 | OIDC_SCOPE | OIDC scope |
+| OIDC_GROUPS_ATTRIBUTE | If the group name field in userinfo is not `groups`, specify its json key |
 | OIDC_GROUP_NAME | User group name to be allowed login to MLFlow, currently supported groups in OIDC claims and Microsoft Entra ID groups |
 | OIDC_ADMIN_GROUP_NAME | User group name to be allowed login to MLFlow manage and define permissions, currently supported groups in OIDC claims and Microsoft Entra ID groups |
+| OIDC_ALLOW_ALL_USERS | Allow all users to log in, even if they are not in OIDC_ADMIN_GROUP_NAME and OIDC_GROUP_NAME |
 | OIDC_AUTHORIZATION_URL | OIDC Auth URL (if discovery URL is not defined) |
 | OIDC_TOKEN_URL         | OIDC Token URL (if discovery URL is not defined) |
 | OIDC_USER_URL          | OIDC User info URL (if discovery URL is not defined) |
@@ -81,6 +83,8 @@ OIDC_ADMIN_GROUP_NAME = "mlflow_admins_group_name"
 
 > please note, that for getting group membership information, the application should have "GroupMember.Read.All" permission
 
+> Please note that for some OAuth2 providers like GitLab, use spaces instead of commas to separate scopes. If there is a scope-related error, please confirm the string format.
+
 # Development
 
 Preconditions:
diff --git a/mlflow_oidc_auth/config.py b/mlflow_oidc_auth/config.py
index bf8f135..691d215 100644
--- a/mlflow_oidc_auth/config.py
+++ b/mlflow_oidc_auth/config.py
@@ -1,11 +1,11 @@
 import os
 import secrets
-import requests
 import secrets
 import importlib
 
 from dotenv import load_dotenv
 from mlflow.server import app
+from mlflow_oidc_auth.string_utils import strtobool
 
 load_dotenv()  # take environment variables from .env.
 app.logger.setLevel(os.environ.get("LOG_LEVEL", "INFO"))
@@ -25,6 +25,7 @@ def __init__(self):
         self.OIDC_REDIRECT_URI = os.environ.get("OIDC_REDIRECT_URI", None)
         self.OIDC_CLIENT_ID = os.environ.get("OIDC_CLIENT_ID", None)
         self.OIDC_CLIENT_SECRET = os.environ.get("OIDC_CLIENT_SECRET", None)
+        self.OIDC_ALLOW_ALL_USERS  =  bool(strtobool(os.environ.get("OIDC_ALLOW_ALL_USERS", "False")))
 
         # session
         self.SESSION_TYPE = os.environ.get("SESSION_TYPE", "cachelib")
diff --git a/mlflow_oidc_auth/string_utils.py b/mlflow_oidc_auth/string_utils.py
new file mode 100644
index 0000000..ea8bfab
--- /dev/null
+++ b/mlflow_oidc_auth/string_utils.py
@@ -0,0 +1,13 @@
+def strtobool(val):
+    """Convert a string representation of truth to true (1) or false (0).
+    True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
+    are 'n', 'no', 'f', 'false', 'off', and '0'.  Raises ValueError if
+    'val' is anything else.
+    """
+    val = val.lower()
+    if val in ('y', 'yes', 't', 'true', 'on', '1'):
+        return 1
+    elif val in ('n', 'no', 'f', 'false', 'off', '0'):
+        return 0
+    else:
+        raise ValueError("invalid truth value %r" % (val,))
\ No newline at end of file
diff --git a/mlflow_oidc_auth/views/authentication.py b/mlflow_oidc_auth/views/authentication.py
index 08ab3c0..2997c3b 100644
--- a/mlflow_oidc_auth/views/authentication.py
+++ b/mlflow_oidc_auth/views/authentication.py
@@ -44,14 +44,19 @@ def callback():
             token["access_token"]
         )
     else:
-        user_groups = token["userinfo"][config.OIDC_GROUPS_ATTRIBUTE]
+        try:
+            user_groups = token["userinfo"][config.OIDC_GROUPS_ATTRIBUTE]
+        except KeyError:
+            user_groups = []
 
     app.logger.debug(f"User groups: {user_groups}")
+    app.logger.debug(f"OIDC_ALLOW_ALL_USERS:{config.OIDC_ALLOW_ALL_USERS}")
 
     if config.OIDC_ADMIN_GROUP_NAME in user_groups:
         is_admin = True
-    elif not any(group in user_groups for group in config.OIDC_GROUP_NAME):
-        return "User is not allowed to login", 401
+    elif not config.OIDC_ALLOW_ALL_USERS:
+        if not any(group in user_groups for group in config.OIDC_GROUP_NAME):
+            return "The user is not in any group that is allowed to access, so login is not allowed.", 401
 
     create_user(username=email.lower(), display_name=display_name, is_admin=is_admin)
     populate_groups(group_names=user_groups)
diff --git a/scripts/init-dev-env.sh b/scripts/init-dev-env.sh
new file mode 100755
index 0000000..87ab9c9
--- /dev/null
+++ b/scripts/init-dev-env.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# Script to initialize/reset the development environment
+
+# Remove auth database
+if [ -f "auth.db" ]; then
+    rm auth.db
+    echo "Removed auth.db"
+fi
+
+# Remove Flask session cache
+if [ -d "/tmp/flask_session" ]; then
+    rm -rf /tmp/flask_session/*
+    echo "Cleared /tmp/flask_session"
+fi
+
+# Remove Flask session cache
+if [ -d "/tmp/flask_cache/" ]; then
+    rm -rf /tmp/flask_cache/*
+    echo "Cleared /tmp/flask_cache/"
+fi
+
+# Remove MLflow runs
+if [ -d "mlruns" ]; then
+    rm -rf mlruns
+    echo "Removed mlruns directory"
+fi
+
+# Optional: Recreate necessary directories
+mkdir -p /tmp/flask_session
+mkdir -p /tmp/flask_cache/
+
+echo "Environment initialization complete."
\ No newline at end of file
diff --git a/web-ui/src/styles.scss b/web-ui/src/styles.scss
index f222408..4b2aadb 100644
--- a/web-ui/src/styles.scss
+++ b/web-ui/src/styles.scss
@@ -4,4 +4,4 @@ html, body { height: 100%; }
 body { margin: 0; font-family: Roboto, "Helvetica Neue", sans-serif; }
 
 /* Importing Bootstrap SCSS file. */
-@import '~bootstrap/scss/bootstrap';
+@import 'bootstrap/scss/bootstrap';