diff --git a/setup.cfg b/setup.cfg
index 8955837..efeb0bb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -5,7 +5,7 @@
 
 [metadata]
 name = gypsum-client
-description = Python cline to gypsum
+description = Python client to gypsum REST API
 author = Jayaram Kancherla
 author_email = jayaram.kancherla@gmail.com
 license = MIT
diff --git a/src/gypsum_client/__init__.py b/src/gypsum_client/__init__.py
index 0e086f2..844d099 100644
--- a/src/gypsum_client/__init__.py
+++ b/src/gypsum_client/__init__.py
@@ -17,6 +17,7 @@
 
 
 from .auth import access_token, set_access_token
+from .cache_directory import cache_directory
 from .clone_operations import clone_version
 from .config import REQUESTS_MOD
 from .create_operations import create_project
@@ -36,6 +37,7 @@
 from .refresh_operations import refresh_latest, refresh_usage
 from .remove_operations import remove_asset, remove_project, remove_version
 from .resolve_links import resolve_links
+from .rest_url import rest_url
 from .s3_config import public_s3_config
 from .save_operations import save_file, save_version
 from .search_metadata import define_text_query, search_metadata_text
diff --git a/src/gypsum_client/_utils.py b/src/gypsum_client/_utils.py
index 1ebf6ef..683ef88 100644
--- a/src/gypsum_client/_utils.py
+++ b/src/gypsum_client/_utils.py
@@ -3,8 +3,7 @@
 import re
 import shutil
 import tempfile
-from datetime import datetime, timezone
-from pathlib import Path
+from datetime import datetime
 from typing import Optional
 from urllib.parse import quote_plus
 
@@ -18,40 +17,6 @@
 __license__ = "MIT"
 
 
-def _rest_url(url: Optional[str] = None):
-    current = "https://gypsum.artifactdb.com"
-
-    if url is None:
-        return current
-    else:
-        return url
-
-
-def _cache_directory(dir: Optional[str] = None):
-    current = None
-    if current is None:
-        _from_env = os.environ.get("GYPSUM_CACHE_DIR", None)
-        if _from_env is not None:
-            if not os.path.exists(_from_env):
-                raise FileNotFoundError(
-                    f"Path {_from_env} does not exist or is not accessible."
-                )
-
-            current = _from_env
-        else:
-            current = os.path.join(str(Path.home()), "gypsum", "cache")
-
-            os.makedirs(current, exist_ok=True)
-
-    if dir is None:
-        return current
-    else:
-        if not os.path.exists(dir):
-            raise FileNotFoundError(f"Path {dir} does not exist or is not accessible.")
-
-        return dir
-
-
 def _remove_slash_url(url: str):
     if url.endswith("/"):
         url = url.rstrip("/")
diff --git a/src/gypsum_client/auth.py b/src/gypsum_client/auth.py
index 51481b7..3499f0f 100644
--- a/src/gypsum_client/auth.py
+++ b/src/gypsum_client/auth.py
@@ -6,8 +6,10 @@
 from filelock import FileLock
 
 from ._github import github_access_token
-from ._utils import _cache_directory, _is_interactive, _remove_slash_url, _rest_url
+from ._utils import _is_interactive, _remove_slash_url
+from .cache_directory import cache_directory
 from .config import REQUESTS_MOD
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -23,7 +25,7 @@ def _token_cache_path(cache_dir):
 def access_token(
     full: bool = False,
     request: bool = True,
-    cache_dir: Optional[str] = _cache_directory(),
+    cache_dir: Optional[str] = cache_directory(),
     token_expiration_limit: int = 10,
 ) -> Optional[Union[str, dict]]:
     """Get GitHub access token for authentication to the gypsum API's.
@@ -69,7 +71,6 @@ def _token_func(x):
             TOKEN_CACHE["auth_info"] = None
 
     if cache_dir is not None:
-        cache_dir = _cache_directory(cache_dir)
         cache_path = _token_cache_path(cache_dir)
 
         if os.path.exists(cache_path):
@@ -99,12 +100,12 @@ def _token_func(x):
 
 def set_access_token(
     token: str = TOKEN_AUTO,
-    app_url: str = _rest_url(),
+    app_url: str = rest_url(),
     app_key: Optional[str] = None,
     app_secret: Optional[str] = None,
     github_url: str = "https://api.github.com",
     user_agent: Optional[str] = None,
-    cache_dir: Optional[str] = _cache_directory(),
+    cache_dir: Optional[str] = cache_directory(),
 ) -> dict:
     """Set GitHub access token for authentication to the gypsum API's.
 
@@ -141,7 +142,6 @@ def set_access_token(
 
     cache_path = None
     if cache_dir is not None:
-        cache_dir = _cache_directory(cache_dir)
         cache_path = _token_cache_path(cache_dir)
 
     if token is None:
@@ -211,7 +211,6 @@ def set_access_token(
     if expires_header is not None:
         expiry = float(expires_header.split(" ")[0])
 
-    cache_dir = _cache_directory(cache_dir)
     if cache_dir is not None:
         cache_path = _token_cache_path(cache_dir)
         os.makedirs(os.path.dirname(cache_path), exist_ok=True)
diff --git a/src/gypsum_client/cache_directory.py b/src/gypsum_client/cache_directory.py
new file mode 100644
index 0000000..6d44753
--- /dev/null
+++ b/src/gypsum_client/cache_directory.py
@@ -0,0 +1,52 @@
+import os
+from pathlib import Path
+from typing import Optional
+
+__author__ = "Jayaram Kancherla"
+__copyright__ = "Jayaram Kancherla"
+__license__ = "MIT"
+
+CURRENT_CACHE_DIRECTORY = None
+
+
+def cache_directory(dir: Optional[str] = None):
+    """Cache directory.
+
+    Specify the cache directory in the local filesystem
+    for gypsum-related data.
+
+    If the ``GYPSUM_CACHE_DIR`` environment variable is set
+    before the first call to ``cache_directory()``, it is used
+    as the initial location of the cache directory.
+    Otherwise, the initial location is set to user's home
+    directory defined by ``Path.home()``.
+
+    Args:
+        dir:
+            Path to the cache directory.
+            If `None`, a default cache location is used.
+
+    Returns:
+        Path to the cache directory.
+    """
+    global CURRENT_CACHE_DIRECTORY
+
+    if CURRENT_CACHE_DIRECTORY is None:
+        _from_env = os.environ.get("GYPSUM_CACHE_DIR", None)
+        if _from_env is not None:
+            if not os.path.exists(_from_env):
+                raise FileNotFoundError(
+                    f"Path {_from_env} does not exist or is not accessible."
+                )
+
+            CURRENT_CACHE_DIRECTORY = _from_env
+        else:
+            CURRENT_CACHE_DIRECTORY = os.path.join(str(Path.home()), "gypsum", "cache")
+            os.makedirs(CURRENT_CACHE_DIRECTORY, exist_ok=True)
+
+    if dir is not None:
+        if not os.path.exists(dir):
+            raise FileNotFoundError(f"Path {dir} does not exist or is not accessible.")
+        CURRENT_CACHE_DIRECTORY = dir
+
+    return CURRENT_CACHE_DIRECTORY
diff --git a/src/gypsum_client/clone_operations.py b/src/gypsum_client/clone_operations.py
index 9b36afc..0dff5e7 100644
--- a/src/gypsum_client/clone_operations.py
+++ b/src/gypsum_client/clone_operations.py
@@ -42,8 +42,10 @@
 import os
 import shutil
 
-from ._utils import BUCKET_CACHE_NAME, _cache_directory, _rest_url
+from ._utils import BUCKET_CACHE_NAME
+from .cache_directory import cache_directory
 from .fetch_operations import fetch_manifest
+from .rest_url import rest_url
 from .save_operations import save_version
 
 __author__ = "Jayaram Kancherla"
@@ -57,8 +59,8 @@ def clone_version(
     version: str,
     destination: str,
     download: bool = True,
-    cache_dir: str = _cache_directory(),
-    url: str = _rest_url(),
+    cache_dir: str = cache_directory(),
+    url: str = rest_url(),
     **kwargs,
 ):
     """Clone a version's directory structure.
@@ -112,8 +114,6 @@ def clone_version(
 
             Only used if ``download`` is `True`.
     """
-    cache_dir = _cache_directory(cache_dir)
-
     if download:
         save_version(project, asset, version, cache_dir=cache_dir, url=url, **kwargs)
 
diff --git a/src/gypsum_client/create_operations.py b/src/gypsum_client/create_operations.py
index 5964896..ca2947b 100644
--- a/src/gypsum_client/create_operations.py
+++ b/src/gypsum_client/create_operations.py
@@ -3,9 +3,10 @@
 
 import requests
 
-from ._utils import _remove_slash_url, _rest_url, _sanitize_uploaders
+from ._utils import _remove_slash_url, _sanitize_uploaders
 from .auth import access_token
 from .config import REQUESTS_MOD
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -19,7 +20,7 @@ def create_project(
     baseline: int = None,
     growth_rate: int = None,
     year: int = None,
-    url: str = _rest_url(),
+    url: str = rest_url(),
     token: str = None,
 ):
     """Create a new project with the associated permissions.
diff --git a/src/gypsum_client/fetch_metadata_database.py b/src/gypsum_client/fetch_metadata_database.py
index 8b92946..0f3c742 100644
--- a/src/gypsum_client/fetch_metadata_database.py
+++ b/src/gypsum_client/fetch_metadata_database.py
@@ -14,7 +14,8 @@
 import requests
 from filelock import FileLock
 
-from ._utils import _cache_directory, _download_and_rename_file
+from ._utils import _download_and_rename_file
+from .cache_directory import cache_directory
 from .config import REQUESTS_MOD
 
 __author__ = "Jayaram Kancherla"
@@ -71,7 +72,7 @@ def fetch_metadata_database(
     if cache_dir is None:
         cache_path = tempfile.NamedTemporaryFile(suffix=".sqlite3").name
     else:
-        cache_dir = os.path.join(_cache_directory(cache_dir), "databases")
+        cache_dir = os.path.join(cache_directory(cache_dir), "databases")
 
         cache_path = os.path.join(cache_dir, name)
         if not os.path.exists(cache_path):
diff --git a/src/gypsum_client/fetch_metadata_schema.py b/src/gypsum_client/fetch_metadata_schema.py
index d3db0d4..9c07c60 100644
--- a/src/gypsum_client/fetch_metadata_schema.py
+++ b/src/gypsum_client/fetch_metadata_schema.py
@@ -4,7 +4,7 @@
 import requests
 from filelock import FileLock
 
-from ._utils import _cache_directory
+from .cache_directory import cache_directory
 from .config import REQUESTS_MOD
 
 __author__ = "Jayaram Kancherla"
@@ -58,7 +58,7 @@ def fetch_metadata_schema(
     if cache_dir is None:
         cache_path = tempfile.mktemp(suffix=".json")
     else:
-        cache_dir = os.path.join(_cache_directory(cache_dir), "schemas")
+        cache_dir = os.path.join(cache_directory(cache_dir), "schemas")
 
         cache_path = os.path.join(cache_dir, name)
         if not os.path.exists(cache_path):
diff --git a/src/gypsum_client/fetch_operations.py b/src/gypsum_client/fetch_operations.py
index fa2f0b4..89873ca 100644
--- a/src/gypsum_client/fetch_operations.py
+++ b/src/gypsum_client/fetch_operations.py
@@ -2,19 +2,19 @@
 
 from ._utils import (
     BUCKET_CACHE_NAME,
-    _cache_directory,
     _cast_datetime,
     _fetch_cacheable_json,
     _fetch_json,
-    _rest_url,
 )
+from .cache_directory import cache_directory
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
 __license__ = "MIT"
 
 
-def fetch_latest(project: str, asset: str, url: str = _rest_url()) -> str:
+def fetch_latest(project: str, asset: str, url: str = rest_url()) -> str:
     """Fetch the latest version of a project's asset.
 
     See Also:
@@ -48,9 +48,9 @@ def fetch_manifest(
     project: str,
     asset: str,
     version: str,
-    cache_dir: str = _cache_directory(),
+    cache_dir: str = cache_directory(),
     overwrite: bool = False,
-    url: str = _rest_url(),
+    url: str = rest_url(),
 ) -> dict:
     """Fetch the manifest for a version of an asset of a project.
 
@@ -102,7 +102,7 @@ def fetch_manifest(
     )
 
 
-def fetch_permissions(project: str, url: str = _rest_url()) -> dict:
+def fetch_permissions(project: str, url: str = rest_url()) -> dict:
     """Fetch the permissions for a project.
 
     See Also:
@@ -153,7 +153,7 @@ def fetch_permissions(project: str, url: str = _rest_url()) -> dict:
     return perms
 
 
-def fetch_quota(project: str, url: str = _rest_url()) -> dict:
+def fetch_quota(project: str, url: str = rest_url()) -> dict:
     """Fetch the quota details for a project.
 
     See Also:
@@ -185,9 +185,9 @@ def fetch_summary(
     project: str,
     asset: str,
     version: str,
-    cache_dir: str = _cache_directory(),
+    cache_dir: str = cache_directory(),
     overwrite: bool = False,
-    url: str = _rest_url(),
+    url: str = rest_url(),
 ) -> dict:
     """Fetch the summary for a version of an asset of a project.
 
@@ -247,7 +247,7 @@ def fetch_summary(
     return _out
 
 
-def fetch_usage(project: str, url: str = _rest_url()) -> int:
+def fetch_usage(project: str, url: str = rest_url()) -> int:
     """Fetch the quota usage for a project.
 
     See Also:
diff --git a/src/gypsum_client/list_operations.py b/src/gypsum_client/list_operations.py
index 39bf325..0dc0f57 100644
--- a/src/gypsum_client/list_operations.py
+++ b/src/gypsum_client/list_operations.py
@@ -1,14 +1,15 @@
 import requests
 
-from ._utils import _list_for_prefix, _rest_url
+from ._utils import _list_for_prefix
 from .config import REQUESTS_MOD
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
 __license__ = "MIT"
 
 
-def list_projects(url: str = _rest_url()) -> list:
+def list_projects(url: str = rest_url()) -> list:
     """List all projects in the gypsum backend.
 
     Example:
@@ -27,7 +28,7 @@ def list_projects(url: str = _rest_url()) -> list:
     return _list_for_prefix(prefix=None, url=url)
 
 
-def list_assets(project: str, url: str = _rest_url()) -> list:
+def list_assets(project: str, url: str = rest_url()) -> list:
     """List all assets in a project.
 
     Example:
@@ -49,7 +50,7 @@ def list_assets(project: str, url: str = _rest_url()) -> list:
     return _list_for_prefix(f"{project}/", url=url)
 
 
-def list_versions(project: str, asset: str, url=_rest_url()) -> list:
+def list_versions(project: str, asset: str, url: str = rest_url()) -> list:
     """List all versions for a project asset.
 
     Example:
@@ -80,7 +81,7 @@ def list_files(
     version: str,
     prefix: str = None,
     include_dot: bool = True,
-    url: str = _rest_url(),
+    url: str = rest_url(),
 ) -> list:
     """List all files for a specified version of a project and asset.
 
diff --git a/src/gypsum_client/prepare_directory_for_upload.py b/src/gypsum_client/prepare_directory_for_upload.py
index fa98486..fd2f8b6 100644
--- a/src/gypsum_client/prepare_directory_for_upload.py
+++ b/src/gypsum_client/prepare_directory_for_upload.py
@@ -59,9 +59,9 @@
 
 from ._utils import (
     BUCKET_CACHE_NAME,
-    _cache_directory,
     _sanitize_path,
 )
+from .cache_directory import cache_directory
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -71,7 +71,7 @@
 def prepare_directory_upload(
     directory: str,
     links: Literal["auto", "always", "never"] = "auto",
-    cache_dir: str = _cache_directory(),
+    cache_dir: str = cache_directory(),
 ) -> dict:
     """Prepare to upload a directory's contents.
 
@@ -111,8 +111,6 @@ def prepare_directory_upload(
             f"Invalid value for 'links': {links}. Must be one of {_links_options}."
         )
 
-    cache_dir = _cache_directory(cache_dir)
-
     out_files = []
     out_links = []
 
diff --git a/src/gypsum_client/probation_operations.py b/src/gypsum_client/probation_operations.py
index b1077f5..057152c 100644
--- a/src/gypsum_client/probation_operations.py
+++ b/src/gypsum_client/probation_operations.py
@@ -4,9 +4,9 @@
 
 from ._utils import (
     _remove_slash_url,
-    _rest_url,
 )
 from .auth import access_token
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -14,7 +14,7 @@
 
 
 def approve_probation(
-    project: str, asset: str, version: str, url: str = _rest_url(), token: str = None
+    project: str, asset: str, version: str, url: str = rest_url(), token: str = None
 ):
     """Approve a probational upload.
 
@@ -81,7 +81,7 @@ def approve_probation(
 
 
 def reject_probation(
-    project: str, asset: str, version: str, url: str = _rest_url(), token: str = None
+    project: str, asset: str, version: str, url: str = rest_url(), token: str = None
 ):
     """Reject a probational upload.
 
diff --git a/src/gypsum_client/refresh_operations.py b/src/gypsum_client/refresh_operations.py
index 6d82e8c..36b5215 100644
--- a/src/gypsum_client/refresh_operations.py
+++ b/src/gypsum_client/refresh_operations.py
@@ -4,9 +4,9 @@
 
 from ._utils import (
     _remove_slash_url,
-    _rest_url,
 )
 from .auth import access_token
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -14,7 +14,7 @@
 
 
 def refresh_latest(
-    project: str, asset: str, url: str = _rest_url(), token: str = None
+    project: str, asset: str, url: str = rest_url(), token: str = None
 ) -> str:
     """Refresh the latest version.
 
@@ -69,7 +69,7 @@ def refresh_latest(
     return req.json()["version"]
 
 
-def refresh_usage(project: str, url: str = _rest_url(), token: str = None) -> int:
+def refresh_usage(project: str, url: str = rest_url(), token: str = None) -> int:
     """Refresh the usage quota of a project.
 
     Recompute the usage of a project.
diff --git a/src/gypsum_client/remove_operations.py b/src/gypsum_client/remove_operations.py
index 4b1c052..62a1096 100644
--- a/src/gypsum_client/remove_operations.py
+++ b/src/gypsum_client/remove_operations.py
@@ -2,15 +2,16 @@
 
 import requests
 
-from ._utils import _remove_slash_url, _rest_url
+from ._utils import _remove_slash_url
 from .auth import access_token
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
 __license__ = "MIT"
 
 
-def remove_asset(project: str, asset: str, url: str = _rest_url(), token: str = None):
+def remove_asset(project: str, asset: str, url: str = rest_url(), token: str = None):
     """Remove an asset of a project from the gypsum backend.
 
     See Also:
@@ -62,7 +63,7 @@ def remove_asset(project: str, asset: str, url: str = _rest_url(), token: str =
     return True
 
 
-def remove_project(project: str, url: str = _rest_url(), token: str = None):
+def remove_project(project: str, url: str = rest_url(), token: str = None):
     """Remove a project from the gypsum backend.
 
     See Also:
@@ -109,11 +110,11 @@ def remove_version(
     project: str,
     asset: str,
     version: str,
-    url: str = _rest_url(),
+    url: str = rest_url(),
     token: str = None,
 ):
     """Remove a project from the gypsum backend.
-    
+
     See Also:
         :py:func:`~.remove_asset`,
         to remove a specific asset.
diff --git a/src/gypsum_client/resolve_links.py b/src/gypsum_client/resolve_links.py
index e044746..dea1525 100644
--- a/src/gypsum_client/resolve_links.py
+++ b/src/gypsum_client/resolve_links.py
@@ -6,11 +6,11 @@
 from ._utils import (
     BUCKET_CACHE_NAME,
     _acquire_lock,
-    _cache_directory,
     _release_lock,
-    _rest_url,
 )
+from .cache_directory import cache_directory
 from .fetch_operations import fetch_manifest
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -23,7 +23,7 @@ def resolve_links(
     version: str,
     cache_dir: Optional[str] = None,
     overwrite: str = False,
-    url: str = _rest_url(),
+    url: str = rest_url(),
 ):
     """Resolve links in the cache directory.
 
@@ -66,7 +66,6 @@ def resolve_links(
     """
     from .save_operations import save_file
 
-    cache_dir = _cache_directory(cache_dir)
     _acquire_lock(cache_dir, project, asset, version)
 
     def release_lock_wrapper():
diff --git a/src/gypsum_client/rest_url.py b/src/gypsum_client/rest_url.py
new file mode 100644
index 0000000..787dc8b
--- /dev/null
+++ b/src/gypsum_client/rest_url.py
@@ -0,0 +1,27 @@
+from typing import Optional
+
+__author__ = "Jayaram Kancherla"
+__copyright__ = "Jayaram Kancherla"
+__license__ = "MIT"
+
+CURRENT_REST_URL = "https://gypsum.artifactdb.com"
+
+
+def rest_url(url: Optional[str] = None):
+    """URL for the gypsum REST API.
+
+    Get or set the URL for the gypsum REST API.
+
+    Args:
+        url:
+            URL to the gypsum REST API.
+            Defaults to None.
+
+    Returns:
+        String containing the URL to the gypsum REST API.
+    """
+    global CURRENT_REST_URL
+    if url is not None:
+        CURRENT_REST_URL = url
+
+    return CURRENT_REST_URL
diff --git a/src/gypsum_client/s3_config.py b/src/gypsum_client/s3_config.py
index e030ad7..4bece0a 100644
--- a/src/gypsum_client/s3_config.py
+++ b/src/gypsum_client/s3_config.py
@@ -6,8 +6,9 @@
 import requests
 from filelock import FileLock
 
-from ._utils import _cache_directory, _rest_url
+from .cache_directory import cache_directory
 from .config import REQUESTS_MOD
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -22,7 +23,7 @@ def _config_cache_path(cache_dir):
 
 
 def public_s3_config(
-    refresh: bool = False, url: str = _rest_url(), cache_dir: Optional[str] = None
+    refresh: bool = False, url: str = rest_url(), cache_dir: Optional[str] = None
 ) -> dict:
     """Get S3 configuration to the bucket storing the data.
 
@@ -44,7 +45,6 @@ def public_s3_config(
         A dictionary containing the S3 credentials.
     """
     creds = None
-    cache_dir = _cache_directory(cache_dir)
 
     if not refresh:
         if cache_dir is None:
diff --git a/src/gypsum_client/save_operations.py b/src/gypsum_client/save_operations.py
index 6dd22d9..129f30e 100644
--- a/src/gypsum_client/save_operations.py
+++ b/src/gypsum_client/save_operations.py
@@ -9,15 +9,15 @@
 from ._utils import (
     BUCKET_CACHE_NAME,
     _acquire_lock,
-    _cache_directory,
     _release_lock,
-    _rest_url,
     _sanitize_path,
     _save_file,
 )
+from .cache_directory import cache_directory
 from .config import REQUESTS_MOD
 from .list_operations import list_files
 from .resolve_links import resolve_links
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -39,7 +39,7 @@ def save_version(
     overwrite: bool = False,
     relink: bool = True,
     concurrent: int = 1,
-    url: str = _rest_url(),
+    url: str = rest_url(),
 ) -> str:
     """Download all files associated with a version of an asset
     of a project from the gypsum bucket.
@@ -82,7 +82,6 @@ def save_version(
         Path to the local directory where the files are downloaded to.
     """
 
-    cache_dir = _cache_directory(cache_dir)
     _acquire_lock(cache_dir, project, asset, version)
 
     def release_lock_wrapper():
@@ -206,7 +205,7 @@ def save_file(
     path: str,
     cache_dir: Optional[str] = None,
     overwrite: bool = False,
-    url: str = _rest_url(),
+    url: str = rest_url(),
 ):
     """Save a file from a version of a project asset.
 
@@ -256,7 +255,6 @@ def save_file(
         The destintion file path where the file is downloaded to in the local
         file system.
     """
-    cache_dir = _cache_directory(cache_dir)
 
     _acquire_lock(cache_dir, project, asset, version)
 
diff --git a/src/gypsum_client/set_operations.py b/src/gypsum_client/set_operations.py
index ba7974a..6008049 100644
--- a/src/gypsum_client/set_operations.py
+++ b/src/gypsum_client/set_operations.py
@@ -2,9 +2,10 @@
 
 import requests
 
-from ._utils import _remove_slash_url, _rest_url, _sanitize_uploaders
+from ._utils import _remove_slash_url, _sanitize_uploaders
 from .auth import access_token
 from .fetch_operations import fetch_permissions
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -16,7 +17,7 @@ def set_quota(
     baseline: int = None,
     growth_rate: int = None,
     year: int = None,
-    url: str = _rest_url(),
+    url: str = rest_url(),
     token: str = None,
 ):
     """
@@ -96,7 +97,7 @@ def set_permissions(
     owners: str = None,
     uploaders: str = None,
     append: bool = True,
-    url: str = _rest_url(),
+    url: str = rest_url(),
     token: str = None,
 ):
     """
diff --git a/src/gypsum_client/upload_api_operations.py b/src/gypsum_client/upload_api_operations.py
index fb2e641..9a36011 100644
--- a/src/gypsum_client/upload_api_operations.py
+++ b/src/gypsum_client/upload_api_operations.py
@@ -5,9 +5,10 @@
 
 import requests
 
-from ._utils import _remove_slash_url, _rest_url, _sanitize_path
+from ._utils import _remove_slash_url, _sanitize_path
 from .auth import access_token
 from .config import REQUESTS_MOD
+from .rest_url import rest_url
 
 __author__ = "Jayaram Kancherla"
 __copyright__ = "Jayaram Kancherla"
@@ -22,7 +23,7 @@ def start_upload(
     links: List[dict] = None,
     deduplicate: bool = True,
     probation: bool = False,
-    url: str = _rest_url(),
+    url: str = rest_url(),
     token: str = None,
     directory: str = None,
 ) -> dict:
@@ -240,7 +241,7 @@ def start_upload(
     return resp
 
 
-def complete_upload(init: dict, url=_rest_url()):
+def complete_upload(init: dict, url=rest_url()):
     """Complete an upload session after all files have been uploaded.
 
     See Also:
@@ -300,7 +301,7 @@ def complete_upload(init: dict, url=_rest_url()):
         ) from e
 
 
-def abort_upload(init: dict, url=_rest_url()):
+def abort_upload(init: dict, url=rest_url()):
     """Abort an upload session, usually after an irrecoverable error.
 
     See Also:
diff --git a/src/gypsum_client/upload_file_actions.py b/src/gypsum_client/upload_file_actions.py
index bcd50fa..4010df4 100644
--- a/src/gypsum_client/upload_file_actions.py
+++ b/src/gypsum_client/upload_file_actions.py
@@ -3,10 +3,12 @@
 
 import requests
 
-from ._utils import _cache_directory, _remove_slash_url, _rest_url
+from ._utils import _remove_slash_url
 from .auth import access_token
+from .cache_directory import cache_directory
 from .config import REQUESTS_MOD
 from .prepare_directory_for_upload import prepare_directory_upload
+from .rest_url import rest_url
 from .upload_api_operations import abort_upload, complete_upload, start_upload
 
 __author__ = "Jayaram Kancherla"
@@ -19,10 +21,10 @@ def upload_directory(
     project: str,
     asset: str,
     version: str,
-    cache_dir: str = _cache_directory(),
+    cache_dir: str = cache_directory(),
     deduplicate: bool = True,
     probation: bool = False,
-    url: str = _rest_url(),
+    url: str = rest_url(),
     token: str = None,
     concurrent: int = 1,
     abort_failed: bool = True,
@@ -106,7 +108,6 @@ def upload_directory(
     Returns:
         `True` if successfull, otherwise `False`.
     """
-    cache_dir = _cache_directory(cache_dir)
 
     if token is None:
         token = access_token()
@@ -143,7 +144,7 @@ def _upload_file_wrapper(args):
 
 
 def upload_files(
-    init: dict, directory: str = None, url: str = _rest_url(), concurrent: int = 1
+    init: dict, directory: str = None, url: str = rest_url(), concurrent: int = 1
 ):
     """Upload files in an initialized upload session for a version of an asset.