diff --git a/optimade/server/routers/utils.py b/optimade/server/routers/utils.py
index e79983547..704f61830 100644
--- a/optimade/server/routers/utils.py
+++ b/optimade/server/routers/utils.py
@@ -232,16 +232,19 @@ def get_base_url(
 
     Take the base URL from the config file, if it exists, otherwise use the request.
     """
+    if CONFIG.base_url:
+        return CONFIG.base_url.rstrip("/")
+
     parsed_url_request = (
         urllib.parse.urlparse(parsed_url_request)
         if isinstance(parsed_url_request, str)
         else parsed_url_request
     )
-    return (
-        CONFIG.base_url.rstrip("/")
-        if CONFIG.base_url
-        else f"{parsed_url_request.scheme}://{parsed_url_request.netloc}"
-    )
+    base_url = f"{parsed_url_request.scheme}://{parsed_url_request.netloc}"
+    if CONFIG.root_path:
+        base_url = base_url + CONFIG.root_path.rstrip("/")
+
+    return base_url
 
 
 def get_entries(
diff --git a/tests/server/routers/test_utils.py b/tests/server/routers/test_utils.py
index 37b1f8ee5..fc88509d7 100644
--- a/tests/server/routers/test_utils.py
+++ b/tests/server/routers/test_utils.py
@@ -111,3 +111,38 @@ def test_get_providers_warning(caplog, top_dir):
             from optimade.server.data import providers
 
             assert providers == providers_cache
+
+
+def test_get_base_url():
+    """
+    This tests whether the base_url is correctly extracted from the request.
+    """
+    from optimade.server.config import CONFIG
+    from optimade.server.routers.utils import get_base_url
+
+    base_url_org = CONFIG.base_url
+    root_path_org = CONFIG.root_path
+    CONFIG.base_url = None
+    CONFIG.root_path = "/optimade"
+    request_urls = (
+        "http://www.example.com",
+        "http://www.example.com/",
+        "http://www.example.com/optimade/v1/links",
+        "http://www.structures.com/links",
+        "https://www.links.org/optimade/structures/123456",
+    )
+    base_urls = (
+        "http://www.example.com/optimade",
+        "http://www.example.com/optimade",
+        "http://www.example.com/optimade",
+        "http://www.structures.com/optimade",
+        "https://www.links.org/optimade",
+    )
+    results = []
+    for request_url in request_urls:
+        results.append(get_base_url(request_url))
+
+    CONFIG.base_url = base_url_org
+    CONFIG.root_path = root_path_org
+    for i in range(len(base_urls)):
+        assert results[i] == base_urls[i]