diff --git a/cellxgene_gateway/cache_key.py b/cellxgene_gateway/cache_key.py
index 975f3c8..7c9a013 100644
--- a/cellxgene_gateway/cache_key.py
+++ b/cellxgene_gateway/cache_key.py
@@ -15,8 +15,7 @@
 # 3) somedir/dataset_annotations: an annotation directory. The corresponding h5ad must exist, but the directory may not.
 #    in this case, descriptor == 'somedir/dataset_annotations', dataset == 'somedir/dataset.h5ad'
 
-from flask.helpers import url_for
-
+from cellxgene_gateway import flask_util
 from cellxgene_gateway.items.item import Item
 from cellxgene_gateway.items.item_source import ItemSource, LookupResult
 
@@ -41,12 +40,14 @@ class CacheKey:
             return self.source.get_local_path(self.annotation_item)
 
     def relaunch_url(self):
-        return url_for("do_relaunch", source=self.source_name, path=self.descriptor)
+        return flask_util.relaunch_url(self.descriptor, self.source_name)
 
     def gateway_basepath(self):
-        return (
-            url_for("do_view", source_name=self.source_name, path=self.descriptor) + "/"
-        )
+        return self.view_url + "/"
+
+    @property
+    def view_url(self):
+        return flask_util.view_url(self.descriptor, self.source_name)
 
     @property
     def source_name(self):
diff --git a/cellxgene_gateway/filecrawl.py b/cellxgene_gateway/filecrawl.py
index c2d5a92..8a62818 100644
--- a/cellxgene_gateway/filecrawl.py
+++ b/cellxgene_gateway/filecrawl.py
@@ -10,23 +10,20 @@
 import os
 import urllib.parse
 
-from flask import url_for
-
-from cellxgene_gateway import env
+from cellxgene_gateway import env, flask_util
+from cellxgene_gateway.cache_key import CacheKey
 from cellxgene_gateway.dir_util import annotations_suffix, make_annotations, make_h5ad
 
 
 def render_annotations(item, item_source):
-    url = url_for(
-        "do_view",
-        path=item_source.get_annotations_subpath(item),
-        source_name=item_source.name,
+    url = flask_util.view_url(
+        item_source.get_annotations_subpath(item), item_source.name
     )
     new_annotation = f"<a class='new' href='{url}'>new</a>"
     annotations = (
         ", ".join(
             [
-                f"<a href='{url_for('do_view', path=a.descriptor, source_name = item_source.name)}/'>{a.name}</a>"
+                f"<a href='{CacheKey(item, item_source, a).view_url}/'>{a.name}</a>"
                 for a in item.annotations
             ]
         )
@@ -38,8 +35,7 @@ def render_annotations(item, item_source):
 
 
 def render_item(item, item_source):
-    url = url_for("do_view", path=item.descriptor, source_name=item_source.name) + "/"
-    item_string = f"<li> <a href='{ url }'>{item.name}</a> {render_annotations(item, item_source)}</li>"
+    item_string = f"<li> <a href='{ CacheKey(item, item_source).view_url }/'>{item.name}</a> {render_annotations(item, item_source)}</li>"
     return item_string
 
 
diff --git a/cellxgene_gateway/flask_util.py b/cellxgene_gateway/flask_util.py
index 9132929..b594479 100644
--- a/cellxgene_gateway/flask_util.py
+++ b/cellxgene_gateway/flask_util.py
@@ -7,9 +7,27 @@
 # OR CONDITIONS OF ANY KIND, either express or implied. See the License for
 # the specific language governing permissions and limitations under the License.
 
-from flask import request
+from flask import request, url_for
 
 
 def querystring():
     qs = request.query_string.decode()
     return f"?{qs}" if len(qs) > 0 else ""
+
+
+include_source_in_url = False
+
+
+def url(endpoint, descriptor, source_name):
+    if include_source_in_url:
+        return url_for(endpoint, source_name=source_name, path=descriptor)
+    else:
+        return url_for(endpoint, path=descriptor)
+
+
+def view_url(descriptor, source_name):
+    return url("do_view", descriptor, source_name)
+
+
+def relaunch_url(descriptor, source_name):
+    return url("do_relaunch", descriptor, source_name)
diff --git a/cellxgene_gateway/gateway.py b/cellxgene_gateway/gateway.py
index e8b8b50..5b66c74 100644
--- a/cellxgene_gateway/gateway.py
+++ b/cellxgene_gateway/gateway.py
@@ -26,7 +26,7 @@ from flask_api import status
 from werkzeug.middleware.proxy_fix import ProxyFix
 from werkzeug.utils import secure_filename
 
-from cellxgene_gateway import env
+from cellxgene_gateway import env, flask_util
 from cellxgene_gateway.backend_cache import BackendCache
 from cellxgene_gateway.cache_entry import CacheEntryStatus
 from cellxgene_gateway.cache_key import CacheKey
@@ -248,7 +248,7 @@ def do_relaunch(path):
         match.terminate()
     qs = request.query_string.decode()
     return redirect(
-        url_for("do_view", path=path) + (f"?{qs}" if len(qs) > 0 else ""),
+        key.view_url + (f"?{qs}" if len(qs) > 0 else ""),
         code=302,
     )
 
@@ -302,6 +302,7 @@ def main():
         default_item_source = "local"
     if len(item_sources) == 0:
         raise Exception("Please specify CELLXGENE_DATA or CELLXGENE_BUCKET")
+    flask_util.include_source_in_url = len(item_sources) > 1
 
     launch()
 
diff --git a/cellxgene_gateway/templates/cache_status.html b/cellxgene_gateway/templates/cache_status.html
index 5e2ff41..54e30c0 100644
--- a/cellxgene_gateway/templates/cache_status.html
+++ b/cellxgene_gateway/templates/cache_status.html
@@ -48,7 +48,7 @@
                <tr>
                     <td>{{ entry.pid }}</td>
                     <td><a
-                              href="{{ url_for('do_view', path=entry.key.descriptor, source_name=entry.key.source_name) }}">{{ entry.key.h5ad_item.descriptor }}</a>
+                              href="{{ entry.key.view_url }}">{{ entry.key.h5ad_item.descriptor }}</a>
                     </td>
                     <td>{{ entry.key.annotation_descriptor }}</td>
                     <td>{{ entry.source_name }}</td>