diff --git a/keyserver/src/responders/website-responders.js b/keyserver/src/responders/website-responders.js
--- a/keyserver/src/responders/website-responders.js
+++ b/keyserver/src/responders/website-responders.js
@@ -196,12 +196,11 @@
     'default communityPickerStore',
     _isEqual({ chat: null, calendar: null }),
   ),
-  urlPrefix: tString(''),
+  urlPrefix: t.String,
   windowDimensions: t.irreducible(
     'default windowDimensions',
     _isEqual({ width: 0, height: 0 }),
   ),
-  baseHref: t.String,
   notifPermissionAlertInfo: t.irreducible(
     'default notifPermissionAlertInfo',
     _isEqual(defaultNotifPermissionAlertInfo),
@@ -267,7 +266,7 @@
   const appURLFacts = getAppURLFactsFromRequestURL(req.originalUrl);
   const { basePath, baseDomain } = appURLFacts;
   const baseURL = basePath.replace(/\/$/, '');
-  const baseHref = baseDomain + baseURL;
+  const urlPrefix = baseDomain + baseURL;
 
   const loadingPromise = getWebpackCompiledRootComponentForSSR();
   const hasNotAcknowledgedPoliciesPromise = hasAnyNotAcknowledgedPolicies(
@@ -581,10 +580,8 @@
     loadingStatuses: {},
     calendarFilters: defaultCalendarFilters,
     communityPickerStore: { chat: null, calendar: null },
-    // We can use paths local to the <base href> on web
-    urlPrefix: '',
+    urlPrefix,
     windowDimensions: { width: 0, height: 0 },
-    baseHref,
     notifPermissionAlertInfo: defaultNotifPermissionAlertInfo,
     connection: (async () => ({
       ...defaultConnectionInfo(viewer.platform ?? 'web', viewer.timeZone),
diff --git a/web/redux/redux-setup.js b/web/redux/redux-setup.js
--- a/web/redux/redux-setup.js
+++ b/web/redux/redux-setup.js
@@ -83,7 +83,6 @@
   +urlPrefix: string,
   +windowDimensions: WindowDimensions,
   +deviceToken: ?string,
-  +baseHref: string,
   +notifPermissionAlertInfo: NotifPermissionAlertInfo,
   +connection: ConnectionInfo,
   +watchedThreadIDs: $ReadOnlyArray<string>,
diff --git a/web/selectors/socket-selectors.js b/web/selectors/socket-selectors.js
--- a/web/selectors/socket-selectors.js
+++ b/web/selectors/socket-selectors.js
@@ -29,7 +29,7 @@
 import type { AppState } from '../redux/redux-setup.js';
 
 const openSocketSelector: (state: AppState) => () => WebSocket = createSelector(
-  (state: AppState) => state.baseHref,
+  (state: AppState) => state.urlPrefix,
   createOpenSocketFunction,
 );