Use server.host over req.host when computing keystoreId.

Author: tminard

CHANGELOG.md

@@ -1,5 +1,12 @@
 # bedrock-kms-http ChangeLog
 
+## 22.2.0 - 2025-10-dd
+
+### Changed
+- `helpers.getKeystoreId` will use `config.server.host` first if defined
+  before falling back to `req.host` to improve reliability when operating
+  behind a reverse proxy.
+
 ## 22.1.0 - 2025-09-28
 
 ### Changed

lib/helpers.js

@@ -1,12 +1,15 @@
 /*!
- * Copyright (c) 2019-2022 Digital Bazaar, Inc. All rights reserved.
+ * Copyright (c) 2019-2025 Digital Bazaar, Inc. All rights reserved.
  */
+import * as bedrock from '@bedrock/core';
 import forwarded from 'forwarded';
 import ipaddr from 'ipaddr.js';
 
+const {config} = bedrock;
+
 export function getKeystoreId({host, req, localId, routes}) {
   if(!host) {
-    host = req.get('host');
+    host = config.server.host || req.get('host');
   }
   return `https://${host}${routes.keystores}/${localId}`;
 }