diff --git a/src/config.ts b/src/config.ts
index fd208c07..42d6ecb9 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -21,6 +21,17 @@ const Conf = {
   get publishRelays() {
     return ['wss://relay.mostr.pub'];
   },
+  /** Merges the path with the localDomain. */
+  url(path: string): string {
+    if (path.startsWith('/')) {
+      // Path is a path.
+      return new URL(path, Conf.localDomain).toString();
+    } else {
+      // Path is possibly a full URL. Replace the domain.
+      const { pathname } = new URL(path);
+      return new URL(pathname, Conf.localDomain).toString();
+    }
+  },
 };
 
 export { Conf };
diff --git a/src/middleware/auth98.ts b/src/middleware/auth98.ts
index 4910b0ed..99865a27 100644
--- a/src/middleware/auth98.ts
+++ b/src/middleware/auth98.ts
@@ -28,7 +28,7 @@ function auth98(opts: Auth98Opts = {}): AppMiddleware {
       .refine((event) => {
         const url = findTag(event.tags, 'u')?.[1];
         try {
-          return url === localUrl(c.req.url);
+          return url === Conf.url(c.req.url);
         } catch (_e) {
           return false;
         }
@@ -51,11 +51,6 @@ function auth98(opts: Auth98Opts = {}): AppMiddleware {
   };
 }
 
-function localUrl(url: string): string {
-  const { pathname } = new URL(url);
-  return new URL(pathname, Conf.localDomain).toString();
-}
-
 const requireProof: AppMiddleware = async (c, next) => {
   const pubkey = c.get('pubkey');
   const proof = c.get('proof');
diff --git a/src/note.ts b/src/note.ts
index a4344eae..514044fb 100644
--- a/src/note.ts
+++ b/src/note.ts
@@ -4,13 +4,11 @@ import { linkify, linkifyStr, mime, nip19, nip21 } from '@/deps.ts';
 linkify.registerCustomProtocol('nostr', true);
 linkify.registerCustomProtocol('wss');
 
-const url = (path: string) => new URL(path, Conf.localDomain).toString();
-
 const linkifyOpts: linkify.Opts = {
   render: {
     hashtag: ({ content }) => {
       const tag = content.replace(/^#/, '');
-      const href = url(`/tags/${tag}`);
+      const href = Conf.url(`/tags/${tag}`);
       return `<a class=\"mention hashtag\" href=\"${href}\" rel=\"tag\"><span>#</span>${tag}</a>`;
     },
     url: ({ content }) => {
@@ -19,7 +17,7 @@ const linkifyOpts: linkify.Opts = {
         const pubkey = getDecodedPubkey(decoded);
         if (pubkey) {
           const name = pubkey.substring(0, 8);
-          const href = url(`/users/${pubkey}`);
+          const href = Conf.url(`/users/${pubkey}`);
           return `<span class="h-card"><a class="u-url mention" href="${href}" rel="ugc">@<span>${name}</span></a></span>`;
         } else {
           return '';