faviconCache: check favicon.ico explicitly

src/utils/favicon.ts

@@ -85,6 +85,16 @@ async function fetchFavicon(domain: string, signal?: AbortSignal): Promise<URL>
     }
   }
 
+  // Fallback to checking `/favicon.ico` of the domain.
+  const url = new URL('/favicon.ico', `https://${domain}/`);
+  const fallback = await fetchWorker(url, { method: 'HEAD', signal });
+  const contentType = fallback.headers.get('content-type');
+
+  if (fallback.ok && contentType === 'image/vnd.microsoft.icon') {
+    logi({ level: 'info', ns: 'ditto.favicon', domain, state: 'found', url });
+    return url;
+  }
+
   logi({ level: 'info', ns: 'ditto.favicon', domain, state: 'failed' });
 
   throw new Error(`Favicon not found: ${domain}`);

src/views/mastodon/accounts.ts

@@ -47,11 +47,6 @@ function renderAccount(event: Omit<DittoEvent, 'id' | 'sig'>, opts: ToAccountOpt
   const parsed05 = stats?.nip05 ? parseNip05(stats.nip05) : undefined;
   const acct = parsed05?.handle || npub;
 
-  let favicon: string | undefined = stats?.favicon;
-  if (!favicon && parsed05) {
-    favicon = new URL('/favicon.ico', `https://${parsed05.domain}/`).toString();
-  }
-
   const { html } = parseNoteContent(about || '', []);
 
   const fields = _fields
@@ -137,7 +132,7 @@ function renderAccount(event: Omit<DittoEvent, 'id' | 'sig'>, opts: ToAccountOpt
       is_local: parsed05?.domain === Conf.url.host,
       settings_store: opts.withSource ? opts.settingsStore : undefined,
       tags: [...getTagSet(event.user?.tags ?? [], 't')],
-      favicon,
+      favicon: stats?.favicon,
     },
     nostr: {
       pubkey,