correctly handle root favicons for non-default ports

commafeed-server/src/main/java/com/commafeed/backend/favicon/RootFaviconFetcher.java

@@ -30,7 +30,12 @@ public class RootFaviconFetcher implements FaviconFetcher {
 
         try {
             URI uri = URI.create(url.trim());
-            String faviconUrl = "%s://%s/favicon.ico".formatted(uri.getScheme(), uri.getHost());
+            String faviconUrl =
+                    "%s://%s%s/favicon.ico"
+                            .formatted(
+                                    uri.getScheme(),
+                                    uri.getHost(),
+                                    uri.getPort() > 0 ? ":" + uri.getPort() : "");
 
             log.debug("getting root icon at {}", faviconUrl);
             HttpResult result = getter.get(faviconUrl);

commafeed-server/src/test/java/com/commafeed/backend/favicon/RootFaviconFetcherTest.java

@@ -47,6 +47,26 @@ class RootFaviconFetcherTest {
         Assertions.assertTrue(result.mediaType().isCompatible(MediaType.valueOf(contentType)));
     }
 
+    @Test
+    void testFetchUsesLinkWhenAvailableWithNonDefaultPort() throws Exception {
+        Feed feed = new Feed();
+        feed.setUrl("https://feeds.example.com:8000/feed");
+        feed.setLink("https://www.example.com:8000/blog");
+
+        byte[] iconBytes = new byte[1000];
+        String contentType = "image/x-icon";
+        HttpResult httpResult =
+                new HttpResult(iconBytes, contentType, null, null, null, Duration.ZERO);
+        Mockito.when(httpGetter.get("https://www.example.com:8000/favicon.ico"))
+                .thenReturn(httpResult);
+
+        Favicon result = faviconFetcher.fetch(feed);
+
+        Assertions.assertNotNull(result);
+        Assertions.assertEquals(iconBytes, result.icon());
+        Assertions.assertTrue(result.mediaType().isCompatible(MediaType.valueOf(contentType)));
+    }
+
     @Test
     void testFetchFallsBackToUrlWhenLinkIsNull() throws Exception {
         Feed feed = new Feed();