Use 'abs:' prefix

src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubePlaylistExtractor.java

@@ -265,7 +265,7 @@ public class YoutubePlaylistExtractor extends PlaylistExtractor {
 
                 @Override
                 public String getUploaderUrl() throws ParsingException {
-                    return getUploaderLink().attr("href");
+                    return getUploaderLink().attr("abs:href");
                 }
 
                 @Override

src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeStreamInfoItemExtractor.java

@@ -94,23 +94,13 @@ public class YoutubeStreamInfoItemExtractor implements StreamInfoItemExtractor {
         }
     }
 
-    private static String fixRelativeUrls(String url) {
-        if(url == null || url.isEmpty()) return url;
-        if(url.startsWith("/")) {
-            return "https://youtube.com" + url;
-        } else {
-            return url;
-        }
-    }
-
     @Override
     public String getUploaderUrl() throws ParsingException {
         try {
             try {
-                String url = item.select("div[class=\"yt-lockup-byline\"]").first()
+                return item.select("div[class=\"yt-lockup-byline\"]").first()
                         .select("a").first()
-                        .attr("href");
+                        .attr("abs:href");
-                return fixRelativeUrls(url);
             } catch (Exception e){}
 
             // try this if the first didn't work

src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeTrendingExtractor.java

@@ -110,7 +110,7 @@ public class YoutubeTrendingExtractor extends KioskExtractor {
                     @Override
                     public String getUploaderUrl() throws ParsingException {
                         try {
-                            String link = getUploaderLink().attr("href");
+                            String link = getUploaderLink().attr("abs:href");
                             if (link.isEmpty()) {
                                 throw new IllegalArgumentException("is empty");
                             }