Fix Imgur links not previewing & extra extension being added

src/main/java/club/sk1er/patcher/screen/render/overlay/ImagePreview.java

@@ -28,6 +28,7 @@
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.util.Arrays;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -82,7 +83,7 @@ private void handle(String value) {
             return;
         }
 
-        if (value.contains("imgur.com/")) {
+        if (value.contains("imgur.com/") && !value.contains("i.imgur")) {
             final String[] split = value.split("/");
             value = String.format("https://i.imgur.com/%s.png", split[split.length - 1]);
         }
@@ -156,6 +157,10 @@ private void loadUrl(String url) {
             connection.setUseCaches(true);
             connection.setInstanceFollowRedirects(true);
             connection.addRequestProperty("User-Agent", "Patcher Image Previewer");
+            if (url.contains("imgur")) {
+                // Prevents redirect to main website
+                connection.addRequestProperty("Referer", "https://imgur.com/");
+            }
             connection.setReadTimeout(15000);
             connection.setConnectTimeout(15000);
             connection.setDoOutput(true);