Fallback to urlcanon when URL parsing fails

Java's URL parser has become more strict over time so there are URLs that are accepted by old versions but are now rejected.

src/outbackcdx/UrlCanonicalizer.java

@@ -18,6 +18,8 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import org.netpreserve.urlcanon.Canonicalizer;
+import org.netpreserve.urlcanon.ParsedUrl;
 import org.snakeyaml.engine.v2.api.Load;
 import org.snakeyaml.engine.v2.api.LoadSettings;
 
@@ -370,7 +372,10 @@ public static String canonicalize(String rawUrl) {
         try {
             return canonicalize(makeUrl(rawUrl)).toString();
         } catch (MalformedURLException e) {
-            return rawUrl;
+            // if Java's URL parser rejected the input fallback urlcanon instead
+            ParsedUrl parsedUrl = ParsedUrl.parseUrl(rawUrl);
+            Canonicalizer.AGGRESSIVE.canonicalize(parsedUrl);
+            return parsedUrl.toString();
         }
     }