GH-1773: Treat 410 Gone as 404 Not Found (#1774)

Fixes #1773

Author: cstamas

maven-resolver-transport-http/src/main/java/org/eclipse/aether/transport/http/HttpTransporter.java

@@ -423,9 +423,11 @@ private URI resolve(TransportTask task) {
 
     @Override
     public int classify(Throwable error) {
-        if (error instanceof HttpResponseException
-                && ((HttpResponseException) error).getStatusCode() == HttpStatus.SC_NOT_FOUND) {
-            return ERROR_NOT_FOUND;
+        if (error instanceof HttpResponseException) {
+            int statusCode = ((HttpResponseException) error).getStatusCode();
+            if (statusCode == HttpStatus.SC_NOT_FOUND || statusCode == HttpStatus.SC_GONE) {
+                return ERROR_NOT_FOUND;
+            }
         }
         return ERROR_OTHER;
     }

maven-resolver-transport-http/src/test/java/org/eclipse/aether/transport/http/HttpTransporterTest.java

@@ -146,6 +146,7 @@ public void testClassify() {
         assertEquals(Transporter.ERROR_OTHER, transporter.classify(new FileNotFoundException()));
         assertEquals(Transporter.ERROR_OTHER, transporter.classify(new HttpResponseException(403, "Forbidden")));
         assertEquals(Transporter.ERROR_NOT_FOUND, transporter.classify(new HttpResponseException(404, "Not Found")));
+        assertEquals(Transporter.ERROR_NOT_FOUND, transporter.classify(new HttpResponseException(410, "Gone")));
     }
 
     @Test