Bug fix: Handle CancelledKeyException thrown by abort method of the H2 stream

Author: ok2c

httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/H2Stream.java

@@ -29,6 +29,7 @@
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
+import java.nio.channels.CancelledKeyException;
 import java.nio.charset.CharacterCodingException;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -249,11 +250,13 @@ HandlerFactory<AsyncPushConsumer> getPushHandlerFactory() {
 
     boolean abort() {
         if (cancelled.compareAndSet(false, true)) {
-            channel.requestOutput();
-            return true;
-        } else {
-            return false;
+            try {
+                channel.requestOutput();
+                return true;
+            } catch (final CancelledKeyException ignore) {
+            }
         }
+        return false;
     }
 
     boolean abortGracefully() throws IOException {