HTTPCLIENT-2201: protocol exception thrown while consuming pushed hea…

…ders can leave the pushed stream on the client side in an inconsistent state

httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/ClientPushH2StreamHandler.java

@@ -103,17 +103,16 @@ public void consumePromise(final List<Header> headers) throws HttpException, IOE
         if (requestState == MessageState.HEADERS) {
 
             request = DefaultH2RequestConverter.INSTANCE.convert(headers);
-
-            final AsyncPushConsumer handler;
             try {
-                handler = pushHandlerFactory != null ? pushHandlerFactory.create(request, context) : null;
+                exchangeHandler = pushHandlerFactory != null ? pushHandlerFactory.create(request, context) : null;
             } catch (final ProtocolException ex) {
+                exchangeHandler = new NoopAsyncPushHandler();
                 throw new H2StreamResetException(H2Error.PROTOCOL_ERROR, ex.getMessage());
             }
-            if (handler == null) {
+            if (exchangeHandler == null) {
+                exchangeHandler = new NoopAsyncPushHandler();
                 throw new H2StreamResetException(H2Error.REFUSED_STREAM, "Stream refused");
             }
-            exchangeHandler = handler;
 
             context.setProtocolVersion(HttpVersion.HTTP_2);
             context.setAttribute(HttpCoreContext.HTTP_REQUEST, request);

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

@@ -0,0 +1,72 @@
+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+package org.apache.hc.core5.http2.impl.nio;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.List;
+
+import org.apache.hc.core5.http.EntityDetails;
+import org.apache.hc.core5.http.Header;
+import org.apache.hc.core5.http.HttpException;
+import org.apache.hc.core5.http.HttpRequest;
+import org.apache.hc.core5.http.HttpResponse;
+import org.apache.hc.core5.http.nio.AsyncPushConsumer;
+import org.apache.hc.core5.http.nio.CapacityChannel;
+import org.apache.hc.core5.http.protocol.HttpContext;
+
+class NoopAsyncPushHandler implements AsyncPushConsumer {
+
+    @Override
+    public void consumePromise(final HttpRequest promise,
+                               final HttpResponse response,
+                               final EntityDetails entityDetails,
+                               final HttpContext context) throws HttpException, IOException {
+    }
+
+    @Override
+    public void updateCapacity(final CapacityChannel capacityChannel) throws IOException {
+        capacityChannel.update(Integer.MAX_VALUE);
+    }
+
+    @Override
+    public void consume(final ByteBuffer src) throws IOException {
+    }
+
+    @Override
+    public void streamEnd(final List<? extends Header> trailers) throws HttpException, IOException {
+    }
+
+    @Override
+    public void failed(final Exception cause) {
+    }
+
+    @Override
+    public void releaseResources() {
+    }
+
+}