ok2c commented on code in PR #741:
URL: 
https://github.com/apache/httpcomponents-core/pull/741#discussion_r4505876453


##########
httpcore5-h2/src/test/java/org/apache/hc/core5/http2/impl/nio/TestAbstractH2StreamMultiplexer.java:
##########
@@ -2547,4 +2547,45 @@ void 
testDataOnReservedRemoteStreamIsConnectionProtocolError() throws Exception
                 ArgumentMatchers.anyBoolean());
     }
 
+
+    @Test
+    void testMalformedSettingsAfterOverheadLimitReportsFrameSizeError() throws 
Exception {
+        final AbstractH2StreamMultiplexer mux = new H2StreamMultiplexerImpl(
+                protocolIOSession,
+                FRAME_FACTORY,
+                StreamIdGenerator.ODD,
+                httpProcessor,
+                CharCodingConfig.DEFAULT,
+                H2Config.custom().build(),
+                h2StreamListener,
+                () -> streamHandler);
+
+        // Exhaust the per-connection limiter deterministically without 
depending
+        // on test execution speed. TestAbstractH2StreamMultiplexer already 
uses
+        // reflection for internal protocol state checks.
+        final Field limiterField = AbstractH2StreamMultiplexer.class

Review Comment:
   @arturobernalg Rather make `H2ControlFrameRateLimiter` injectable through 
the constructor to avoid having to use reflection. Please also make 
`H2ControlFrameRateLimiter` minimally configurable through constructor 
parameters..  



##########
httpcore5-h2/src/test/java/org/apache/hc/core5/http2/impl/nio/TestH2ControlFrameRateLimiter.java:
##########
@@ -0,0 +1,96 @@
+/*
+ * ====================================================================
+ * 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 org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class TestH2ControlFrameRateLimiter {
+
+    @Test
+    void testBurstAndRejection() {
+        final H2ControlFrameRateLimiter limiter = new 
H2ControlFrameRateLimiter();
+        for (int i = 0; i < H2ControlFrameRateLimiter.CAPACITY; i++) {
+            Assertions.assertTrue(limiter.accept(10L));
+        }
+        Assertions.assertFalse(limiter.accept(10L));
+    }
+
+    @Test
+    void testRefillAndRecovery() {
+        final H2ControlFrameRateLimiter limiter = new 
H2ControlFrameRateLimiter();
+        for (int i = 0; i < H2ControlFrameRateLimiter.CAPACITY; i++) {
+            Assertions.assertTrue(limiter.accept(1L));
+        }
+        Assertions.assertFalse(limiter.accept(1L));
+        Assertions.assertTrue(limiter.accept(1L + 1_000_000_000L / 
H2ControlFrameRateLimiter.REFILL_PER_SECOND));

Review Comment:
   @arturobernalg I am still having a hard time validating the algorithm. Could 
you use `TimeUnit`s like `TimeUnit.SECONDS.toNanos(1)` to make it a little 
easier to understand the expectations of the test case.



##########
httpcore5-h2/src/test/java/org/apache/hc/core5/http2/examples/H2OverheadProtectionExample.java:
##########
@@ -0,0 +1,400 @@
+/*
+ * ====================================================================
+ * 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.examples;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.EOFException;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.hc.core5.http.ContentType;
+import org.apache.hc.core5.http.HttpStatus;
+import org.apache.hc.core5.http.Message;
+import org.apache.hc.core5.http.Method;
+import org.apache.hc.core5.http.URIScheme;
+import org.apache.hc.core5.http.impl.bootstrap.HttpAsyncServer;
+import org.apache.hc.core5.http.message.BasicHttpResponse;
+import org.apache.hc.core5.http.nio.support.AsyncServerPipeline;
+import org.apache.hc.core5.http2.HttpVersionPolicy;
+import org.apache.hc.core5.http2.impl.nio.bootstrap.H2ServerBootstrap;
+import org.apache.hc.core5.io.CloseMode;
+import org.apache.hc.core5.reactor.ListenerEndpoint;
+
+public final class H2OverheadProtectionExample {

Review Comment:
   @arturobernalg This is too much for an example class, too complex and not 
really helpful. Either convert it to a proper integration test or drop it 
entirely. 



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