diff --git a/jetty-server/src/main/java/org/eclipse/jetty/server/HttpConnection.java b/jetty-server/src/main/java/org/eclipse/jetty/server/HttpConnection.java
index 5b971525fe8..908d8a0a0a4 100644
--- a/jetty-server/src/main/java/org/eclipse/jetty/server/HttpConnection.java
+++ b/jetty-server/src/main/java/org/eclipse/jetty/server/HttpConnection.java
@@ -375,20 +375,31 @@ public class HttpConnection extends AbstractConnection implements Runnable, Http
                     filled = getEndPoint().fill(requestBuffer);
 
                 if (filled > 0)
+                {
                     bytesIn.add(filled);
-                else if (filled < 0)
-                    _parser.atEOF();
+                }
+                else
+                {
+                    if (filled < 0)
+                        _parser.atEOF();
+                    releaseRequestBuffer();
+                }
 
                 if (LOG.isDebugEnabled())
                     LOG.debug("{} filled {} {}", this, filled, _retainableByteBuffer);
 
                 return filled;
             }
-            catch (IOException e)
+            catch (Throwable x)
             {
                 if (LOG.isDebugEnabled())
-                    LOG.debug("Unable to fill from endpoint {}", getEndPoint(), e);
+                    LOG.debug("Unable to fill from endpoint {}", getEndPoint(), x);
                 _parser.atEOF();
+                if (_retainableByteBuffer != null)
+                {
+                    _retainableByteBuffer.clear();
+                    releaseRequestBuffer();
+                }
                 return -1;
             }
         }
diff --git a/tests/test-http-client-transport/src/test/java/org/eclipse/jetty/http/client/HttpClientContinueTest.java b/tests/test-http-client-transport/src/test/java/org/eclipse/jetty/http/client/HttpClientContinueTest.java
index 680535f6b5b..00d935c7a40 100644
--- a/tests/test-http-client-transport/src/test/java/org/eclipse/jetty/http/client/HttpClientContinueTest.java
+++ b/tests/test-http-client-transport/src/test/java/org/eclipse/jetty/http/client/HttpClientContinueTest.java
@@ -45,14 +45,21 @@ import org.eclipse.jetty.http.HttpHeader;
 import org.eclipse.jetty.http.HttpHeaderValue;
 import org.eclipse.jetty.http.HttpMethod;
 import org.eclipse.jetty.http.HttpStatus;
+import org.eclipse.jetty.io.ArrayRetainableByteBufferPool;
+import org.eclipse.jetty.io.ByteBufferPool;
+import org.eclipse.jetty.io.RetainableByteBufferPool;
+import org.eclipse.jetty.server.Handler;
 import org.eclipse.jetty.server.Request;
 import org.eclipse.jetty.server.handler.AbstractHandler;
 import org.eclipse.jetty.util.IO;
+import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ArgumentsSource;
 
 import static org.awaitility.Awaitility.await;
 import static org.eclipse.jetty.http.client.Transport.FCGI;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
@@ -63,6 +70,22 @@ import static org.junit.jupiter.api.Assumptions.assumeTrue;
 
 public class HttpClientContinueTest extends AbstractTest<TransportScenario>
 {
+    @AfterEach
+    public void dispose()
+    {
+        if (scenario == null || scenario.connector == null)
+            return;
+        ByteBufferPool bbp = scenario.connector.getByteBufferPool();
+        if (bbp == null)
+            return;
+        RetainableByteBufferPool rbbp = bbp.asRetainableByteBufferPool();
+        if (rbbp instanceof ArrayRetainableByteBufferPool.Tracking)
+        {
+            ArrayRetainableByteBufferPool.Tracking tracking = (ArrayRetainableByteBufferPool.Tracking)rbbp;
+            await().atMost(5, TimeUnit.SECONDS).untilAsserted(() -> assertThat("Server leaks: " + tracking.dumpLeaks(), tracking.getLeaks().size(), is(0)));
+        }
+    }
+
     @Override
     public void init(Transport transport) throws IOException
     {
@@ -852,6 +875,28 @@ public class HttpClientContinueTest extends AbstractTest<TransportScenario>
         }
     }
 
+    @ParameterizedTest
+    @ArgumentsSource(TransportProvider.class)
+    public void testExpect100ContinueThen404(Transport transport) throws Exception
+    {
+        init(transport);
+
+        // No Handler so every request is a 404.
+        scenario.start((Handler)null);
+
+        for (int i = 0; i < 100; ++i)
+        {
+            CountDownLatch latch = new CountDownLatch(1);
+            AsyncRequestContent requestContent = new AsyncRequestContent("text-plain");
+            scenario.client.newRequest(scenario.newURI())
+                .headers(headers -> headers.put(HttpHeader.EXPECT, HttpHeaderValue.CONTINUE))
+                .body(requestContent)
+                .send(result -> latch.countDown());
+
+            assertTrue(latch.await(5, TimeUnit.SECONDS));
+        }
+    }
+
     private void readRequestHeaders(InputStream input) throws IOException
     {
         int crlfs = 0;
diff --git a/tests/test-http-client-transport/src/test/java/org/eclipse/jetty/http/client/TransportScenario.java b/tests/test-http-client-transport/src/test/java/org/eclipse/jetty/http/client/TransportScenario.java
index 51a9eaf4d54..941cfe568d9 100644
--- a/tests/test-http-client-transport/src/test/java/org/eclipse/jetty/http/client/TransportScenario.java
+++ b/tests/test-http-client-transport/src/test/java/org/eclipse/jetty/http/client/TransportScenario.java
@@ -43,6 +43,8 @@ import org.eclipse.jetty.http3.client.http.HttpClientTransportOverHTTP3;
 import org.eclipse.jetty.http3.server.AbstractHTTP3ServerConnectionFactory;
 import org.eclipse.jetty.http3.server.HTTP3ServerConnectionFactory;
 import org.eclipse.jetty.http3.server.HTTP3ServerConnector;
+import org.eclipse.jetty.io.ArrayByteBufferPool;
+import org.eclipse.jetty.io.ByteBufferPool;
 import org.eclipse.jetty.io.ClientConnector;
 import org.eclipse.jetty.jmx.MBeanContainer;
 import org.eclipse.jetty.quic.server.QuicServerConnector;
@@ -122,7 +124,8 @@ public class TransportScenario
             case H2C:
             case H2:
             case FCGI:
-                return new ServerConnector(server, 1, 1, provideServerConnectionFactory(transport));
+                ByteBufferPool bufferPool = new ArrayByteBufferPool.Tracking();
+                return new ServerConnector(server, null, null, bufferPool, 1, 1, provideServerConnectionFactory(transport));
             case H3:
                 HTTP3ServerConnector http3ServerConnector = new HTTP3ServerConnector(server, sslContextFactory, provideServerConnectionFactory(transport));
                 http3ServerConnector.getQuicConfiguration().setPemWorkDirectory(Path.of(System.getProperty("java.io.tmpdir")));