diff --git a/gradle.properties b/gradle.properties
index a972173..ba0d50b 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,19 +1,19 @@
 group = org.xbib
 name = netty-http
-version = 4.1.51.5
+version = 4.1.52.0
 
 gradle.wrapper.version = 6.4.1
-netty.version = 4.1.51.Final
-tcnative.version = 2.0.31.Final
-xbib.net.version = 2.1.0
+netty.version = 4.1.52.Final
+tcnative.version = 2.0.34.Final
 bouncycastle.version = 1.66
 reactivestreams.version = 1.0.2
-xbib-guice.version = 4.0.4
 reactivex.version = 1.3.8
 conscrypt.version = 2.4.0
 javassist.version = 3.27.0-GA
 jackson.version = 2.11.1
 mockito.version = 3.4.4
+xbib.net.version = 2.1.0
+xbib-guice.version = 4.0.4
 # uuhh, too many tests to update to jupiter in rx...
 junit.version = 5.6.2
 junit4.version = 4.13
diff --git a/netty-http-server/src/main/java/org/xbib/netty/http/server/Server.java b/netty-http-server/src/main/java/org/xbib/netty/http/server/Server.java
index 1bfe1cd..0a47932 100644
--- a/netty-http-server/src/main/java/org/xbib/netty/http/server/Server.java
+++ b/netty-http-server/src/main/java/org/xbib/netty/http/server/Server.java
@@ -100,6 +100,7 @@ public final class Server implements AutoCloseable {
      * @param parentEventLoopGroup parent event loop group
      * @param childEventLoopGroup child event loop group
      * @param socketChannelClass socket channel class
+     * @param executor an extra blocking thread pool executor or null
      */
     @SuppressWarnings("unchecked")
     private Server(DefaultServerConfig serverConfig,
diff --git a/netty-http-server/src/main/java/org/xbib/netty/http/server/protocol/http1/HttpPipeliningHandler.java b/netty-http-server/src/main/java/org/xbib/netty/http/server/protocol/http1/HttpPipeliningHandler.java
index beb6c25..6f40ec2 100644
--- a/netty-http-server/src/main/java/org/xbib/netty/http/server/protocol/http1/HttpPipeliningHandler.java
+++ b/netty-http-server/src/main/java/org/xbib/netty/http/server/protocol/http1/HttpPipeliningHandler.java
@@ -1,15 +1,22 @@
 package org.xbib.netty.http.server.protocol.http1;
 
+import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
+import io.netty.handler.codec.http.DefaultFullHttpResponse;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.handler.codec.http.HttpVersion;
 import io.netty.handler.codec.http.LastHttpContent;
 
+import java.nio.charset.StandardCharsets;
 import java.util.PriorityQueue;
 import java.util.Queue;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  * Implements HTTP pipelining ordering, ensuring that responses are completely served in the same order as their
@@ -19,6 +26,8 @@ import java.util.concurrent.locks.ReentrantLock;
  */
 public class HttpPipeliningHandler extends ChannelDuplexHandler {
 
+    private final Logger logger = Logger.getLogger(HttpPipeliningHandler.class.getName());
+
     private final int pipelineCapacity;
 
     private final Lock lock;
@@ -80,4 +89,12 @@ public class HttpPipeliningHandler extends ChannelDuplexHandler {
             super.write(ctx, msg, promise);
         }
     }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
+        logger.log(Level.SEVERE, cause.getMessage(), cause);
+        ctx.writeAndFlush(new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,
+                HttpResponseStatus.INTERNAL_SERVER_ERROR,
+                Unpooled.copiedBuffer(cause.getMessage().getBytes(StandardCharsets.UTF_8))));
+    }
 }