diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/HttpClientCodec.java b/codec-http/src/main/java/io/netty/handler/codec/http/HttpClientCodec.java
index 1ca4c464ad..2e6652c52a 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/HttpClientCodec.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/HttpClientCodec.java
@@ -28,6 +28,10 @@ import java.util.List;
 import java.util.Queue;
 import java.util.concurrent.atomic.AtomicLong;
 
+import static io.netty.handler.codec.http.HttpObjectDecoder.DEFAULT_MAX_CHUNK_SIZE;
+import static io.netty.handler.codec.http.HttpObjectDecoder.DEFAULT_MAX_HEADER_SIZE;
+import static io.netty.handler.codec.http.HttpObjectDecoder.DEFAULT_MAX_INITIAL_LINE_LENGTH;
+
 /**
  * A combination of {@link HttpRequestEncoder} and {@link HttpResponseDecoder}
  * which enables easier client side HTTP implementation. {@link HttpClientCodec}
@@ -61,7 +65,7 @@ public final class HttpClientCodec extends CombinedChannelDuplexHandler<HttpResp
      * {@code maxChunkSize (8192)}).
      */
     public HttpClientCodec() {
-        this(4096, 8192, 8192, false);
+        this(DEFAULT_MAX_INITIAL_LINE_LENGTH, DEFAULT_MAX_HEADER_SIZE, DEFAULT_MAX_CHUNK_SIZE, false);
     }
 
     /**
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java b/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java
index 4134735f50..25f11936f9 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java
@@ -102,6 +102,13 @@ import java.util.List;
  * implement all abstract methods properly.
  */
 public abstract class HttpObjectDecoder extends ByteToMessageDecoder {
+    public static final int DEFAULT_MAX_INITIAL_LINE_LENGTH = 4096;
+    public static final int DEFAULT_MAX_HEADER_SIZE = 8192;
+    public static final boolean DEFAULT_CHUNKED_SUPPORTED = true;
+    public static final int DEFAULT_MAX_CHUNK_SIZE = 8192;
+    public static final boolean DEFAULT_VALIDATE_HEADERS = true;
+    public static final int DEFAULT_INITIAL_BUFFER_SIZE = 128;
+
     private static final String EMPTY_VALUE = "";
 
     private final int maxChunkSize;
@@ -147,7 +154,8 @@ public abstract class HttpObjectDecoder extends ByteToMessageDecoder {
      * {@code maxChunkSize (8192)}.
      */
     protected HttpObjectDecoder() {
-        this(4096, 8192, 8192, true);
+        this(DEFAULT_MAX_INITIAL_LINE_LENGTH, DEFAULT_MAX_HEADER_SIZE, DEFAULT_MAX_CHUNK_SIZE,
+             DEFAULT_CHUNKED_SUPPORTED);
     }
 
     /**
@@ -155,7 +163,7 @@ public abstract class HttpObjectDecoder extends ByteToMessageDecoder {
      */
     protected HttpObjectDecoder(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean chunkedSupported) {
-        this(maxInitialLineLength, maxHeaderSize, maxChunkSize, chunkedSupported, true);
+        this(maxInitialLineLength, maxHeaderSize, maxChunkSize, chunkedSupported, DEFAULT_VALIDATE_HEADERS);
     }
 
     /**
@@ -164,7 +172,8 @@ public abstract class HttpObjectDecoder extends ByteToMessageDecoder {
     protected HttpObjectDecoder(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize,
             boolean chunkedSupported, boolean validateHeaders) {
-        this(maxInitialLineLength, maxHeaderSize, maxChunkSize, chunkedSupported, validateHeaders, 128);
+        this(maxInitialLineLength, maxHeaderSize, maxChunkSize, chunkedSupported, validateHeaders,
+             DEFAULT_INITIAL_BUFFER_SIZE);
     }
 
     protected HttpObjectDecoder(
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/HttpRequestDecoder.java b/codec-http/src/main/java/io/netty/handler/codec/http/HttpRequestDecoder.java
index 24252c7358..70c1db5540 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/HttpRequestDecoder.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/HttpRequestDecoder.java
@@ -67,18 +67,19 @@ public class HttpRequestDecoder extends HttpObjectDecoder {
      */
     public HttpRequestDecoder(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
-        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, true);
+        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED);
     }
 
     public HttpRequestDecoder(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders) {
-        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, true, validateHeaders);
+        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED, validateHeaders);
     }
 
     public HttpRequestDecoder(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders,
             int initialBufferSize) {
-        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, true, validateHeaders, initialBufferSize);
+        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED, validateHeaders,
+              initialBufferSize);
     }
 
     @Override
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/HttpResponseDecoder.java b/codec-http/src/main/java/io/netty/handler/codec/http/HttpResponseDecoder.java
index 21491971ef..bd26b3c1fb 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/HttpResponseDecoder.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/HttpResponseDecoder.java
@@ -98,18 +98,19 @@ public class HttpResponseDecoder extends HttpObjectDecoder {
      */
     public HttpResponseDecoder(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
-        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, true);
+        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED);
     }
 
     public HttpResponseDecoder(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders) {
-        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, true, validateHeaders);
+        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED, validateHeaders);
     }
 
     public HttpResponseDecoder(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders,
             int initialBufferSize) {
-        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, true, validateHeaders, initialBufferSize);
+        super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED, validateHeaders,
+              initialBufferSize);
     }
 
     @Override
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/HttpServerCodec.java b/codec-http/src/main/java/io/netty/handler/codec/http/HttpServerCodec.java
index 6e36128fa2..d08474974b 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/HttpServerCodec.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/HttpServerCodec.java
@@ -23,6 +23,10 @@ import java.util.ArrayDeque;
 import java.util.List;
 import java.util.Queue;
 
+import static io.netty.handler.codec.http.HttpObjectDecoder.DEFAULT_MAX_CHUNK_SIZE;
+import static io.netty.handler.codec.http.HttpObjectDecoder.DEFAULT_MAX_HEADER_SIZE;
+import static io.netty.handler.codec.http.HttpObjectDecoder.DEFAULT_MAX_INITIAL_LINE_LENGTH;
+
 /**
  * A combination of {@link HttpRequestDecoder} and {@link HttpResponseEncoder}
  * which enables easier server side HTTP implementation.
@@ -41,7 +45,7 @@ public final class HttpServerCodec extends CombinedChannelDuplexHandler<HttpRequ
      * {@code maxChunkSize (8192)}).
      */
     public HttpServerCodec() {
-        this(4096, 8192, 8192);
+        this(DEFAULT_MAX_INITIAL_LINE_LENGTH, DEFAULT_MAX_HEADER_SIZE, DEFAULT_MAX_CHUNK_SIZE);
     }
 
     /**
diff --git a/codec-http/src/main/java/io/netty/handler/codec/rtsp/RtspDecoder.java b/codec-http/src/main/java/io/netty/handler/codec/rtsp/RtspDecoder.java
index acc028978f..b2a353d298 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/rtsp/RtspDecoder.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/rtsp/RtspDecoder.java
@@ -71,16 +71,6 @@ public class RtspDecoder extends HttpObjectDecoder {
      */
     private static final Pattern versionPattern = Pattern.compile("RTSP/\\d\\.\\d");
 
-    /**
-     * Constant for default max initial line length.
-     */
-    public static final int DEFAULT_MAX_INITIAL_LINE_LENGTH = 4096;
-
-    /**
-     * Constant for default max header size.
-     */
-    public static final int DEFAULT_MAX_HEADER_SIZE = 8192;
-
     /**
      * Constant for default max content length.
      */
diff --git a/codec-http/src/main/java/io/netty/handler/codec/rtsp/RtspObjectDecoder.java b/codec-http/src/main/java/io/netty/handler/codec/rtsp/RtspObjectDecoder.java
index e52c0ce51e..69b8ebb1f0 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/rtsp/RtspObjectDecoder.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/rtsp/RtspObjectDecoder.java
@@ -20,6 +20,8 @@ import io.netty.handler.codec.TooLongFrameException;
 import io.netty.handler.codec.http.HttpMessage;
 import io.netty.handler.codec.http.HttpObjectDecoder;
 
+import static io.netty.handler.codec.rtsp.RtspDecoder.DEFAULT_MAX_CONTENT_LENGTH;
+
 /**
  * Decodes {@link ByteBuf}s into RTSP messages represented in
  * {@link HttpMessage}s.
@@ -59,7 +61,7 @@ public abstract class RtspObjectDecoder extends HttpObjectDecoder {
      * {@code maxContentLength (8192)}.
      */
     protected RtspObjectDecoder() {
-        this(4096, 8192, 8192);
+        this(DEFAULT_MAX_INITIAL_LINE_LENGTH, DEFAULT_MAX_HEADER_SIZE, DEFAULT_MAX_CONTENT_LENGTH);
     }
 
     /**