diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/multipart/HttpPostRequestDecoder.java b/codec-http/src/main/java/io/netty/handler/codec/http/multipart/HttpPostRequestDecoder.java
index 7fc1b52e68..b584cecfa9 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/multipart/HttpPostRequestDecoder.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/multipart/HttpPostRequestDecoder.java
@@ -538,7 +538,7 @@ public class HttpPostRequestDecoder {
                     if (read == '&') {
                         currentStatus = MultiPartStatus.DISPOSITION;
                         ampersandpos = currentpos - 1;
-                        setFinalBuffer(undecodedChunk.slice(firstpos, ampersandpos - firstpos).copy());
+                        setFinalBuffer(undecodedChunk.copy(firstpos, ampersandpos - firstpos));
                         firstpos = currentpos;
                         contRead = true;
                     } else if (read == HttpConstants.CR) {
@@ -548,7 +548,7 @@ public class HttpPostRequestDecoder {
                             if (read == HttpConstants.LF) {
                                 currentStatus = MultiPartStatus.PREEPILOGUE;
                                 ampersandpos = currentpos - 2;
-                                setFinalBuffer(undecodedChunk.slice(firstpos, ampersandpos - firstpos).copy());
+                                setFinalBuffer(undecodedChunk.copy(firstpos, ampersandpos - firstpos));
                                 firstpos = currentpos;
                                 contRead = false;
                             } else {
@@ -561,7 +561,7 @@ public class HttpPostRequestDecoder {
                     } else if (read == HttpConstants.LF) {
                         currentStatus = MultiPartStatus.PREEPILOGUE;
                         ampersandpos = currentpos - 1;
-                        setFinalBuffer(undecodedChunk.slice(firstpos, ampersandpos - firstpos).copy());
+                        setFinalBuffer(undecodedChunk.copy(firstpos, ampersandpos - firstpos));
                         firstpos = currentpos;
                         contRead = false;
                     }
@@ -575,7 +575,7 @@ public class HttpPostRequestDecoder {
                 // special case
                 ampersandpos = currentpos;
                 if (ampersandpos > firstpos) {
-                    setFinalBuffer(undecodedChunk.slice(firstpos, ampersandpos - firstpos).copy());
+                    setFinalBuffer(undecodedChunk.copy(firstpos, ampersandpos - firstpos));
                 } else if (!currentAttribute.isCompleted()) {
                     setFinalBuffer(EMPTY_BUFFER);
                 }
@@ -586,7 +586,7 @@ public class HttpPostRequestDecoder {
             if (contRead && currentAttribute != null) {
                 // reset index except if to continue in case of FIELD getStatus
                 if (currentStatus == MultiPartStatus.FIELD) {
-                    currentAttribute.addContent(undecodedChunk.slice(firstpos, currentpos - firstpos).copy(),
+                    currentAttribute.addContent(undecodedChunk.copy(firstpos, currentpos - firstpos),
                                                 false);
                     firstpos = currentpos;
                 }
@@ -659,7 +659,7 @@ public class HttpPostRequestDecoder {
                     if (read == '&') {
                         currentStatus = MultiPartStatus.DISPOSITION;
                         ampersandpos = currentpos - 1;
-                        setFinalBuffer(undecodedChunk.slice(firstpos, ampersandpos - firstpos).copy());
+                        setFinalBuffer(undecodedChunk.copy(firstpos, ampersandpos - firstpos));
                         firstpos = currentpos;
                         contRead = true;
                     } else if (read == HttpConstants.CR) {
@@ -670,7 +670,7 @@ public class HttpPostRequestDecoder {
                                 currentStatus = MultiPartStatus.PREEPILOGUE;
                                 ampersandpos = currentpos - 2;
                                 sao.setReadPosition(0);
-                                setFinalBuffer(undecodedChunk.slice(firstpos, ampersandpos - firstpos).copy());
+                                setFinalBuffer(undecodedChunk.copy(firstpos, ampersandpos - firstpos));
                                 firstpos = currentpos;
                                 contRead = false;
                                 break loop;
@@ -688,7 +688,7 @@ public class HttpPostRequestDecoder {
                         currentStatus = MultiPartStatus.PREEPILOGUE;
                         ampersandpos = currentpos - 1;
                         sao.setReadPosition(0);
-                        setFinalBuffer(undecodedChunk.slice(firstpos, ampersandpos - firstpos).copy());
+                        setFinalBuffer(undecodedChunk.copy(firstpos, ampersandpos - firstpos));
                         firstpos = currentpos;
                         contRead = false;
                         break loop;
@@ -705,7 +705,7 @@ public class HttpPostRequestDecoder {
                 // special case
                 ampersandpos = currentpos;
                 if (ampersandpos > firstpos) {
-                    setFinalBuffer(undecodedChunk.slice(firstpos, ampersandpos - firstpos).copy());
+                    setFinalBuffer(undecodedChunk.copy(firstpos, ampersandpos - firstpos));
                 } else if (!currentAttribute.isCompleted()) {
                     setFinalBuffer(EMPTY_BUFFER);
                 }
@@ -716,7 +716,7 @@ public class HttpPostRequestDecoder {
             if (contRead && currentAttribute != null) {
                 // reset index except if to continue in case of FIELD getStatus
                 if (currentStatus == MultiPartStatus.FIELD) {
-                    currentAttribute.addContent(undecodedChunk.slice(firstpos, currentpos - firstpos).copy(),
+                    currentAttribute.addContent(undecodedChunk.copy(firstpos, currentpos - firstpos),
                                                 false);
                     firstpos = currentpos;
                 }
@@ -1648,7 +1648,7 @@ public class HttpPostRequestDecoder {
                 }
             }
         }
-        ByteBuf buffer = undecodedChunk.slice(readerIndex, lastPosition - readerIndex).copy();
+        ByteBuf buffer = undecodedChunk.copy(readerIndex, lastPosition - readerIndex);
         if (found) {
             // found so lastPosition is correct and final
             try {
@@ -1766,7 +1766,7 @@ public class HttpPostRequestDecoder {
             }
         }
         lastPosition = sao.getReadPosition(lastrealpos);
-        ByteBuf buffer = undecodedChunk.slice(readerIndex, lastPosition - readerIndex).copy();
+        ByteBuf buffer = undecodedChunk.copy(readerIndex, lastPosition - readerIndex);
         if (found) {
             // found so lastPosition is correct and final
             try {
@@ -1865,7 +1865,7 @@ public class HttpPostRequestDecoder {
                 // so go back of delimiter size
                 try {
                     currentAttribute.addContent(
-                            undecodedChunk.slice(readerIndex, lastPosition - readerIndex).copy(), true);
+                            undecodedChunk.copy(readerIndex, lastPosition - readerIndex), true);
                 } catch (IOException e) {
                     throw new ErrorDataDecoderException(e);
                 }
@@ -1873,7 +1873,7 @@ public class HttpPostRequestDecoder {
             } else {
                 try {
                     currentAttribute.addContent(
-                            undecodedChunk.slice(readerIndex, lastPosition - readerIndex).copy(), false);
+                            undecodedChunk.copy(readerIndex, lastPosition - readerIndex), false);
                 } catch (IOException e) {
                     throw new ErrorDataDecoderException(e);
                 }
@@ -1970,7 +1970,7 @@ public class HttpPostRequestDecoder {
                 // so go back of delimiter size
                 try {
                     currentAttribute.addContent(
-                            undecodedChunk.slice(readerIndex, lastPosition - readerIndex).copy(), true);
+                            undecodedChunk.copy(readerIndex, lastPosition - readerIndex), true);
                 } catch (IOException e) {
                     throw new ErrorDataDecoderException(e);
                 }
@@ -1978,7 +1978,7 @@ public class HttpPostRequestDecoder {
             } else {
                 try {
                     currentAttribute.addContent(
-                            undecodedChunk.slice(readerIndex, lastPosition - readerIndex).copy(), false);
+                            undecodedChunk.copy(readerIndex, lastPosition - readerIndex), false);
                 } catch (IOException e) {
                     throw new ErrorDataDecoderException(e);
                 }