[SCB-2338]highway should not have a default response body limit of 20M (#2588)

diff --git a/foundations/foundation-vertx/src/main/java/org/apache/servicecomb/foundation/vertx/server/TcpParser.java b/foundations/foundation-vertx/src/main/java/org/apache/servicecomb/foundation/vertx/server/TcpParser.java
index d89e8f0..9127300 100644
--- a/foundations/foundation-vertx/src/main/java/org/apache/servicecomb/foundation/vertx/server/TcpParser.java
+++ b/foundations/foundation-vertx/src/main/java/org/apache/servicecomb/foundation/vertx/server/TcpParser.java
@@ -32,8 +32,6 @@
 public class TcpParser implements Handler<Buffer> {
   public static final byte[] TCP_MAGIC;
 
-  public static final int TCP_MAX_REQUEST_LENGTH = 20 * 1024 * 1024;
-
   public static final int TCP_HEADER_LENGTH = 23;
 
   static {
@@ -102,7 +100,7 @@
         msgId = buf.readLong();
         totalLen = buf.readInt();
         headerLen = buf.readInt();
-        if (headerLen > totalLen || headerLen <= 0 || totalLen > TCP_MAX_REQUEST_LENGTH) {
+        if (headerLen > totalLen || headerLen <= 0) {
           throw new IllegalStateException("possibly attack.");
         }