diff --git a/MdePkg/Include/IndustryStandard/Http11.h b/MdePkg/Include/IndustryStandard/Http11.h
index d124bec37b..890bb6913b 100644
--- a/MdePkg/Include/IndustryStandard/Http11.h
+++ b/MdePkg/Include/IndustryStandard/Http11.h
@@ -146,7 +146,11 @@
 /// is a property of the message, not of the entity.
 ///
 #define HTTP_HEADER_TRANSFER_ENCODING  "Transfer-Encoding"
-
+#define HTTP_HEADER_TRANSFER_ENCODING_CHUNKED "chunked"
+#define CHUNKED_TRNASFER_CODING_CR '\r'
+#define CHUNKED_TRNASFER_CODING_LF '\n'
+#define CHUNKED_TRNASFER_CODING_LAST_CHUNK '0'
+#define CHUNKED_TRNASFER_CODING_EXTENSION_SAPERATOR ';'
 
 ///
 /// User Agent Request Header