diff --git a/plugin/protocol/http2/src/http2_common.cpp b/plugin/protocol/http2/src/http2_common.cpp
index ef2ad56..f4b7007 100644
--- a/plugin/protocol/http2/src/http2_common.cpp
+++ b/plugin/protocol/http2/src/http2_common.cpp
@@ -38,9 +38,9 @@ Http2Plugin *http2_plugin()
 int
 http2_header_str_to_val(const char *str, const char * map[], unsigned int map_size)
 {
-	for (unsigned int i = 1; i < map_size; i++)
+	for (unsigned int i = 2; i < map_size; i++)
 	{
-		if (!strncasecmp(str, map[i], strlen(map[i])))
+		if ( (strlen(str) == strlen(map[i])) && !strncasecmp(str, map[i], strlen(map[i])))
 		{
 			return i;
 		}
@@ -48,7 +48,7 @@ http2_header_str_to_val(const char *str, const char * map[], unsigned int map_si
 
 	// in http  [TFE_HTTP_UNKNOWN_FIELD] = NULL;      [TFE_HTTP_HOST] = "Host",
 	// in http2 [TFE_HTTP_UNKNOWN_FIELD] = "unknown"; [TFE_HTTP_HOST] = ":authority"
-	if (!strncasecmp(str, ":authority", strlen(":authority")))
+	if ( (strlen(str) == strlen(":authority")) && !strncasecmp(str, ":authority", strlen(":authority")))
 	{
 		return TFE_HTTP_HOST;
 	} else {
diff --git a/plugin/protocol/http2/src/http2_stream.cpp b/plugin/protocol/http2/src/http2_stream.cpp
index 08d85cd..2f88dba 100644
--- a/plugin/protocol/http2/src/http2_stream.cpp
+++ b/plugin/protocol/http2/src/http2_stream.cpp
@@ -760,7 +760,6 @@ nghttp2_frame_submit_built_resp(struct tfe_h2_stream *h2_stream_info,
 	if (rv != 0){
 		return ACTION_FORWARD_DATA;
 	}
-	delete_nv_packet_data(h2_header);
 
 	return ACTION_DROP_DATA;
 }
@@ -805,7 +804,6 @@ nghttp2_frame_submit_built_req(struct tfe_h2_stream *h2_stream_info,
 					  nghttp2_strerror(stream_id));
         return ACTION_FORWARD_DATA;
     }
-	delete_nv_packet_data(h2_header);
 
 	return ACTION_DROP_DATA;
 }
@@ -1195,7 +1193,6 @@ nghttp2_submit_header_by_not_modify(struct tfe_h2_stream *h2_stream_info,
         printf("Fatal headers error: %s\n", nghttp2_strerror(stream_id));
 		stream_action = ACTION_FORWARD_DATA;
     }
-	delete_nv_packet_data(&headers);
 
 	if (stream_action == ACTION_DROP_DATA){
 		xret = nghttp2_session_send(h2_stream_info->as_server);
@@ -1385,7 +1382,6 @@ nghttp2_server_frame_submit_push_promise(struct tfe_h2_stream *h2_stream_info,
     }
 	upstream_create_req(h2_stream_info, h2_stream_info->as_server, peer_h2_stream, stream_id);
 	/*clean header message **/
-	delete_nv_packet_data(headers);
 	stream_action = ACTION_DROP_DATA;
 finish:
 	return stream_action;
@@ -1594,7 +1590,6 @@ nghttp2_server_frame_submit_header(struct tfe_h2_stream *h2_stream_info,
     if (xret < 0){
         printf("Fatal headers error: %s\n", nghttp2_strerror(xret));
     }
-	delete_nv_packet_data(headers);
 
 	return stream_action;
 }
@@ -1778,7 +1773,6 @@ nghttp2_client_frame_submit_header(struct tfe_h2_stream *h2_stream_info,
     }
 	stream_action = ACTION_DROP_DATA;
 finish:
-	delete_nv_packet_data(headers);
 	return stream_action;
 }
 
@@ -1874,7 +1868,7 @@ nghttp2_fill_up_header(nghttp2_session *ngh2_session, const nghttp2_frame *frame
 		TFE_LOG_ERROR(logger()->handle, "Header stream id %d, can't find stream information",
 													 frame->hd.stream_id);
 		return 0;
-	}
+	}	
 	struct tfe_h2_half_private *half = (dir == CONN_DIR_UPSTREAM) ? h2_session->resp : h2_session->req;
 
 	struct http_field_name field;