diff --git a/core/core.go b/core/core.go
index dabdee9d..ac469065 100644
--- a/core/core.go
+++ b/core/core.go
@@ -19,7 +19,7 @@ import (
 var (
 	Version_x byte = 24
 	Version_y byte = 11
-	Version_z byte = 21
+	Version_z byte = 30
 )
 
 var (
diff --git a/transport/internet/splithttp/hub.go b/transport/internet/splithttp/hub.go
index f1002018..17e1deef 100644
--- a/transport/internet/splithttp/hub.go
+++ b/transport/internet/splithttp/hub.go
@@ -159,9 +159,6 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 				errors.LogInfoInner(context.Background(), err, "failed to upload (PushReader)")
 				writer.WriteHeader(http.StatusConflict)
 			} else {
-				if request.Header.Get("Content-Type") == "application/grpc" {
-					writer.Header().Set("Content-Type", "application/grpc")
-				}
 				writer.WriteHeader(http.StatusOK)
 				<-request.Context().Done()
 			}
@@ -227,9 +224,7 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 		// teeing the response stream into their cache, causing slowdowns.
 		writer.Header().Set("Cache-Control", "no-store")
 
-		if request.Header.Get("Content-Type") == "application/grpc" {
-			writer.Header().Set("Content-Type", "application/grpc")
-		} else if !h.config.NoSSEHeader {
+		if !h.config.NoSSEHeader {
 			// magic header to make the HTTP middle box consider this as SSE to disable buffer
 			writer.Header().Set("Content-Type", "text/event-stream")
 		}