SplitHTTP: Remove ok compatibility logic (#3753)

Remove some code that was added to maintain compatibility with older
Xray versions. This breaks compatibility with Xray-core v1.8.23 or older.

transport/internet/splithttp/dialer.go

@@ -285,13 +285,11 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
 		}
 	}()
 
-	lazyRawDownload, remoteAddr, localAddr, err := httpClient.OpenDownload(context.WithoutCancel(ctx), requestURL.String())
+	reader, remoteAddr, localAddr, err := httpClient.OpenDownload(context.WithoutCancel(ctx), requestURL.String())
 	if err != nil {
 		return nil, err
 	}
 
-	reader := &stripOkReader{ReadCloser: lazyRawDownload}
-
 	writer := uploadWriter{
 		uploadPipeWriter,
 		maxUploadSize,

transport/internet/splithttp/hub.go

@@ -196,14 +196,6 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 		h.config.WriteResponseHeader(writer)
 
 		writer.WriteHeader(http.StatusOK)
-		if _, ok := request.URL.Query()["x_padding"]; !ok {
-			// in earlier versions, this initial body data was used to immediately
-			// start a 200 OK on all CDN. but xray client since 1.8.16 does not
-			// actually require an immediate 200 OK, but now requires these
-			// additional bytes "ok". xray client 1.8.24+ doesn't require "ok"
-			// anymore, and so this line should be removed in later versions.
-			writer.Write([]byte("ok"))
-		}
 
 		responseFlusher.Flush()