特殊页面支持请求变量

internal/utils/reader_utils.go

@@ -0,0 +1,25 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package utils
+
+import "io"
+
+func CopyWithFilter(writer io.Writer, reader io.Reader, buf []byte, filter func(p []byte) []byte) (written int64, err error) {
+	for {
+		n, err := reader.Read(buf)
+		if n > 0 {
+			n2, err := writer.Write(filter(buf[:n]))
+			written += int64(n2)
+			if err != nil {
+				return written, err
+			}
+		}
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return written, err
+		}
+	}
+	return written, nil
+}