email.go:再重新写回请求体body中，ioutil.ReadAll会清空c.Request.Body中的数据 (#1027)

Co-authored-by: oldlv <15237336850@163.com>

server/middleware/email.go

@@ -1,6 +1,7 @@
 package middleware
 
 import (
+	"bytes"
 	"io/ioutil"
 	"strconv"
 	"time"
@@ -32,6 +33,8 @@ func ErrorToEmail() gin.HandlerFunc {
 			username = user.Username
 		}
 		body, _ := ioutil.ReadAll(c.Request.Body)
+		// 再重新写回请求体body中，ioutil.ReadAll会清空c.Request.Body中的数据
+		c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(body))
 		record := system.SysOperationRecord{
 			Ip:     c.ClientIP(),
 			Method: c.Request.Method,