This post discusses the use of gin.Context and gin.Context.Copy() in Go Gin for downloading files. When using c.Copy(), it creates a copy of the context, including request and response information, but does not copy the request body. Therefore, if attempting to read the request body in the download function, it will not be able to retrieve the data. To fix this issue, the original context object c should be passed directly to the download function instead of using c.Copy().

Go Gin *gin.Context VS gin.Context.Copy()

Gin Tag提供了多种验证字段值的方法，包括验证业务标识代码、语言标签、比特币地址、信用卡号码、MongoDB的ObjectID、Cron表达式、日期时间、电子邮件地址、以太坊地址、国际标准书号、ISO国家代码、JSON格式、JWT、Luhn算法校验和、纬度、经度、社会安全号码、时区、通用唯一标识符、哈希值、语义化版本号、有序可排序的唯一标识符等。此外，还提供了比较和其他验证方法，如验证目录、文件、图像文件等。参考文档：https://github.com/go-playground/validator。