docker download: 使用docker容器启动go程序，程序中包含导出excel的接口。访问接口导出空文件。

[poscergx]

	r.GET("/json", func(c *gin.Context) {
		f := excelize.NewFile()
		sheet1 := "eat food"
		f.SetSheetName("Sheet1", sheet1)
		f.SetCellValue(sheet1, "C3", "are you eat")
		f.SetCellValue(sheet1, "D4", "are you hungry")
		buffer, _ := f.WriteToBuffer()
		c.Writer.Header().Add("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, "eat.xlsx"))
		c.Writer.Header().Add("Content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
		a, _ := c.Writer.Write(buffer.Bytes())
        }

代码如上，访问json接口下载名为eat.xlsx的文档，下载xlsx的文档文件名和sheet1名称符合预期，但是内容为空。请教一下原因为何？
以下是dockerfile内容

FROM golang:latest
ENV GOPROXY https://goproxy.cn,direct
WORKDIR $GOPATH/home/test
COPY . $GOPATH/home/test
RUN go build .
EXPOSE 9090
ENTRYPOINT ["./m"]

以下是docker的构建和启动命令：
docker build -t gin-test .
docker run --privileged -d --name gin_test -p 9090:9090 gin-test

[xuri]

Thanks for your issue. Which version of the Go language and Excelize library are you using? Could you follow the issue template and provides more details about this?

[poscergx]

补充：
go version go1.19.4 linux/amd64
github.com/gin-gonic/gin v1.9.1
github.com/xuri/excelize/v2 v2.8.0

[xuri]

Thanks for your feedback, could you show us a complete, standalone example program or reproducible demo?

[poscergx]

这是一个demo，所以项目下只有main.go一个文件
main.go完整代码如下

package main

import (
	"github.com/gin-gonic/gin"
	"github.com/xuri/excelize/v2"
)

func main() {
	r := gin.Default()

	r.GET("/json", func(c *gin.Context) {
		f := excelize.NewFile()

		sheet1 := "eat food"
		f.SetSheetName("Sheet1", sheet1)
		f.SetCellValue(sheet1, "C3", "are you eat")
		f.SetCellValue(sheet1, "D4", "are you hungry")

		buffer, _ := f.WriteToBuffer()
		c.Writer.Header().Add("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, "eat.xlsx"))
		c.Writer.Header().Add("Content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
		a, _ := c.Writer.Write(buffer.Bytes())

	})

	r.Run(":9090")

}

[xuri]

I've tested with your code and it works well. Please make sure you're not using Go 1.21.0. Also reference issues #1465, #1595, #1603, #1608, #1614, #1619, #1620, #1621, #1623, #1633, #1637, #1641, #1642, #1648, #1651 and #1652.

[poscergx]

Your suggestion was helpful, thank you👍