Golang line flexbox

line.go

import "github.com/line/line-bot-sdk-go/linebot"

func reply(replyToken string) error {
    container := &linebot.BubbleContainer{
        Type: linebot.FlexContainerTypeBubble,
        Body: &linebot.BoxComponent{
            Type:   linebot.FlexComponentTypeBox,
            Layout: linebot.FlexBoxLayoutTypeHorizontal,
            Contents: []linebot.FlexComponent{
                &linebot.TextComponent{
                    Type: linebot.FlexComponentTypeText,
                    Text: "Hello,",
                },
                &linebot.TextComponent{
                    Type: linebot.FlexComponentTypeText,
                    Text: "World!",
                },
            },
        },
    }
    if _, err := client.ReplyMessage(
        replyToken,
        linebot.NewFlexMessage("alt text", container),
    ).Do(); err != nil {
        return err
    }
    return nil
}

ref: https://engineering.linecorp.com/ja/blog/detail/348