gin bodyの内容を取得

func (f Form) Create(c *gin.Context) {
    ctx := appengine.NewContext(c.Request)
    c.Request.ParseForm()
    for k, v := range c.Request.Form {
        log.Debugf(ctx, k)
        log.Debugf(ctx, v[0])
    }
    c.String(200, "posted")
}