蒸汽标签图标png是空白的

Question

以下是我的情况：我正在从Steam的游戏页面抓取HTML来收集各种游戏的标记信息。理想情况下，我会使用Steam的Web API来收集这些标签，但他们不支持这些...

所以这里是TF2的一个例子：来自http://store.steampowered.com/app/440我已经将这些标签抓取并编译成JSON：

{"steam_tags": [
  {
    "iconUrl": "http://store.akamai.steamstatic.com/public/images/v6/ico/ico_multiPlayer.png",
    "name": "Multi-player"
  },
  {
    "icon_url": "http://store.akamai.steamstatic.com/public/images/v6/ico/ico_multiPlayer.png",
    "name": "Cross-Platform Multiplayer"
  },
  {
    "icon_url": "http://store.akamai.steamstatic.com/public/images/v6/ico/ico_achievements.png",
    "name": "Steam Achievements"
  },
  {
    "icon_url": "http://store.akamai.steamstatic.com/public/images/v6/ico/ico_cards.png",
    "name": "Steam Trading Cards"
  },
  {
    "icon_url": "http://store.akamai.steamstatic.com/public/images/v6/ico/ico_cc.png",
    "name": "Captions available"
  },
  {
    "icon_url": "http://store.akamai.steamstatic.com/public/images/v6/ico/ico_workshop.png",
    "name": "Steam Workshop"
  }
]}

问题是这些直接来自HTML源的图片链接在任何浏览器中都显示为空白。

我错过了一些明显的东西吗？我觉得这不应该是困难的。