[图片验证码](tools/%E5%9B%BE%E7%89%87%E9%AA%8C%E8%AF%81%E7%A0%81.md)
[简单队列](tools/%E7%AE%80%E5%8D%95%E9%98%9F%E5%88%97.md)
[消息队列](tools/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97.md)
[http请求客户端](tools/http%E8%AF%B7%E6%B1%82%E5%AE%A2%E6%88%B7%E7%AB%AF.md)
[文件上传](tools/%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0.md)
[发送邮件](tools/%E5%8F%91%E9%80%81%E9%82%AE%E4%BB%B6.md)
[静态资源绑定应用](tools/%E9%9D%99%E6%80%81%E8%B5%84%E6%BA%90%E7%BB%91%E5%AE%9A%E5%BA%94%E7%94%A8.md)