This project forked from puzzledalien/captcha
.net core Captcha Service webapi 验证码
项目中包含一个页面，运行之后，可访问路由“/Index”，进行自测，页面如下图所示
嵌入图片，部署之后访问“/captcha”，可直接加载一张图片
接口:
1、api/captcha ：返回图片byte[]
2、api/captcha/verify：校验验证码
如果运行在Windows环境，是完成ok的。System.Drawing.Common是完美的解决方案。
如果现在你想要部署在Ubuntu或者Docker环境下，你需要安装 对应平台的 GDI +相关依赖项。
Ubuntu需要安装的依赖库如下
sudo apt install libc6-dev
sudo apt install libgdiplus
.Net Core图形处理开源组件有更多选项，下一步计划都试一试
尝试.Net Core 2.2，将Captcha独立成.Net Standard类库，并借助微软自带DI解耦CaptchaFactory
计划2已完成
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