找到IIS Express的安装目录，通常在 "C:\Program Files (x86)\IIS Express"，然后在CMD里运行
C:\Program Files (x86)\IIS Express\IisExpressAdminCmd.exe setupSslUrl -url:https://localhost:8443 -UseSelfSigned
以上就可以为你的 localhost URL 生成一张自证证书，但浏览器还未信任这张证书，想要浏览器信任它就要做以下操作:
1. 运行 -> mmc
2. 菜单 -> [File] -> [Add/Remove Snap-in...]
3. [Certificates] -> [Add >]
4. [Computer account] -> [Next]
5. [Local computer] > [Finish] -> [OK]
6. [Certificates (Local Computer)] > [Personal] > [Certificates], 选择 Firendly Name 为 “IIS Express Development Certificate” 的 localhost 证书，右键 Copy.
7. [Trusted Root Certification Authorities] > [Certificates] > 右键 > [Paste]
8. 重启浏览器，Visual Studio 重新运行你的 Program， 完！