Web Sequence Diagrams 畫 Sequence diagram 的線上工具，介面很直觀簡單:
用以下的文字即可簡單表達一張 sequence diagram
title SIP Account server
Client -> API Server: /api/v1/users/
API Server -> Microsoft Graph Server: Check access_token
Microsoft Graph Server -> API Server: Response check result
API Server -> Client: Response SIP account info
就可以產生出以下的圖檔了:
