July 2019
Intermediate to advanced
480 pages
9h 35m
Chinese
Content preview from 持續交付｜使用Java
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280
| 第十章
雖然嚴格來說確實如此，但多數人都發現這種做法太難且沒價值，因而回去使用上述的
其中一種方法。因此，我們決定不在這本書中討論它，不過想要進一步研究的讀者可以
閱讀 Roy Fielding 的著作（
https://roy.gbiv.com
）。
在真正有需要時，才指定
API
版本
看完這一節之後，你可能會在每一個新端點（甚至既有的端點）前面加上
/v1
（或者，如果你選擇用內容類型來設定版本的話，改變所有端點的內
容類型）。事實上，即使你想要先做好處理 API 變動的準備，也不需要從
一開始就處理它們：如果你還要建立新服務以及做出許多決策，或許可以
延後處理版本，只要假設第 1 版代表“沒有版本”，等到（如果）你需要
處理變動時，再選擇版本系統。
多階段升級
前面的範例有服務在用戶端還沒有準備好使用新功能
之前
就提供了新功能，這意味著
你必須設法維持回溯相容性，無論是以回溯相容的方式進行變動，還是藉著建立新版的
API。你可能認為，如果你可以同時控制 API 的供應方與使用方的話，就可以繞過這種
麻煩，直接同時改變兩者，但是這種想法是錯的。
即使你可以同時改變兩者，也不保證變動可以在生產環境中同時生效。一方面，你的部
署策略可能會讓供應方的新舊版本的某段時間內，在生產環境中同時存在，如果你的用
戶端只能配合新版本，它就會在部署期間遇到嚴重的中斷。另一方面，你會在第 11 章
看到，你的變動需要經歷多個測試階段，或許那些測試對供應方而言是通過的，但是對
使用方而言不是如此（或反過來），也就是說，生產環境的供應方與使用方有版本不符 ...
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