Smooth Theme Switch Implementation Challenges

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The chapter explores the difficulties of achieving a seamless theme switch on a website, evaluating options like a flash of unthemed content while debating between client-side and server-side solutions. It highlights the importance of ensuring the correct theme application from the initial render to prevent any unwanted flashes of the wrong theme and discusses the benefits of disabling SSR in projects where it's unnecessary.

Scott and Wes dive into the cache problem, tackling user-specific data and caching security. From marketing A/B testing to content negotiation, they explore various challenges and solutions, including different URL/query parameters, edge logic, and client-side caching.

Show Notes

00:00 Welcome to Syntax!
01:22 Syntax is on YouTube.
02:16 Let’s talk about the cache problem.
03:33 User-specific data and caching security.
06:27 Why might this pop up?
- 06:29 Marketing A/B testing - cookie based.
- 06:55 User-selected features - such as themes.
- 06:58 Language or geo-based items - accept language.
- 07:11 Images - WebP for some browsers, jpg for others.
- 07:45 JSON/HTML based on accept header.
- 08:17 Different encoding.
08:26 Content negotiation.
08:54 The solutions.
- 09:04 Provide different URLs/Query parameter.
- 11:19 Don’t cache the page, cache the data based on query.
- 15:01 Implement a “Cache Key” - one render for every option.
- Netlify
- Fastly
- Cloudflare
- 18:17 Use edge logic.
- 19:52 Just do it client-side.