Hello.

Custom URL schemes can enhance web app functionality by handling specific URLs, but detecting scheme support is tricky. Several methods exist, including click handlers, navigation handlers (Blink), and server-side redirects with meta refresh. While the server-side approach offers the most robust solution, it introduces complexity. A key challenge is the limited user understanding of custom schemes, leading to a preference for standard HTTPS URLs. This post explores a common pattern for custom scheme usage, involving detecting navigation failures and presenting alternative UI. The pattern addresses the issue of handling custom schemes like web+follow for Mastodon, aiming to improve user experience. While custom schemes are valuable developer tools, user preference for HTTPS URLs persists. Despite this, custom schemes empower developers to guide users to preferred apps or sites while gracefully handling cases where no suitable option exists. This approach also opens possibilities for other applications, like rebuilding web intents.

TL;DR - Went well. Lots to learn.

Some quick thoughts about not using CSP when you have a Service Worker.

Do you know if any ISP's are injecting Ads or anything else in to your site? No. I thought not.