A missing page can come from an old bookmark, a typo, or a link that once pointed somewhere useful. The Smart 404 project makes those misses visible and provides a way to handle them deliberately.
The handler logs the requested path, checks configured mappings, and can attempt conservative matching against hosted project paths. A protected administration page lets an administrator inspect the misses and create a site-local mapping from a log entry or a manual form.
The word conservative matters. A redirect is only helpful when it sends someone to the right place. Automatically treating every unfamiliar address as a near match would create a different kind of confusion. The documentation keeps new mappings temporary while they are being tested.
There is also a routing detail specific to jasr.me. YOURLS handles shortlink requests, including unknown keywords, before a normal web-server error document necessarily gets involved. The project includes a plugin to pass those unknown keywords into the Smart 404 workflow.
The administration view can classify recurring unwanted request patterns, with exact, prefix, and contains matches. Those patterns are handled separately from ordinary recovery mappings. This provides visibility into the requests; it is not a claim that a 404 handler replaces a broader security system.
Live logs, mappings, and the administrator password configuration are managed separately from the source files. Fixing a routing bug should not wipe out the useful mappings already collected on the server.
The appeal is turning a dead end into a maintainable feedback loop: see what people request, decide what should happen, and keep the decision explicit enough to revisit later.
Update history
These notes record article updates associated with repository changes. The original publication date is retained.
- — Converted automated article narration to neutral third person and added public update history. No application functionality changed. GitHub source