Practical notes and questions about building websites, applications, APIs, databases, and CMS platforms.
An Nginx configuration can be valid and still be wrong. A proxy rule may point to the wrong upstream, a hostname may fall into the default server, or a header may disappear from only one route. Conversely, a test can fail even when the punctuation is correct …
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Nginx returns a 502 response, and the error log mentions a Unix socket used by PHP-FPM. It is tempting to make that socket writable by ever…
A PHP request fails, but the visible clues are scattered. Nginx records a status and duration in one file. PHP records an exception somewhe…
A small PHP application may keep a generated manifest, a JSON settings file, or a tiny cache on disk. Writing one is easy. The harder quest…
A PHP application may deploy successfully on Monday and fail on Friday even when its own source code has not changed. One possible cause is…
A small PHP application can call a remote API in only a few lines. The harder question begins when the other system is slow, unreachable, o…
A single external The page delegates more than file delivery. JavaScript loaded this way runs in the page's context. The OWASP Third Part…
A PHP page fails halfway through a request. What should the visitor receive, and what should the operator keep? Those are related questions…
A form accepts a name correctly, PHP prints it correctly in a debug message, and MariaDB stores something that still looks plausible. Later…
An application release can be rolled back by checking out an earlier commit. A database is less cooperative: it contains state accumulated …
