Explainer
Get a filename without its extension in Python
Use Path.stem or splitext to remove the final suffix, and handle compound extensions without damaging hidden filenames.
Technical guide
Get the current Git branch name
Read the current branch with git branch --show-current or symbolic-ref, and handle detached HEAD correctly in scripts and CI.
Explainer
Troubleshoot Nginx FastCGI 504 timeouts with PHP-FPM
Identify the timeout that fired, inspect PHP-FPM slow requests, and align application deadlines without hiding pool exhaustion.
Technical guide
Route subdomains to different ports on one server
Configure Apache or Nginx to proxy each hostname to a different backend port, including forwarding headers, WebSockets, DNS, and TLS.
Explainer
Choose an Apache MPM: event, worker, or prefork
Choose event for a compatible threaded Apache deployment, retain prefork for modules that require it, and size concurrency against measured resource use.
Explainer
Write OR conditions in PromQL
Use regex alternatives for label values and vector set operators for query results, with explicit matching when needed.
Explainer
Get label values from Prometheus
List labels with Grafana or the HTTP API, expose them in query results, and attach metadata with correctly directed vector matching.
Technical guide
How Apache ServerName and ServerAlias select a virtual host
Understand Apache virtual-host matching, default-host order, wildcard aliases, and the separate roles of TLS SNI and HTTP Host.
Explainer
Pass parameters to pytest fixtures
Parameterize fixtures directly, pass values indirectly from tests, and register command-line options for configurable test setup.
Technical guide
Send an HTTP POST request from Node.js
Send JSON with fetch, the built-in HTTP modules, or Axios, while handling status codes, response bodies, and timeouts explicitly.
Explainer
Log an exception with its traceback in Python
Use logger.exception or exc_info to preserve exception tracebacks, and configure a hook for uncaught main-thread exceptions.
Explainer
Parse nested JSON fields in Fluentd
Distinguish JSON objects from JSON-encoded strings, parse an inner field, preserve context, and handle invalid records explicitly.