Reverse Proxy PHP Issue Demonstration

This repo contains code to demonstrate an issue where a healthcheck returns slowly because of code in other places taking a long time.

slow.php connects via curl to a local HTTP server and makes a request that intentionally doesn't return for 5s.

The load service in the Dockerfile generates a load on the slow.php file.

Eventually the load created overwhelms the PHP-FPM workers and subsequent requests to the healthcheck at health.php fail to respond within the 3 second timeframe of the reverse proxy.

docker-compose up

New tab/window:

time docker-compose run --rm healthcheck

Should see healthcheck return "ok" < 1s

Generate fake load:

docker-compose run --rm -d load

time docker-compose run --rm healthcheck

Should see healthcheck return > 3s