Slim 4 - Performance Testing using Apache Bench
20 Dec 2019
Apache Bench (ab) is a great tool to test the performance of your API.
The problem is that your first test might give this strange result:
$ ab -n 1 'http://localhost/my-slim-app'
> 5.008 seconds
Of course the loading time in the browser is extremely fast, but when testing the loading time with AB you should not get a loading time < 5 seconds.
Using the switch -k (Use Keep-Alive) helps to solve the problem.
$ ab -n 1 -k 'http://localhost/my-slim-app'
> 0.100 seconds
There are two other options:
Add Connection: close to the response, e.g.
$response = $response->withHeader('Connection', 'close');
Change the HTTP version to 1.0, e.g.
$response = $response->withProtocolVersion('1.0');