One option you might want to pursue as a quick win if your server is apache is JMeter. The beauty of it is that you can use Apache's access_logs as the input and it simulates the traffic to your application and perform assertions on the results ( status code, page size, ...).

This would serve more as an smoke testing but you can deploy that in minutes without much effort.

There is a caveat tough which is the fact that POST content doesn't get recorded in the access_logs so you won't have coverage there.