Can I use K6 as an engine behind a Golang HTTP server? Or maybe someone has done that already? 
Thinking so that the load test can be triggered via HTTP call and maybe passing the testing script in that call too
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Hi, welcome to the forum 
Have you taken a look at k6’s REST API or the k6 pause/resume/scale/etc. commands? Here’s a good guide on how to control a running test, which should be mostly up-to-date.
It’s currently not possible to pass it a script to run as you want, but you could automate this with some shell scripting that starts k6 with k6 run --paused and then use the API or the commands to control it at runtime.
That said, while there is no support for using k6 as a library, you could write a thin wrapper that starts the execution of specific scripts received over HTTP. I wouldn’t say it’s trivial, but now with Go module support this shouldn’t be much work if you’re comfortable with Go. Take a look at how the run command works, for example.
If you do get something working, please share it with the community! I doubt this would be merged into core k6, but maybe someone else would find it useful.
HTH,
Ivan
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Thank you for the reply 
I’m planning to do the same! (making a light wrapper)