Allow variability between requests

[dwt]

Hi there,

we have a server that requires an idempotency key as a header and will just return the same canned response if you ask twice for the same idempotency key.

To performance stress test the server, and not just the idempotency logic, I need to have a different header for each request.

This does not seem possible with hey yet.

1. Am I missing something?
2. Should I be using a different tool? I know that I can stuff like this with Locust, but it is such a pain in the a* to setup for quick and simple tests.
3. What do you think about the ability for hey to call a small script to modify / transform each request?
4. I would also be fine to provide a file with one line per request to fill in for the header value.
5. Perhaps the simplest way (for me as a user) would be to allow me to just call a shell tool inside a template string and have hey execute that for each request. Something like hey -H 'Idempotency-Key: ${uuidgen}' that is not evaluated by the shell, because of the ' (single quotes) but the ${} could be the key for hey to call out to uuidgen for each request.