Add a reload command

[Nothing4You]

At least nginx does require a reload to refresh the staple file.
It'd be great if it was possible to specify a reload command that is executed when a staple file is updated.

[SnijderC]

Hi,

We have a stapleadder.py module that does this for HAProxy since that is our own prime target, are you aware that nginx can do stapling on its own? There are some advantages to using a tool like this still and we could consider adding that functionality but we have no use for it. However, if you, or anyone would like contribute an additional module to cater for nginx reloading that would be great!

[Nothing4You]

Yes, I am aware that nginx can do this on its own.
The issue however when using the builtin ocsp fetcher is that it can't do preloading.
When starting up nginx it won't load the ocsp staple until it receives the first request for the host. Once it receives this request it starts loading the staple in background and will continue to serve no staple until it has a cached staple. When the staple expires it won't be refreshed until another request is received, similar to initial startup.