We need to fix this because it generated (in case of curl):
`--data "packages=Paket1\ Paket2" which would mean it tries to install a package with the name "Paket1 Paket2" (which does not work because 2 packages are meant")

Thanks Bernhard, I removed the quotes around the post parameters. This made it necessary to escape the ampersands in the wget post parameter.
In my tests installing multiple packages during host registration now worked as expected.

@ofedoren Any thoughts about the solution with removing the quotes?

Maybe I should provide some additional information 😅

Post parameters have to be provided differently for curl (one --data argument for each post parameter) and wget (one --post-data argument containing all post parameters). Initially I removed the quotes of the post parameters in the Global Registration template to unify them and when formatting the post parameters for the curl or wget command respectively I added quotes around each post parameter in the case of curl and around the whole --post-data argument in the case of wget. But by this I added quotes also to those post parameters that where not quoted before (like the packages post parameter) which is causing the described problem.
While investigating the problem with installing multiple packages, I was thinking about whether it even makes sense to quote any of the post parameters as the parameters that could cause problems are already escaped. So my new approach is to not quote the parameters and escape them correctly.