Previously, it was necessary to support older versions of Python for
compatibility. F-strings were released in Python 3.6. Python 3.5 was
marked as unsupported by the end of 2020, so now it's possible to start
using f-strings safely for better readability and performance.
This commit supports variable in the "share" option, the finding path to
file serve is the value from "share". An example:
{
"share": "/www/data/static$uri"
}
