Created by: Ricordel
In the case where we are making empty posts, use -d '' to force curl to set the Content-Length header to 0. Some backends (among which Microsoft Kestrel) are sensitive about POST without a Content-Length set.
This pull request adds a -d '' option to curl's command-line in such a situation
I don't have an extensive test setup to provide, for a simple change like this I'm not sure it's necessary. Please let me know if I should add things.
As this is bash: CC @frol, @bkryza, @kenjones-cisco