Due to a software bug in vSphere, it fails to handle ampersand in datacenter names.
The solution is to do what vSphere does (when browsing) and double-encode ampersands.
It is likely other characters need special treatment like this as well, haven't found any.
Due to a spurious newline we corrupted the payload. It depends on the order of the headers and if there were headers added by vSphere.
The Accept header was also not needed.
Brian Coca
Benno Joy
Matt Martz
Dag Wieers
Greg DeKoenigsberg
Toshio Kuratomi