To allow FormPost actions on your Cloud Files account, you must first set the
metadata header
X-Account-Meta-Temp-URL-Key on your Cloud Files account to a key that
only you know. This key can be any arbitrary sequence as it is
for encoding your account.
Once the key is set, you may not change it while you still want others to access your account. If you change it, the actions from a FormPost become invalid (within 60 seconds, which is the cache time for a key).
Example 6.7. Set Account Metadata Key for Public Access
POST /<api version>/<account> HTTP/1.1
Host: storage.clouddrive.com
X-Auth-Token: eaaafd18-0fed-4b3a-81b4-663c99ec1cbb
X-Account-Meta-Temp-Url-Key: <your key>
Any 2xx response indicates success.
