Filter:
/filter is a GET only call that only READER users can access.
It takes several required parameters named ?set=<files|dirs>&filters=<filter>:<filterOps>&sum=<sum>.
You may replace sum with a find if you wish. You may also perform multiple sums on the same filtered set; for example: &sum=count,diskspaceConsumed.
It also takes some optional parameters such as &limit=<number> to limit the size of the result set if you just want a small sample.
Experimentally, there are parameters for sending out an email of the response: &emailTo=<toAddress>&emailCc=<ccAddresses>&emailFrom=<fromAddress>&emailHost=<emailServerAddress>&emailConditions=<filter>:<filterOps>.
Dropping sum or find parameters entirely will output a list of paths.
Response code is 200 and either a single or multiple lines of numerical value(s) or a plaintext dump of INode paths representing the resulting set.
Response code of 403 means you are not authorized to view this endpoint.