The $filter System Query Option is used to filter resource collections to return a subset of resources in a response. The subset includes only the resources that satisfy conditions specified in the query.
For example, to return a list of recovery locations for which the storage usage threshold is set to 80%, send the following request:
To get a representation of a recovery location with the specified ID, send the following request:
The $filter system query option supports a set of built-in filter operations and functions that can be used within these operations. For the full description of the syntax used for building requests, see the [OData-URL] syntax rule.