Return Headers for Approval Layouts
Returns only the headers that are returned by a GET request to sObject ApprovalLayouts resources. This gives you a chance to see header values before retrieving the content of the resource. This resource is available in REST API version 30.0 and later.
URI: To return headers of a request for an approval layout description for a specified object, use /services/data/vXX.X/sobjects/sObject/describe/approvalLayouts/
Formats: JSON, XML
HTTP methods: HEAD
Authentication: Authorization: Bearer token
Request parameters: None required
Example Request