rest - Apex Rest 上下文问题

Question

我需要以下帮助。我无法从这段代码中获取 case_id。我正在尝试从这段代码中获取 caseid。

RestRequest request = RestContext.request;
system.debug('********** The REQ is &&&&&&&& '+ request);
RestResponse res = RestContext.response;
String caseId = request.requestURI.substring(
request.requestURI.lastIndexOf('/')+1);
 List<IoT_Case__c> result = [SELECT Name__c,Email__c,case_Reason__c,Date_time__c,
 Facility_Name__c,Phone__c,Device_ID__c,Pool_Name__c,Address__c,IOT_Case_Type__c 
 FROM IoT_Case__c WHERE Id =:caseId];