Example UpdateRequest API Submission

Example UpdateRequest API Submission

I am trying to get the UpdateRequest API to work in Servicedesk Plus (Build 8.0.7) using the Servlet API. I have the AddRequest API working fine but am striggling with the Update Request.
 
The URL I am subnmitting is:
" http://localhost:8085/servlets/RequestServlet? fetching &workOrderId=116&resolution=Job Completed&technician=technician1&username=technician1&password=pa55w0rd&operation=UpdateRequest"
 
The message I am getting is Failure: workOrderId cannot be empty
 
Can someone point me in the right direction?
 
Thanks.

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