Rest Api issue (operation name GET_REQUESTS)

http://localhost:8080/sdpapi/request/?OPERATION_NAME=GET_REQUESTS&TECHNICIAN_KEY=A88FEA4D-28B4-416A-90BC-A6D5698C09F4&INPUT_DATA=<Details><operation name="GET_REQUESTS"><parameter><name>from</name><value>0</value></parameter><parameter><name>limit</name><value>5</value></parameter><parameter><name>filter by</name><value>All_Request</value></parameter></operation></Details>

Please help me get the GET_REQUEST working. As per admin guide the input parameter is not a well structured xml with a operation tag closing is missing. I tried all combination in xml to get the operation GET_REQUESTS to work but i get the following error. URL Above

  <operation name="GET_REQUESTS">
 

     
     <result>
    
      <status>
      Failed
      </status>
     
      <message>
      Error while fetching the details
      </message>
     
     </result>