Why I got " Module provided in the request is not supported. " ?

Why I got " Module provided in the request is not supported. " ?

Hello Sir

When I Access this Website 

http://<My IP>:8080/sdpapi/change/208?OPERATION_NAME=GET&TECHNICIAN_KEY=xxxxx

( I want to use  php file_get_contents() in this website )

and I got this error 

<operation name="GET">
<result>
<status> Failed </status>
<message> Module provided in the request is not supported. </message>
</result>
</operation>

I use Sevice Desk version    8.3  Build  8311

Thank you Very much
Chatchawan U-patham
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