When you use a URL to pass commands you need to use the Web Service URL
reportserver path in the URL not the web portals URL.
If you run the Reporting Services Configuration Manager and look under "Web Service URL" you see a different address.
By default the web portal (SSRS home page as you called it) will be at http://myServer/Reports
But the Web Service URL by default is
http://myServer/Reportserver
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