turn on on tv with cec

[rana]

i dont think im doing this right

http://192.168.0.2/jsonrpc?request={"jsonrpc":"2.0","id":1,"method":"System.Exec("echo \"on 0\" | cec-client -s")

but i get
{"error":{"code":-32700,"message":"Parse error."},"id":null,"jsonrpc":"2.0"}
what im i doing wrong?