RPC server responds with error if request params is empty array

[sreuland]

What version are you using?

0.7.0

What did you do?

curl --location 'http://localhost:8000/soroban/rpc' \
--header 'Content-Type: application/json' \
--data '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getNetwork",
    "params": []
}'

What did you expect to see?

{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "friendbotUrl": "http://localhost:8000/friendbot",
        "passphrase": "Standalone Network ; February 2017",
        "protocolVersion": "20"
    }
}

What did you see instead?

{
    "jsonrpc": "2.0",
    "id": 1,
    "error": {
        "code": -32602,
        "message": "invalid parameters: [-32602] invalid parameters"
    }
}

Noticed will get error response on other rpc methods(getHealth, getLatestLedger) that don't require params also, slightly different error message in some cases.

Made a defensive change to handle this from js client side -
stellar/js-soroban-client#70

[sreuland]

closing as duplicate - stellar/stellar-rpc#40