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I would like to add custom RPC method to geth. I found this question: How to add a custom JSON-RPC endpoint to geth?. But it does not work...

What I did:

1. https://github.com/ethereum/go-ethereum
2. Modified `go-ethereum/internal/ethapi/api.go` file adding new function. 
3. Run docker build --pull --rm -f "Dockerfile" -t goethereum:latest "."

Now I have image, from this image I have created docker-compose.yml to run network with one bootnode and one miner. Calling from Postman:

POST|GET http://localhost:8545
{
    "jsonrpc": "2.0",
    "method": "eth_myMethod",
    "params": [
        "Hello world!"
    ],
    "id": 1
}

But for the response I get:

{
    "jsonrpc": "2.0",
    "id": 1,
    "error": {
        "code": -32601,
        "message": "the method eth_myMethod does not exist/is not available"
    }
}

Is there any line of code I need to add in order to register this new method to be available trough JSON RPC API?

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