Problem Opening Solana Test Validator on Browser

As a Solana developer, you’re likely no stranger to working with the blockchain and testing your programs on a local environment. However, when attempting to access the test validator node via the JSON RPC URL, you encounter an error that’s causing frustration. In this article, we’ll delve into the issue and explore possible solutions to resolve it.

Error Message

When opening the JSON RPC URL at the following error message is displayed:

Used HTTP Method is not allowed. POST or OPTIONS is required

• Use a server-side solution: Instead of relying on the browser to make an HTTP request to your local JSON RPC endpoint (e.g., consider using a server-side tool like Flask, Django, or Express.js to create an API endpoint that accepts POST requests for your test validator node. This will allow you to send data to the Solana validator through HTTP.

• Use a library to handle JSON-RPC in browsers: Libraries such as json-rpc-client can be used to make HTTP requests to your local JSON RPC endpoint (e.g., directly from within your browser. This will enable you to bypass the need for a server-side solution and access your test validator node using the required HTTP method.

from flask import Flask, request


app = Flask(__name__)


@app.route('/test-validator', methods=['POST'])

def handle_test_validator():

    data = request.get_json()

    
Process the data and send it to the Solana validator node

    return 'Test validator response'


if __name__ == '__main__':

    app.run(host='0.0.0.0')

Install json-rpc-client` in your project:

import { Client } from 'json-rpc-client';


const url = '

const client = new Client({

  url,

});


// Send data to the Solana validator node using POST requests

client.post('/test-validator', {

  method: 'POST',

  args: {},

  jsonrpc: '2.0',

  id: null,

})

By implementing one of these solutions, you’ll be able to access your Solana test validator node from within a browser and perform the necessary operations using the required HTTP methods.