ReferenceError: XMLHttpRequest is not defined

[WeihanWMW]

Hi all,

I'm trying to connect to the Solana blockchain via a Deno http server.

This is my code:

import { serve } from "https://deno.land/std@0.144.0/http/server.ts";
import * as solanaWeb3 from "https://deno.land/x/solana_web3@v1.41.0-0/mod.ts";

serve(handler, { port: 8000 });

async function handler(req: Request): Promise<Response> 
{
  // Connect to Solana blockchain
  var connection = new solanaWeb3.Connection(
   solanaWeb3.clusterApiUrl('devnet'),
   'confirmed',
  );

  // Get recent blockhash
  var recentBlockhash = await connection.getLatestBlockhash();
  recentBlockhash = recentBlockhash.blockhash;
  console.log("recentBlockhash: " + recentBlockhash);

  var requestJSON = JSON.stringify({"blockhash": recentBlockhash});

  return new Response(requestJSON, {
    status: 200,
    headers: {
      "content-type": "application/json; charset=utf-8",
    },
  });
}

I run it like this:

$ deno run --allow-net ./solanaTest1.ts

But it throws this error when I try to get the recentBlockhash:

Error: failed to get recent blockhash: ReferenceError: XMLHttpRequest is not defined
    at Connection.getLatestBlockhash (https://deno.land/x/solana_web3@v1.41.0-0/web3.deno.js:19756:13)
    at async Server.handler (file:///home/configentia/study/Deno/solanaTest1.ts:48:25)
    at async Server.#respond (https://deno.land/std@0.144.0/http/server.ts:298:18)

How can I resolve this?

Best regards,
Configentia

[Ciantic]

Deno does not have functioning XMLHttpRequest by default.

You can try a polyfill

Do this before your imports:

import "https://deno.land/x/xhr@0.1.0/mod.ts";

[WeihanWMW]

Thank you Ciantic, it worked.