Get history nodes data

const getApiNodes = async () => {

	const getBpData = async (bp, attempt = 0) => {
		if(attempt >= 3) return {bp:bp.owner, error:'no bp.json'};
		const json = await fetch(`${bp.url}/bp.json`).then(x => x.json()).catch(() => null);
		if(!json) return getBpData(bp, attempt+1);

		let ssl_endpoint, api_endpoint;
		json.nodes.map(x => {
			if(!ssl_endpoint && x.ssl_endpoint && x.ssl_endpoint.length) ssl_endpoint = x.ssl_endpoint;
			if(!api_endpoint && x.api_endpoint && x.api_endpoint.length) api_endpoint = x.api_endpoint;
		});

		if(!ssl_endpoint || !ssl_endpoint.length) ssl_endpoint = null;
		if(!api_endpoint || !api_endpoint.length) api_endpoint = null;
		return {bp:bp.owner, ssl_endpoint, api_endpoint};
	}

	const hasHistory = async data => {
		const url = data.ssl_endpoint || data.api_endpoint;
		if(!url) return 'No API Nodes';
		return fetch(`${url}/v1/history/get_key_accounts`, {
			method:"POST",
			headers: {
				'Accept': 'application/json',
				'Content-Type': 'application/json'
			},
			body:JSON.stringify({
				"public_key":"EOS7w5aJCv5B7y3a6f4WCwPSvs6TpCAoRGnGpiLMsSWbmxaZdKigd"
			})
		}).then(x => x.json()).then(res => {
			return res.hasOwnProperty('account_names') && !!res.account_names.length
		}).catch(() => false);
	}

	const corsEnabled = async data => {
		const url = data.ssl_endpoint || data.api_endpoint;
		if(!url) return 'No API Nodes';
		return fetch(`${url}/v1/chain/get_info`).then(res => {
			const cors = res.headers._headers['access-control-allow-origin'];
			return cors && cors[0] === '*';
		}).catch(err => {
			console.log('err', err);
		});
	}

	fetch(`https://nodes.get-scatter.com/v1/chain/get_table_rows`, {
		method:"POST",
		body:JSON.stringify({
			"code": "eosio",
			"json": true,
			"limit": 500,
			"scope": "eosio",
			"table": "producers"
		})
	}).then(x => x.json()).then(async res => {
		const bps = res.rows.sort((a,b) => b.total_votes - a.total_votes);
		const top50 = bps.slice(0, 21);
		const bpData = await Promise.all(top50.map(async bp => {
			const data = await getBpData(bp);
			if(data.hasOwnProperty('error')) return data;

			const result = Object.assign({hasHistory:await await hasHistory(data), hasCors:await await corsEnabled(data)}, data);
			delete result.api_endpoint;
			delete result.ssl_endpoint;
			return result;
		}));
		console.log('bpData', bpData);
	}).catch(err => {
		console.error(err);
	})
};
getApiNodes();