CORS proxy on Cloudflare Workers https://cors-everywhere.tabjy.com/

cors-everywhere.js

/**
 * @typedef {Object} Env
 */
export default {
	/**
	 * @param {Request} request
	 * @param {Env} env
	 * @param {ExecutionContext} ctx
	 * @returns {Promise<Response>}
	 */
	async fetch(request, env, ctx) {
		const url = new URL(request.url)

		if (url.pathname === '/') {
			return new Response(`Usage: ${url.origin}/<your-url-here>\nExample: ${url.origin}/https://www.cloudflarestatus.com/api/v2/summary.json\n\nMIT License, source code at ${url.origin}/source`, {
				status: 200,
				headers: {
					'content-type': 'text/plain'
				}
			})
		}

		try {
			return await this.proxy(request)
		} catch (err) {
			return new Response(err.stack + '\n\n' 
								+ 'export default {\n' + Object.keys(this)
									.filter(k => k !== 'middleware')
									.filter(k => typeof this[k] === 'function')
									.map(k => '\t' + this[k].toString())
									.join(',\n\n')
								+ '\n}', {
				status: 400,
				headers: {
					'content-type': 'text/plain'
				}
			})
		}
	},

	async proxy(request) {
		const url = new URL(request.url)
		const target = new URL(url.pathname.slice(1) + url.search)
		const response = await fetch(target, {
			method: request.method,
			headers: new Headers([...request.headers.entries()].filter(entry =>
				!entry[0].startsWith('cf-') && !entry[0].startsWith('sec-') && !entry[0].startsWith('proxy-'))),
			body: request.body
		});

		const modifiedResponse = new Response(response.body, response)
		modifiedResponse.headers.set("Access-Control-Allow-Origin", "*")

		return modifiedResponse
	}
}