Passing a URL instance with a CONNECT method results in an invalid path

• Version: >=v10.21.0
• Platform: Linux solus 5.6.18-156.current #1 SMP PREEMPT Sun Jun 21 07:16:38 UTC 2020 x86_64 GNU/Linux
• Subsystem: http, https, url

What steps will reproduce the bug?

const http = require('http');

const server = http.createServer();

server.on('connect', (request, stream) => {
	console.log(request.url);
	stream.end('HTTP/1.1 501 Not Implemented\r\n\r\n');
});

server.listen(error => {
	if (error) {
		throw error;
	}

	const url = new URL(`http://localhost:${server.address().port}/example.com`);

	const request = http.request(url, {method: 'CONNECT'}).end();
	request.once('connect', response => {
		response.destroy();

		server.close();
	});
});

How often does it reproduce? Is there a required condition?

Always.

What is the expected behavior?

example.com

What do you see instead?

/example.com

Additional information

There is a workaround for this:

-const request = http.request(url, {method: 'CONNECT'}).end();
+const request = http.request({
+	hostname: url.hostname,
+	port: url.port,
+	path: 'example.com',
+	method: 'CONNECT'
+}).end();

/cc @yovanoc

Start by running the provided Node.js reproduction using http.request, a URL instance, and the CONNECT method. Trace the HTTP client URL handling and inspect existing tests for CONNECT requests. Done means the server receives example.com rather than /example.com, with a regression test covering the behavior.