"handleHttps" Will cause connection leaks

[lujinda]

		if targetOK && clientOK {
			go copyAndClose(ctx, targetTCP, proxyClientTCP)
			go copyAndClose(ctx, proxyClientTCP, targetTCP)
		}

If the client actively closes the connection, and the remote server does not write any data, and the inactivity timeout is not configured. At this time, only the first copyAndClose will end (io.EOF occurs on the client).

[ErikPelli]

Can you open a pull request to fix this issue?

[ErikPelli]

Fixed by #256