Add support for redirect links.

[notnotrachit]

Not working for redirect links. eg. https://discordgift.site/Tr35II4R39SsCjrT

[PGgamer2]

Initially I wanted to use fetch because there's an option for link redirection

fetch("https://discordgift.site/Tr35II4R39SsCjrT", { method: 'GET', redirect: 'follow'})
	.then(response => {
		console.log(response.url);
	})
	.catch(function(err) {
		console.info(err);
	});

However it doesn't work because of the CORS policy.
The only solution would be to use a server-side method, and GitHub Pages doesn't support it.

[JoshAtticus]

If you had the code for a server, I can host one for you. I've got an always-on computer dedicated to hosting servers.

[PGgamer2]

Well, I just checked what https://discordgift.site/Tr35II4R39SsCjrT really does.
By GETting this URL you don't obtain a 30x redirection response code, but an HTML page that instantly redirects you to YouTube using JavaScript and, at the same time, an HTML meta tag called http-equiv. This means that fetch, XMLHttpRequest, request, etc. can't detect that this link has any type of redirection.
To detect if a URL like this one redirects to a rickroll we would need to do one of the following:

• Check if the HTML document contains the YouTube URL. This could easily fail if the link is encrypted and then decrypted on runtime.
• Run the JS code and wait for the redirection. This is potentially dangerous if a user inputs a URL with malicious JS code.

[JoshAtticus]

Run the JS code and wait for the redirection. This is potentially dangerous if a user inputs a URL with malicious JS code.

The computer runs everything in a sandbox on top of linux, so I don't think that security is an issue.