301 style htaccess redirects in Javascript for GitHub Pages

redirect.js

/**
 * 301 style htaccess redirects in Javascript for GitHub Pages.
 *
 * This simple script can be used on GitHub Pages hosted sites to handle redirects you would normally have used
 * htaccess for. In this case, a 301 redirects from an old URL path to the new URL location. Note that this does
 * not actually send 301 headers. GitHub Pages will still send a 404 header, so this is not an SEO or search 
 * engine solution, but without access to GitHub's server config, this will at least send your visitors to the 
 * correct page when browsing.
 * 
 * Usage: Include this script inside your GitHub Pages 404.html page.
 */

// This object holds all of your 301 redirects. Don't include URL parameters (?foo=bar|#anchor), they're handled automatically.
var redirects = {
  "/path/of/old/file.html": "https://yourdomain.com/path/to/new/file.html",
  "/path/of/old/file.php": "https://yourdomain.com/path/to/new/file.html"
};

// Get the URL requested in the browser
var url = redirects[location.pathname];

// Perform the redirect
if (typeof url !== "undefined") location.href = url + location.search + location.hash;