HTTP to HTTPS Redirector

Automatically redirect HTTP pages to their HTTPS equivalent. Smartly ignores local networks.

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// ==UserScript==
// @name         HTTP to HTTPS Redirector
// @namespace    SFRUUCB0byBIVFRQUyBSZWRpcmVjdG9y
// @version      1.1
// @description  Automatically redirect HTTP pages to their HTTPS equivalent. Smartly ignores local networks.
// @author       smed79
// @license      GPLv3
// @icon         https://i25.servimg.com/u/f25/11/94/21/24/https11.png
// @match        http://*/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // 1. Double-check we are actually on HTTP
    if (window.location.protocol !== 'http:') {
        return;
    }

    // 2. Ignore local networks, routers, and localhost environments
    // This prevents breaking access to 192.168.x.x routers and local development servers
    const host = window.location.hostname;
    const isLocalNetwork = /^(localhost|127\.0\.0\.1|192\.168\.\d+\.\d+|10\.\d+\.\d+\.\d+|172\.(1[6-9]|2[0-9]|3[0-1])\.\d+\.\d+|\[::1\])$/.test(host);
    
    if (isLocalNetwork) {
        return;
    }

    // 3. Construct the HTTPS URL safely
    // Substring(5) strips the "http:" part perfectly every time
    const httpsUrl = "https:" + window.location.href.substring(5);

    // 4. Redirect using replace() so we don't break the browser's "Back" button
    try {
        window.location.replace(httpsUrl);
    } catch (error) {
        console.error('Failed to redirect to HTTPS:', error);
    }
})();