Flex Plugins

Flex SSL is a lightweight WordPress plugin designed to secure your website by enforcing HTTPS across your entire site. Key features include:
<ul>
<li>Force HTTPS: Automatically redirect all HTTP requests to HTTPS.</li>
<li>Auto-Update URLs: Change WordPress site and home URLs from HTTP to HTTPS.</li>
<li>Cloudflare/Proxy Support: Detects HTTPS headers from Cloudflare or other reverse proxies to avoid redirect loops.</li>
<li>Security Headers: Optionally add HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy. Force SSL Admin when HTTPS is in use.</li>
<li>Mixed Content Fixer: Corrects HTTP to HTTPS in content, excerpts, thumbnails, scripts, styles, content_url, and home_url.</li>
<li>SSL Status: View current SSL status and certificate expiry date.</li>
<li>Redirect Options: Choose between 301 (permanent) and 302 (temporary) redirects.</li>
<li>Logs & Reports: Monitor changes and events in a log system.</li>
<li>Let’s Encrypt Integration (Coming Soon): Plan to automatically generate and renew SSL certificates.</li>
</ul>
<h3>License</h3>
Flex SSL is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.
For more details, see https://www.gnu.org/licenses/gpl-2.0.html.

Flex SSL

Enables SSL & forces HTTPS on WordPress, updating URLs & adding security headers. Supports reverse proxies & soon integrates Let's Encrypt.

Steve85b

Try it out on your free dummy site: Click here => <a href="https://tastewp.com/plugins/http-https-remover" rel="nofollow ugc">https://tastewp.com/plugins/http-https-remover</a>. 
(this trick works for all plugins in the WP repo – just replace “wordpress” with “tastewp” in the URL)
UPDATE: This plugin will be maintained again! It changed ownership and we’re currently collecting ideas how to further improve it. If you have any cool ideas, please let us know in Support Forum. Thank you!
Major updated in the latest release (3.0): 
– Plugin has a proper settings page now 
– Many bugs fixed 
– Code optimized, causing performance to increase a lot
Main features:
<ul>
<li>Works in Front- and Backend</li>
<li>Makes every Plugin compatible with https</li>
<li>Compatible with WPBakery & Disqus</li>
<li>Fixes Google Fonts issues</li>
<li>Makes your website faster</li>
</ul>
<h4>What does this Plugin do?</h4>
With protocol relative url’s you simply leave off the http: or https: part of the resource path. The browser will automatically load the resource using the same protocol that the page was loaded with.
For example, an absolute url may look like
<pre><code>src="http://domain.com/script.js"
</code></pre>
If you were to load this from a https page the script will not be loaded – as non-https resources are not loaded from https pages (for security reasons).
The protocol relative url would look like
<pre><code>src="//domain.com/script.js"
</code></pre>
and would load if the web page was http or https.
Tipp: Check your Settings -> General page and make sure your WordPress Address and Site Address are starting with “https”. 
Add the following two lines in your wp-config.php above the line that​ says “Stop Editing Here”:
<pre><code>define('FORCE_SSL', true);
define('FORCE_SSL_ADMIN',true);
</code></pre>
<h4>What is Mixed Content?</h4>
Mixed content occurs when initial HTML is loaded over a secure HTTPS connection, but other resources (such as images, videos, stylesheets, scripts) are loaded over an insecure HTTP connection. This is called mixed content because both HTTP and HTTPS content are being loaded to display the same page, and the initial request was secure over HTTPS. Modern browsers display warnings about this type of content to indicate to the user that this page contains insecure resources.
Note: You should always protect all of your websites with HTTPS, even if they don’t handle sensitive communications.
<h4>Example</h4>
Without Plugin: 
 src=”http://domain.com/script01.js” 
 src=”https://domain.com/script02.js” 
 src=”//domain.com/script03.js”
With Plugin: 
 src=”//domain.com/script01.js” 
 src=”//domain.com/script02.js” 
 src=”//domain.com/script03.js”
<h4>If using Cache Plugins</h4>
If the plugin isn’t working like expected please purge/clear cache for the changes to take effect!

SSL Mixed Content Fix

This is really simple plugin and easy to configure. It works fine and really useful.

Awesome Plugin

A fix for mixed content! This Plugin creates protocol relative urls by removing http + https from links. Works in Front- and Backend!

Flex SSL vs SSL Mixed Content Fix