Chris A. a11n

<p>Backwards Compatible Permalinks helps prevent 404 errors when switching between permalink structures.</p>
<p>It achieves this by appending a set of backwards compatible post rewrite rules. This ensures posts are still accessible at their previous permalink after the permalink structure is updated.</p>
<h4>Example</h4>
<p>Let’s say your permalink structure is set to “Month and name” and you have a post titled “I Love WordPress.” That particular post would live at <code>https://example.com/2019/03/i-love-wordpress/</code>.</p>
<p>But what if you wanted to switch to the “Post name” permalink structure and have your post live at <code>https://example.com/i-love-wordpress/</code> instead?</p>
<p>You could but this would result in the existing post permalink 404ing when visited. Which is problematic if the previous URL was bookmarked or shared on social media.</p>
<p>With Backwards Compatible Permalinks installed your post would be accessible at both the old and new permalink structures:</p>
<ul>
<li><code>https://example.com/2019/03/i-love-wordpress/</code></li>
<li><code>https://example.com/i-love-wordpress/</code></li>
</ul>
<h4>Caveats</h4>
<ul>
<li>This plugin does not work retroactively. i.e. you must have the plugin installed and activated prior to switching permalink structures before backwards compatibility will work.</li>
<li>Currently only standard posts are supported.</li>
<li>Backwards compatibility is not supported between certain permalink structure updates. This is due to a clash between permalink structure regex matching.</li>
<li>Backwards compatibility is only provided between the most recent permalink structure update. i.e. you cannot change your permalink structure 3 times and have backwards compatibility across all 3 structures.</li>
</ul>
<h4>Deactivate or uninstall</h4>
<p>After deactivating or uninstalling this plugin please ensure you visit Settings > Permalinks in the WordPress admin area to flush your rewrite rules.</p>
<h4>Contributing</h4>
<p>Contributions are <a href="https://github.com/aprea/backwards-compatible-permalinks" rel="nofollow ugc">welcomed on GitHub</a>.</p>
<h3>From within WordPress</h3>
<ol>
<li>Visit ‘Plugins > Add New’.</li>
<li>Search for ‘Backwards Compatible Permalinks’.</li>
<li>Activate Backwards Compatible Permalinks from your Plugins page.</li>
</ol>
<h3>Manually</h3>
<ol>
<li>Upload the <code>backwards-compatible-permalinks</code> folder to the <code>/wp-content/plugins/</code> directory.</li>
<li>Activate the Backwards Compatible Permalinks plugin through the ‘Plugins’ menu in WordPress.</li>
</ol>


Backwards Compatible Permalinks

Provides a degree of backwards compatibility when switching between permalink structures.

mraliende

<p>The Plugin adds an link preview box to your post.<br />
The link preview box will be displayed like in Facebook! 🙂</p>
<p>This plugin can be used for free for maximal 10 URL Preview Boxes.</p>
<p>Perhaps you are familiar with Facebook.<br />
When you write a post in Facebook and you paste an URL into your text,<br />
Facebook detects that URL and adds automatically information about that URL under your post.</p>
<p>This plugin does it not automatically, you have to use the extra button in the visual editor (“URL BOX”).<br />
Or you just write [urlpreviewbox url=”\https://….”] into your text.<br />
This plugin loads information about that URL from https://guteurls.de/ server.</p>
<ol>
<li>Title of that page</li>
<li>Description of that page</li>
<li>An URL of an image</li>
</ol>
<p>And the plugin displays it below your post.</p>
<p>Facebook supports only one preview box per post.<br />
This plugin supports many preview boxes within one post, if you want.</p>
<p>Do you want to see it live on production servers?</p>
<p>Look here (copy and paste the URLs into your browser):</p>
<p>Example web pages, who use it:</p>
<p>https://alien.de/news/</p>
<p>https://www.ufo-und-alienforum.de/index.php/Thread/30805-Verlassene-Orte-in-Baden-Württemberg/</p>
<p>https://hypnose54321.de/frankfurt/_news.php</p>
<p>:</p>
<p>HOW TO USE IT VIDEO:</p>
<p>http://www.youtube.com/watch?v=4_wIzQbPg84<br />
<span class="embed-youtube" style="text-align:center; display: block;"><iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/4_wIzQbPg84?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe></span></p>
<h3>Internationalization (i18n)</h3>
<p>Currently we have the plugin configured so it can be easily translated and the following languages supported:</p>
<ul>
<li>de_DE – German in Germany</li>
<li>en_US – English in the U.S.</li>
<li>zh_CN – China</li>
<li>es_ES – Spanish in Spain</li>
<li>ru_RU – Russian in the Russian Federation</li>
</ul>
<p>If your language is not listed above, feel free to create a translation. Here are the basic steps:</p>
<ol>
<li>Copy “gurlpb-en.pot” to “gurlpb-LANG_COUNTRY.pot” – fill in LANG and COUNTRY with whatever you use for WPLANG in wp-config.php</li>
<li>Grab a transalation editor. <a href="http://www.poedit.net/" rel="nofollow ugc">POedit</a> works for us</li>
<li>Translate each line</li>
</ol>


URL-Preview-Box

That was really needed, because the automatic URL detection failed sometimes at very different designed WordPress templates.
This is the WordPress plugin, what I exactly needed. 
I use it now and will use it in the next years for sure.

Now it is possible to add manually preview boxes

This plugin adds link preview box to your post. You just copied & pasted an URL into your posting. :-)

Backwards Compatible Permalinks vs URL-Preview-Box