JordiPlana

This plugin hooks the normal WordPress workflow in order to determine if the request is processing will cause a 404 HTTP error. In that case it prevents WordPress to do any other processing and sends the user to the page defined in the plugin options.
A working and simple solution.
For more information about this plugin you can check <a href="http://jordiplana.com/404-simple-redirect-plugin-for-wordpress" title="404 Simple Redirect Plugin for WordPress" rel="nofollow ugc">the official page</a>.

404 Simple Redirect

This plugin hooks the normal Wordpress workflow in order to determine if the request is processing will cause a 404 HTTP error.

florianluce

With WP htaccess Optimize, you can easily optimize the performance of your site by configuring your htaccess in bit clicks
optimisation available:
<ul>
<li>Time zone selection</li>
<li>Prevents indexing of folders without index.php</li>
<li>Disable the server signature</li>
<li>Block Sensitive Files</li>
<li>Protect WP-includes</li>
<li>Protect author link</li>
<li>Block author scans</li>
<li>Enabling the tracking of symbolic links</li>
<li>Comment spam</li>
<li>Protection against file injections</li>
<li>Various protections ( XSS, clickjacking and MIME-Type sniffing )</li>
<li>Disable the hotlinking of your pictures</li>
<li>Redirect without WWW</li>
<li>Redirect http to HTTPS</li>
<li>Caching files in the browser</li>
<li>Disabled headers ETags</li>
<li>Compress static files</li>
</ul>

WP htaccess Optimize (beta)

simply configure your htaccess to optimize your site!

404 Simple Redirect vs WP htaccess Optimize (beta)