If you are running your site under an SSL certificate (which you should be) but are using non-ssl http urls in the rewrite and redirect rules of your Joomla site's .htaccess file, you are actually adding to the page load speed of your site. Why this is true, and how to gain back that lost speed for your Joomla site is the topic of today's Maintenance Monday live stream.
If you open a Joomla article and see an error notification that says "Unable to load user with ID: [some number]" or you have a number of articles in the articles manager that "none" is the author of, you probably have some missing or deleted users or at some time in the past your site existed in a much older version Joomla and has been updated. Regardless of the cause, you need to fix the incorrect or missing authors in those articles. How to fix incorrect or missing authors in Joomla articles is what today's Maintenance Monday live stream is all about.
If you are really stuck when working on your Joomla site, ask for help! Some of the best ways and best places to ask for help with your Joomla site is what today's Maintenance Monday live stream is all about.
If you have changed the structure of your Joomla site and you have lots of URLs to "redirect", use Regex in the rewrites in your .htaccess file. It will save you a ton of time repairing broken links one at a time. How to use Regex in the .htaccess rewrites of your Joomla site is what today's Maintenance Monday live stream is all about.
As you can read in the post installation message that is new as of Joomla 3.9.3, "Since Joomla 3.9.3, Joomla is shipped with additional security hardenings in the default htaccess.txt and web.config.txt files. These hardenings disable the so called MIME-type sniffing feature in webbrowsers. The sniffing leads to specific attack vectors, where scripts in normally harmless file formats (i.e. images) will be executed, leading to Cross-Site-Scripting vulnerabilities.
The security teams recommends to manually apply the necessary changes to existing .htaccess or web.config files, as those files can not be updated automatically." How to manually apply these necessary changes to prevent browsers from sniffing your Joomla site is what today's Maintenance Monday is all about.