Joomla开启HTTPS后部分CSS/JS加载失败问题求助

I’ve dealt with this exact problem on multiple Joomla sites right after enabling HTTPS, so I know exactly what’s going on here.

Your symptoms—net::ERR_CONNECTION_RESET errors on some CSS/JS files, plus truncated JavaScript (like the "Uncaught SyntaxError: Unexpected end of input" on jquery.min.js that loads perfectly when you access it directly)—all stem from Joomla not recognizing that it’s running over a secure HTTPS connection. This causes mismatched protocol handling during resource delivery, leading to those weird connection and truncation issues.

The Quick Solution #

Edit your site’s .htaccess file and add the following code block:

<IfModule mod_env.c>
    SetEnv HTTPS on
</IfModule>

Why This Fixes It #

This directive tells your server to explicitly set the HTTPS environment variable to on, which Joomla uses to determine whether it should serve resources over HTTPS. Once this is set, Joomla will generate correct secure URLs for all assets and handle connections properly, eliminating the connection resets and truncated file problems you’re seeing.

内容的提问来源于stack exchange，提问作者miguelbgouveia