Title: Fix Mixed Content Errors Using .htaccess (HTTPS, Apache, CSP)
PrimaryCategory: SSL Certificates
Type: Procedural
Tags: mixed_content, https, apache, htaccess, csp, content_security_policy
Source UI Terms: None
Source Reference: Fix Mixed Content Errors Using .htaccess (HTTPS, Apache, CSP)

Prerequisites:
- Access to the website directory and permission to edit the .htaccess file
- Apache web server with mod_headers enabled

Steps:
1) Add the following line to your website directory&#39;s .htaccess file:
   ```
   Header always set Content-Security-Policy &quot;upgrade-insecure-requests;&quot;
   ```
2) Save and close the .htaccess file.
3) Clear your browser cache and reload your HTTPS website to verify that mixed content warnings are resolved.

Warnings:
- Note: Ensure that Apache&#39;s mod_headers module is enabled for the Header directive to work.
- Warning: Improper editing of the .htaccess file can cause website errors; back up the file before making changes.

Summary:
You can fix mixed content errors on your HTTPS website by adding a Content-Security-Policy header to your .htaccess file, forcing all resources to load securely over HTTPS and preventing browser warnings.

Evaluation Pairs:
Q: How can I fix mixed content warnings on my HTTPS website using Apache?
A: By adding the line `Header always set Content-Security-Policy &quot;upgrade-insecure-requests;&quot;` to your .htaccess file in the website directory.

Q: What does the &quot;upgrade-insecure-requests&quot; directive do?
A: It tells browsers to load all resources over HTTPS, automatically upgrading any HTTP requests and preventing mixed content alerts.

Q: Do I need to enable any Apache modules for this fix?
A: Yes, ensure that the mod_headers module is enabled for the CSP header to be set correctly in the .htaccess file.

When your HTTPS website shows mixed content warnings due to HTTP resources, this article explains how to fix mixed content errors using .htaccess by adding a Content-Security-Policy header on Apache servers. This ensures all resources load over HTTPS and prevents browser mixed content errors.
 
To fix any mixed content-related error on any website we just need to add one line to the website directory .htaccess file:
Header always set Content-Security-Policy &quot;upgrade-insecure-requests;&quot;
<h2>How does this help ?</h2>
&quot;Upgrade Insecure Requests&quot; is a CSP (Content Security Policy) directive that allows us to indicate to HTTP clients/browsers that all resources must be accessed via HTTPS. This allows users to migrate more easily to HTTPS websites or web apps that contain a great number of HTTP-declared resources. The application&#39;s resources will automatically be requested on HTTPS by the client/browser, without any mixed content alert.

When your HTTPS website shows mixed content warnings due to HTTP resources, this article explains how to fix mixed content errors using .htaccess by adding a Content-Security-Policy header on Apache servers. This ensures all resources load over HTTPS and prevents browser mixed content errors.