Why am I getting a redirect loop when visiting the IDE web preview URL?

You might have a contributed or custom module that causes a redirect loop. Here’s a list of contributed modules that can cause this issue:

• Secure pages
• Redirect
• Global Redirect
• simpleSAMLphp Authentication

Your .htaccess file might be configured in a way that is incompatible with Cloud IDE. See redirecting visitor requests with the .htaccess file.