How to avoid case-sensitive URL's in a Plesk website?

Renan Poss Moreira

Updated January 13, 2026 19:05

kb: how-to Plesk for Linux ABT: Group A

Applicable to:

Plesk for Linux

Question

How to avoid case-sensitive URLs in Plesk when:

The file index.html exists under the website example.com home directory;
The file index.html is opening correctly via the browser in the following way:

PLESK_INFO: http://example.com/index.html

while the opening of

PLESK_INFO: http://example.com/iNDeX.htML

leads to the following error

PLESK_INFO: 404 error (Not Found)

Answer

Warning: mod_speling works only for paths which are physically present on a file system and it is not compatible with websites which are using mod_rewrite to process URLs.

Use mod_speling.so Apache module:

Enable this module for a specific domain:

Log into Plesk;
Go to Domains > example.com > Apache & nginx Settings > Additional Apache directives;
Add the following rows to the fields Additional directives for HTTP and Additional directives for HTTPS:
- For Red Hat-based OSs:
  
  CONFIG_TEXT: LoadModule speling_module /usr/lib64/httpd/modules/mod_speling.so
  <IfModule mod_speling.c>
  CheckSpelling On
  CheckCaseOnly On
  </IfModule>
- For Debian-based OSs:
  
  CONFIG_TEXT: LoadModule speling_module /usr/lib/apache2/modules/mod_speling.so
  <IfModule mod_speling.c>
  CheckSpelling On
  CheckCaseOnly On
  </IfModule>
Click OK.

Enable this module for all domains:

For Red Hat-based OS's:
1. Connect to the server via SSH;
2. Create a backup of the Apache configuration file /etc/httpd/conf/httpd.conf:
  
  # cp /etc/httpd/conf/httpd.conf{,.bak}
3. Edit file /etc/httpd/conf/httpd.conf to add the following rows:
  
  # vi /etc/httpd/conf/httpd.conf
  LoadModule speling_module /usr/lib64/httpd/modules/mod_speling.so
  <IfModule mod_speling.c>
  CheckSpelling On
  CheckCaseOnly On
  </IfModule>
4. Reload the Apache service:
  
  # service httpd reload
5. Make sure that spelling module was loaded:
  
  # httpd -M | grep speling_module
  speling_module (shared)
For Debian-based OS's:
1. Connect to the server via SSH;
2. Create a backup of the Apache configuration file /etc/apache2/apache2.conf:
  
  # cp /etc/apache2/apache2.conf{,.bak}
3. Edit file /etc/apache2/apache2.conf to add the following rows:
  
  # vi /etc/apache2/apache2.conf
  LoadModule speling_module /usr/lib/apache2/modules/mod_speling.so
  <IfModule mod_speling.c>
  CheckSpelling On
  CheckCaseOnly On
  </IfModule>
4. Reload Apache service:
  
  # service apache2 reload
5. Make sure that spelling module was loaded:
  
  # apache2ctl -M | grep speling_module
  speling_module (shared)