Rewrite Rule Proxy¶
As of v6.0, LiteSpeed Web Server supports
ProxyPass natively. It is no longer required to set up an external app.
Versions of LiteSpeed Web Server prior to v6.0 don't support
ProxyPassReverse or other mod_proxy directives. However, you can use rewrite rules with
[P] and set up an external app of the proxy in LSWS configuration to make it work fully.
Create an External App¶
Log into the LiteSpeed WebAdmin Console at
Go to the Configuration > Server > External App tab and click Add. The external app can also be added at the virtual host level, but adding at server level is recommended.
Web Serverfrom the drop down list.
On the following page, adjust the settings and save:
Local_proxy. * Address - The IP:PORT or UDS socket of the backend server. It cannot be a domain name. For example, the frontend is on port
443, and the backend is on
ip:80, so you would enter the backend
ipwith the actual IP address. Please remember do not add "http://" or "https://" here. * Max Connections - The maximum number of concurrent connections to this Web Server at any time. * Initial Request Timeout (secs) - The maximum time in seconds the server will wait for a response. * Retry Timeout (secs) - The period of time that the server waits before retrying a request.
- After saving, restart LSWS.
Add Rewrite Rules¶
In your favorite text editor, pull up the .htaccess file and add the appropriate line(s) as shown in the examples below.
Example 1: Proxy to a site on the backend with the same domain name.¶
RewriteRule (.*) http://<EXTERNAL_APP_NAME>/$1 [P]
EXTERNAL_APP_NAME must match the name of the app created in WebAdmin. Keeping with our earlier example, that would be:
RewriteRule (.*) http://Local_proxy/$1 [P]
Example 2: Proxy to a site on the backend with a different domain name.¶
RewriteRule ^(.*)$ http://<EXTERNAL_APP_NAME>/$1 [P,E=Proxy-Host:www.example.com]
The URL for the vhost should now act as a proxy for the External App Web Server that was just set up.
Keeping with our earlier example, that would be:
RewriteRule ^(.*)$ http://Local_proxy/$1 [P,E=Proxy-Host:www.example.com]
Example 3: Proxy to a site on the same server¶
If acting as a proxy to a site on the same server, you can use
127.0.0.1:<port> without manually creating an external app. The rewrite rule proxy target will be created automatically if the target is using
127.0.0.1:<port>. When using a domain name, even if the domain is hosted on the same server, the external application won't be created automatically. This will lead to a 500 status code as the server cannot find the external application. You will need to create an external app manually, in this case.
www.example1.com is hosted on the same server. If you want to run the following proxy with domain, you will need to create an external app:
RewriteEngine On RewriteRule ^(.*)$ https://www.example1.com:5000/$1 [P,L]
Alternatively, simply using the following code, an external app will be created by the server automatically:
RewriteEngine On RewriteRule ^(.*)$ https://127.0.0.1:5000/$1 [P,L]
Example 4: cPanel webmail-like proxy¶
www.domain.com/webmail proxy loads one installation at
An Apache user without a control panel who wants to copy this behavior may achieve it with
ProxyPass, like so:
ProxyPass "/webmail/" "http://127.0.0.1/rainloop/"
But LiteSpeed doesn't support
ProxyPass in this case. Instead, a LiteSpeed user may simply use the following rewrite rule in the virtual host's Apache configuration. No need to create an external app:
RewriteRule /webmail/(.*) http://127.0.0.1/rainloop/$1 [P]
- Check the backend: Visit
http://www.example.comby curl command to make sure the backend is running ok.
- Check the frontend: Example front end is on port 443, visit
https://www.example.comand it should proxy/return the backend correctly.
Custom Request Headers¶
If you've come from the nginx world, you may be used to using
proxy_set_header. With LiteSpeed, if you need to specify custom request headers to be added to the forwarded request, you can use the
RequestHeader directive. Refer to Apache's RequestHeader documentation for details.
If you see like this:
[REWRITE] Proxy target is not defined on external application list, please add a 'web server' with name 'https://Local_proxy'
It means the proxy
Local_proxy was not defined in an external application. You need to create a web server proxy on the external application named