apache httpd substitute wont work - apache

Question

I configured apache httpd to apply substitute.
For my eyes it is exactly what the doc says.
However it does simply nothing.
What is wrong with it?
<VirtualHost domain:443>
SSLEngine on
....
ProxyPass /cms/ http://domain2/
ProxyPassReverse /cms/ http://domain2/
Substitute "s|div|DIV|ni"
</VirtualHost>
(Apache 2.4.16 on Centos)

Answer 1

Meanwhile I figured out how to make it work
<VirtualHost domain:443>
SSLEngine on
....
# In some case the following line is neccessary
RequestHeader unset Accept-Encoding
<Location /cms >
ProxyPass http://domain2/
ProxyPassReverse http://domain2/
AddOutputFilterByType SUBSTITUTE text/html
Substitute "s|div|DIV|ni"
</Location>
</VirtualHost>
I hope this helps others to overcome similar problems.
(We use it to exchange urls from a proxied source,
after hard work apache httpd is a great tool ;-))

Answer 2

This worked for me: AddOutputFilterByType INFLATE;SUBSTITUTE;DEFLATE text/html
see https://serverfault.com/questions/843905/apache-mod-substitute-works-in-curl-but-not-on-browser?newreg=c6eab8403f83476096a3d49dd64edeeb

Answer 3

Thank you, stefan for finding the solution, I was stuck with the same issue.
For what it's worth, in my case, the back-end server is providing html but also some javascript, graphql end-point and other APIs, which required to also add other mime-types, and the final config would look like this:
<VirtualHost domain:443>
SSLEngine on
....
RequestHeader unset Accept-Encoding
<Location /cms >
ProxyPass http://domain2/
ProxyPassReverse http://domain2/
AddOutputFilterByType SUBSTITUTE text/html text/xml text/javascript application/json
Substitute "s|div|DIV|ni"
</Location>
</VirtualHost>