Implementing mpm_event with php-fpm has broken my codeigniter app

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Hi Team,

My software: ubuntu 20.04, apache 2.4.41, php 7.4, codeigniter 3.1.16

I have an app which works fine with mpm_prefork and mod_php7.4. However, in anticipation of a lot of concurrent sessions I have just looked at improving performance and using memory more efficiently by changing to
mpm_event with php-fpm and fastcgi.

Following DigitalOcean instructions it all appeared to install ok.

apachectl -t showed Syntax OK.

I can see the socket being created (owned by www-data) and the php7.4-fpm service starts successfully.

However when I try to run my app it fails to show my home page. It does run codeigniter because it renders a screen from one of the autoloaded files. But when it gets to index.php nothing happens. I can see in the browser tools and server fpm pool
log a "GET /index.php" so something appears to be stopping it!

I read an article that suggested url rewriting was "tricky" with fastcgi and the recommended .htaccess (in docroot) is:

===================================
Options -Indexes +FollowSymLinks

RewriteEngine On
#RewriteBase /

# exclude any paths that are not codeigniter-app related
RewriteCond %{REQUEST_URI} !^/server-status
RewriteCond %{REQUEST_URI} !^/server-info
RewriteCond %{REQUEST_URI} !^/docs

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

<IfModule mod_php5.c>
    RewriteRule ^(.*)$ index.php/$1 [L]
</IfModule>

# the following is for rewritting under FastCGI
<IfModule !mod_php5.c>
    RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
============================================

Still no joy. Having run out of ideas I am seeking any advice on what I might be missing please? Hopefully it is something simple so I can take advantage of the fpm solution.

Thx Paul




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