Why does dispatch.fcgi show up in my address bar?

Question

Would love any help on this. It's confusing me!

This started happening suddenly and I'm not really sure why. When you type my website address, https://www.example.com, into the address bar it redirect to https://www.example.com/dispatch.fcgi/. What is this dispatch.fcgi and why does it show up?

My .htaccess file is as follows:

AddHandler fcgid-script .fcgi
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.
RewriteCond %{REQUEST_URI} !^/\.well-known/acme-challenge/[0-9a-zA-Z_-]+$
RewriteCond %{REQUEST_URI} !^/\.well-known/cpanel-dcv/[0-9a-zA-Z_-]+$
RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !^/\.well-known/acme-challenge/[0-9a-zA-Z_-]+$
RewriteCond %{REQUEST_URI} !^/\.well-known/cpanel-dcv/[0-9a-zA-Z_-]+$
RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
RewriteRule ^(.*)$ dispatch.fcgi/$1 [QSA,L]
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301,NE]
Header always set Content-Security-Policy "upgrade-insecure-requests;"

Answer 1

When you type my website address, https://www.example.com, into the address bar...

It's when you type HTTP://www.example.com/ (note, HTTP, not HTTPS).

This is because your directives are in the wrong order... you are redirecting to HTTPS (HTTP to HTTPS redirect) after rewriting the request to dispatch.fcgi/. Your HTTP to HTTPS redirect should be the second rule. And your first rule that redirects from non-www to www should also redirect to HTTPS as well.

In other words, your rules should look like this:

RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}/$1 [R=301,L]

RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301,NE]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ dispatch.fcgi/$1 [QSA,L]

The additional conditions (RewriteCond directives) - that I've omitted here for brevity - are required when renewing your SSL certs.

What is this dispatch.fcgi

This would seem to be your front-controller. (?)