How to map all requests except existing files to a handler - apache

Question

Need some help with htaccess rewrite rule I'm stuck with.
I have a handler index.html which is used to handle all requests except existing files.
I'm using this rule:
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.html [L]
But I have some filenames similar to the requests to be handled. If there comes a request to /main it has to be handled by index.html but because of existing file with extension - main.asdfjaskldfjaskdfjasfd.js - I'm getting 404 error insted of handling.
This problem is super easily solved in nginx with one liner: "try_files $uri $uri/ /index.html;" but I don't have an opportunity to use nginx on production - only Apache.
So I need some help with those rules.
Tried (besides tens of other) this:
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -f [OR]
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -d
RewriteRule ^ - [L]
RewriteRule ^ /index.html
Full htaccess:
RewriteEngine On
RewriteCond %{HTTP:X-Forwarded-Proto} !https
RewriteCond %{HTTPS} off
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301,NE]
# Redirect Trailing Slashes If Not A Folder...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$ /$1 [L,R=301]
# Handle Front Controller...
RewriteCond %{REQUEST_URI} ^/(demo-auth|api|oauth|password|login|logout|register|images)
RewriteRule ^ laravel.php [L]
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-d
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
RewriteRule ^ /index.html
RewriteCond %{HTTP:Authorization} .
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
Thanks in advance.

Answer 1

Add that, at the top of your htaccess, to disable MultiViews:
Options -MultiViews
The Apache docs on mod_negotiation, describes what the Multiviews Option does, when enabled:
If the
server receives a request for /some/dir/foo and /some/dir/foo does not
exist, then the server reads the directory looking for all files named
foo.*, and effectively fakes up a type map which names all those
files, assigning them the same media types and content-encodings it
would have if the client had asked for one of them by name. It then
chooses the best match to the client's requirements, and returns that
document.