apache - How to rewrite a directory to a 404 page? -

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i have hosting account, has website on it. let's call it: www.example.com
in cpanel, i've set addon domain: www.example2.com, points folder on www.example.com:
www.example.com/example2

how can throw 404 error if directly visits www.example.com/example2 ?

i've tried in .htaccess file:

options -indexes rewriteengine on options +followsymlinks rewriterule ^example2(.*) - [r=404,l,nc]

but didn't work. still shows index.php of example2 folder. both www.example.com , www.example2.com websites have own .htaccess file. if disable .htaccess file on www.example2.com, above mentioned redirect works.

inside /example2/.htaccess have rule first rule:

rewriteengine on  # if host name not example2 throw 404 rewritecond %{http_host} !^(www\.)?example2\.com$ [nc] rewriterule ^ - [l,r=404]

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