.htaccess file accessing issue to a specific file - apache

Question

=> This is my folder structure
There is a file present name deploy_email.php
This is my .htaccess code
<IfModule mod_rewrite.c>
RewriteEngine on
AddType video/ogg .ogv
AddType video/mp4 .mp4
AddType video/webm .webm
RewriteCond %{THE_REQUEST} ^[A-Z](3,)\s([^.]+)\.php [NC]
RewriteRule ^%1 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*?)/?$ $1.php [NC,L]
RewriteCond %{THE_REQUEST} \s/+(.*?/)?(?:index)?(.*?)\.php[\s?/] [NC]
RewriteRule ^ /%1%2 [R=302,L,NE]
</IfModule>
The problem is i want the deploy_email.php file to be access with extension and rest of the file extensions should be hidden.
If i use the above .htaccess code while inspecting, i found that the data is not get by deploy_mail.php as you can see here => This here
Please provide some solution.

Answer 1

POST data gets lost while doing external redirection using R flag. You should skip all POST requests from redirect rule not just one file.
Replace all of your shown code with this:
RewriteEngine on
AddType video/ogg .ogv
AddType video/mp4 .mp4
AddType video/webm .webm
# redirect only all requests except POST
RewriteCond %{REQUEST_METHOD} !POST
RewriteCond %{THE_REQUEST} \s/+(.*?/)?(?:index)?(.*?)\.(?:php|html?)[\s?/] [NC]
RewriteRule ^ /%1%2 [R=302,L,NE]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.+?)/?$ $1.php [L]
RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule ^(.+?)/?$ $1.html [L]
RewriteCond %{REQUEST_FILENAME}.htm -f
RewriteRule ^(.+?)/?$ $1.htm [L]
Clear your browser cache and retest.