apache - mapping non exist file -

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if robots.txt non exist mupping on robots.php, if exist -return robots.txt

rewriteengine on     rewritecond %{robots.txt} !-f [nc]     rewriterule robots.txt robots.php [l]

this code return robots.php

rewritecond %{request_filename} !-f  rewriterule ^/robots\.txt/$ robots.php [l]

think that's need...


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