Make Apache return simple message for specific url
Solution 1:
Without any file existing on the server? No. Apache is a great web server, but that's really all it does - serve files (or dynamic content through modules, but the concept is essentially similar). A quick read of the mod_rewrite documentation seems to indicate that something like this:
RewriteRule ^/someurl - [R=204]
should respond to a web request with a "success, no content" HTTP status code. Not exactly what you're after, but might do the trick.
Solution 2:
Rewrite the specific url to i.e. succes.php:
RewriteCond %{REQUEST_URI} ^/your-specific-url
RewriteRule .* /succes.php
And put in succes.php:
<?php
header("text/html");
echo "success";
?>
Solution 3:
Tested with Apache 2.4:
<Location /cajuzinho>
ErrorDocument 200 "mermao"
RewriteEngine On
RewriteRule .* - [R=200]
</Location>
See https://httpd.apache.org/docs/2.4/custom-error.html and http://httpd.apache.org/docs/current/mod/mod_rewrite.html#rewriterule for more info