php - Sending HTTP request through cron job

I have a PHP file that is deployed in a server:

/var/www/html/cron/leave_mail.php
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The code inside this PHP file is just sending a request via CURL (The server of the url is the same server of the cron job):

<?php

$url = "http://my-site.build.com/sendmail/sendmail_leave";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, TRUE);
curl_setopt($ch, CURLOPT_NOBODY, TRUE); // remove body
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$head = curl_exec($ch);

curl_close($ch);

?>
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Now I created a cron job on the same server where I deployed the PHP file:

* * * * * php /var/www/html/cron/leave_mail.php
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After 1 minute, it didn't execute the command inside the PHP file, however, I can see on the system logs that the cron job runs.

I run my local virtual machine with ubuntu os and created the same cron job, executing the same file. After 1 min, I can see that it executes the command inside the PHP file because the data on the database was updated.

I'm really puzzled on why the cron job on the server didn't executes the PHP command. I'm stuck on this issue.

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