libcurl(?) bug

hi All,


I might found a bug, but I'm unsure and I'm unsure if it's libcurl or a 
php issue.


There is this code (got from a dev, I am a sysadmin):

<?php
   ini_set('display_errors', 1);
   error_reporting(E_ALL);

   $ch = curl_init();
   $url = 'https://google.com';
   curl_setopt($ch, CURLOPT_URL, $url);
   curl_setopt($ch, CURLOPT_HEADER, false);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
   curl_setopt($ch, CURLOPT_DNS_CACHE_TIMEOUT, 0);
   curl_setopt($ch, CURLOPT_TIMEOUT, 30);
   curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
   curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
   // ORIGINAL:
   //curl_setopt($ch, CURLOPT_HTTPHEADER, array("Accept: xml/, text/, 
/\r\n"));

   // OK:
   //curl_setopt($ch, CURLOPT_HTTPHEADER, array("Accept: /\r"));

   // NOK:
   curl_setopt($ch, CURLOPT_HTTPHEADER, array("Accept: /\r\n"));

   $response = curl_exec($ch);
   if(curl_exec($ch) === false) $response .= curl_error($ch);
   curl_close($ch);

   print_r($response);
?>

There is an extra HTTP header is like this and it works:

   curl_setopt($ch, CURLOPT_HTTPHEADER, array("Accept: /\r"));


It does not work if it looks like this:

   curl_setopt($ch, CURLOPT_HTTPHEADER, array("Accept: /\r*\n*"));


Or it works if the $url is not *https*, but http.


The original code worked on Debian 9 and Ubuntu 18.04 and does not work 
on Debian 10 and Ubuntu 20.04 and no matters if PHP comes from Sury's 
PPA or from the original distribution.

That's why libcurl is suspicious to me.


Do you have any thoughts on this?


10x

tamas