Curl Bad Request

We are getting error while using adding curl request in loop as shown in below code.
eventhough first entry from the loop gets consumed properly , from 2nd loop onwards we get error..

#$data is large XML file, which we divide in chunks and pass in for loop where curl request is added.

$posting1 = "xmldata=" . rawurlencode($data);
$Medi_URL2 = "https://proda.mediemr.net:4443/pls/htmldb/MEDIDATA.GET_SURESCRIPT_DATA_NEW";
$i = 0;
$len = 32000;
$arr2 = array();

while($i < strlen($posting1)) {
    $arr2[] = substr($posting1, $i, $len);
    $i += $len;
}


for($cnt=0;$cnt<count($arr2);$cnt++)
{
      $value=      $arr2[$cnt];
        $ch = curl_init();
      
      curl_setopt($ch, CURLOPT_URL,$Medi_URL2);
     curl_setopt($ch, CURLOPT_POST, 1);
     curl_setopt($ch, CURLOPT_POSTFIELDS,$value);
   

 ### Return post result string, no just success code
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);


  $result = curl_exec ($ch);
  curl_close ($ch);
   unset($ch);
  unset($value);
}
BadRequestError.jpg