Comment 4 for bug 1887826

I'm not quite sure what to say about how to reproduce.
POST a file using PHP-cURL to a server that doesn't support chunked mode.

I'm using https://sandbox.zenodo.com, but this requires a free account and utilizing their API, which seems beyond the scope of what I should put in a comment. Here is a sample similar to what I'm doing, with url/token/file removed:
-----------------
<?php
$url = '';
$access_token = '';
$file = '';
$ch = curl_init($url);
$options = [
   CURLOPT_CUSTOMREQUEST => 'POST,
   CURLOPT_RETURNTRANSFER => true,
   CURLOPT_HTTPHEADER => [
      'Authorization: Bearer ' . $access_token,
      'Content-Type: multipart/form-data',
   ],
   CURLOPT_SSL_VERIFYHOST => 2,
   CURLOPT_FOLLOWLOCATION => true,
   CURLOPT_POSTREDIR => 3,
   CURLINFO_HEADER_OUT => true,
   CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,//this has no effect
];
$file = curl_file_create(realpath($file), null, basename($file));
$data = ['file' => $file, 'name' => basename($file)];
$options[CURLOPT_POSTFIELDS] = $data;
curl_setopt_array($ch, $options);
$response = curl_exec($ch);
$curl_info = curl_getinfo($ch);
$curl_error = curl_error($ch);
curl_close($ch);

This works in Ubuntu 18, but not Ubuntu 20. To make it work in 20 I have to additionally empty the Transfer-Enconding header and determine and set the Content-Length header. This should not be necessary:
$options[CURLOPT_HTTPHEADER][] = "Transfer-Encoding: ";
//not sure how to determine $size
$options[CURLOPT_HTTPHEADER][] = "Content-Length: $size"