bug symfony#54517 [HttpClient] Let curl handle transfer encoding (michaelhue)

This PR was squashed before being merged into the 5.4 branch.

Discussion
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[HttpClient] Let curl handle transfer encoding

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix symfony#54516, Fix symfony#54491
| License       | MIT

Removes the `Transfer-Encoding: chunked` header that is added for chunked request bodies. This will allow curl to handle the transfer encoding and set appropriate headers based on the HTTP protocol version it negotiated with the server, since HTTP/2 does not support chunked transfer encoding.

Commits
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69a7867 [HttpClient] Let curl handle transfer encoding

Author: nicolas-grekas

src/Symfony/Component/HttpClient/CurlHttpClient.php

@@ -246,9 +246,8 @@ public function request(string $method, string $url, array $options = []): Respo
 
             if (isset($options['normalized_headers']['content-length'][0])) {
                 $curlopts[\CURLOPT_INFILESIZE] = (int) substr($options['normalized_headers']['content-length'][0], \strlen('Content-Length: '));
-            }
-            if (!isset($options['normalized_headers']['transfer-encoding'])) {
-                $curlopts[\CURLOPT_HTTPHEADER][] = 'Transfer-Encoding:'.(isset($curlopts[\CURLOPT_INFILESIZE]) ? '' : ' chunked');
+            } elseif (!isset($options['normalized_headers']['transfer-encoding'])) {
+                $curlopts[\CURLOPT_INFILESIZE] = -1;
             }
 
             if ('POST' !== $method) {