[HttpClient] fix race condition when reading response with informational status

src/Symfony/Component/HttpClient/CurlHttpClient.php

@@ -355,7 +355,7 @@ final class CurlHttpClient implements HttpClientInterface, LoggerAwareInterface
      */
     private static function acceptPushForRequest(string $method, array $options, PushedResponse $pushedResponse): bool
     {
-        if ($options['body'] || $method !== $pushedResponse->requestHeaders[':method'][0]) {
+        if ('' !== $options['body'] || $method !== $pushedResponse->requestHeaders[':method'][0]) {
             return false;
         }
 

src/Symfony/Component/HttpClient/Response/CurlResponse.php

@@ -121,15 +121,17 @@ final class CurlResponse implements ResponseInterface
 
             if (\in_array($waitFor, ['headers', 'destruct'], true)) {
                 try {
-                    self::stream([$response])->current();
+                    foreach (self::stream([$response]) as $chunk) {
+                        if ($chunk->isFirst()) {
+                            break;
+                        }
+                    }
                 } catch (\Throwable $e) {
                     // Persist timeouts thrown during initialization
                     $response->info['error'] = $e->getMessage();
                     $response->close();
                     throw $e;
                 }
-            } elseif ('content' === $waitFor && ($response->multi->handlesActivity[$response->id][0] ?? null) instanceof FirstChunk) {
-                self::stream([$response])->current();
             }
 
             curl_setopt($ch, CURLOPT_HEADERFUNCTION, null);

src/Symfony/Component/HttpClient/Response/NativeResponse.php

@@ -65,7 +65,11 @@ final class NativeResponse implements ResponseInterface
             }
 
             if (null === $response->remaining) {
-                self::stream([$response])->current();
+                foreach (self::stream([$response]) as $chunk) {
+                    if ($chunk->isFirst()) {
+                        break;
+                    }
+                }
             }
         };
     }

src/Symfony/Contracts/HttpClient/Test/Fixtures/web/index.php

@@ -45,6 +45,8 @@ switch ($vars['REQUEST_URI']) {
         header('HTTP/1.1 103 Early Hints');
         header('Link: </style.css>; rel=preload; as=style', false);
         header('Link: </script.js>; rel=preload; as=script', false);
+        flush();
+        usleep(1000);
         echo "HTTP/1.1 200 OK\r\n";
         echo "Date: Fri, 26 May 2017 10:02:11 GMT\r\n";
         echo "Content-Length: 13\r\n";