diff --git a/src/Symfony/Component/HttpClient/Response/CurlResponse.php b/src/Symfony/Component/HttpClient/Response/CurlResponse.php
index 341617f701f5c..cbd70e9e07ce4 100644
--- a/src/Symfony/Component/HttpClient/Response/CurlResponse.php
+++ b/src/Symfony/Component/HttpClient/Response/CurlResponse.php
@@ -340,15 +340,8 @@ private static function parseHeaderLine($ch, string $data, array &$info, array &
         }
 
         if ('' !== $data) {
-            try {
-                // Regular header line: add it to the list
-                self::addResponseHeaders([$data], $info, $headers);
-            } catch (TransportException $e) {
-                $multi->handlesActivity[$id][] = null;
-                $multi->handlesActivity[$id][] = $e;
-
-                return \strlen($data);
-            }
+            // Regular header line: add it to the list
+            self::addResponseHeaders([$data], $info, $headers);
 
             if (!str_starts_with($data, 'HTTP/')) {
                 if (0 === stripos($data, 'Location:')) {
diff --git a/src/Symfony/Component/HttpClient/Response/ResponseTrait.php b/src/Symfony/Component/HttpClient/Response/ResponseTrait.php
index b70c1e885a869..2efa82b477683 100644
--- a/src/Symfony/Component/HttpClient/Response/ResponseTrait.php
+++ b/src/Symfony/Component/HttpClient/Response/ResponseTrait.php
@@ -260,7 +260,7 @@ private static function initialize(self $response): void
     private static function addResponseHeaders(array $responseHeaders, array &$info, array &$headers, string &$debug = ''): void
     {
         foreach ($responseHeaders as $h) {
-            if (11 <= \strlen($h) && '/' === $h[4] && preg_match('#^HTTP/\d+(?:\.\d+)? ([1-9]\d\d)(?: |$)#', $h, $m)) {
+            if (11 <= \strlen($h) && '/' === $h[4] && preg_match('#^HTTP/\d+(?:\.\d+)? (\d\d\d)(?: |$)#', $h, $m)) {
                 if ($headers) {
                     $debug .= "< \r\n";
                     $headers = [];
@@ -275,10 +275,6 @@ private static function addResponseHeaders(array $responseHeaders, array &$info,
         }
 
         $debug .= "< \r\n";
-
-        if (!$info['http_code']) {
-            throw new TransportException(sprintf('Invalid or missing HTTP status line for "%s".', implode('', $info['url'])));
-        }
     }
 
     private function checkStatusCode()
diff --git a/src/Symfony/Component/HttpClient/Tests/MockHttpClientTest.php b/src/Symfony/Component/HttpClient/Tests/MockHttpClientTest.php
index d56f20aec206d..714e35eaf21de 100644
--- a/src/Symfony/Component/HttpClient/Tests/MockHttpClientTest.php
+++ b/src/Symfony/Component/HttpClient/Tests/MockHttpClientTest.php
@@ -66,6 +66,13 @@ public function invalidResponseFactoryProvider()
         ];
     }
 
+    public function testZeroStatusCode()
+    {
+        $client = new MockHttpClient(new MockResponse('', ['response_headers' => ['HTTP/1.1 000 ']]));
+        $response = $client->request('GET', 'https://foo.bar');
+        $this->assertSame(0, $response->getStatusCode());
+    }
+
     public function testThrowExceptionInBodyGenerator()
     {
         $mockHttpClient = new MockHttpClient([