diff --git a/UPGRADE-7.4.md b/UPGRADE-7.4.md
index 487bf6f5007a6..859fd57d0afa6 100644
--- a/UPGRADE-7.4.md
+++ b/UPGRADE-7.4.md
@@ -22,3 +22,8 @@ HttpClient
----------
* Deprecate using amphp/http-client < 5
+
+HttpFoundation
+--------------
+
+ * Deprecate using `Request::sendHeaders()` after headers have already been sent; use a `StreamedResponse` instead
diff --git a/src/Symfony/Component/HttpFoundation/CHANGELOG.md b/src/Symfony/Component/HttpFoundation/CHANGELOG.md
index 374c31889df3c..ca58a4032d8b8 100644
--- a/src/Symfony/Component/HttpFoundation/CHANGELOG.md
+++ b/src/Symfony/Component/HttpFoundation/CHANGELOG.md
@@ -1,6 +1,11 @@
CHANGELOG
=========
+7.4
+---
+
+ * Deprecate using `Request::sendHeaders()` after headers have already been sent; use a `StreamedResponse` instead
+
7.3
---
diff --git a/src/Symfony/Component/HttpFoundation/Response.php b/src/Symfony/Component/HttpFoundation/Response.php
index 455b026dffb05..173ee3f93eb3b 100644
--- a/src/Symfony/Component/HttpFoundation/Response.php
+++ b/src/Symfony/Component/HttpFoundation/Response.php
@@ -319,7 +319,8 @@ public function sendHeaders(?int $statusCode = null): static
if (headers_sent()) {
if (!\in_array(\PHP_SAPI, ['cli', 'phpdbg', 'embed'], true)) {
$statusCode ??= $this->statusCode;
- header(\sprintf('HTTP/%s %s %s', $this->version, $statusCode, $this->statusText), true, $statusCode);
+ trigger_deprecation('symfony/http-foundation', '7.4', 'Trying to use "%s::sendHeaders()" after headers have already been sent is deprecated will throw a PHP warning in 8.0. Use a "StreamedResponse" instead.', static::class);
+ //header(\sprintf('HTTP/%s %s %s', $this->version, $statusCode, $this->statusText), true, $statusCode);
}
return $this;
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