feature symfony#52047 [HttpFoundation][Runtime] Add $flush parameter to Response::send() (fancyweb)

This PR was merged into the 6.4 branch.

Discussion
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[HttpFoundation][Runtime] Add $flush parameter to Response::send()

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | -
| License       | MIT

Inspired by symfony#51912 and symfony#45205 subjects

Adds optional argument `$flush` to `Response::send()`. If `$flush === false`, output buffers are not flushed/`*_finish_request()` and alike functions are not called.

We leverage that in the Runtime component by not flushing the output buffers when debug mode is on in order to see exceptions thrown in listeners listening on the `TerminateEvent` and also to feel a more "real" processing time of things happening on terminate.

Commits
-------

a3304cc [HttpFoundation] Add $flush parameter to Response::send()

Author: nicolas-grekas

src/Symfony/Component/HttpFoundation/CHANGELOG.md

@@ -8,6 +8,7 @@ CHANGELOG
  * Support root-level `Generator` in `StreamedJsonResponse`
  * Add `UriSigner` from the HttpKernel component
  * Add `partitioned` flag to `Cookie` (CHIPS Cookie)
+ * Add argument `bool $flush = true` to `Response::send()`
 
 6.3
 ---

src/Symfony/Component/HttpFoundation/Response.php

@@ -415,13 +415,20 @@ public function sendContent(): static
     /**
      * Sends HTTP headers and content.
      *
+     * @param bool $flush Whether output buffers should be flushed
+     *
      * @return $this
      */
-    public function send(): static
+    public function send(/* bool $flush = true */): static
     {
         $this->sendHeaders();
         $this->sendContent();
 
+        $flush = 1 <= \func_num_args() ? func_get_arg(0) : true;
+        if (!$flush) {
+            return $this;
+        }
+
         if (\function_exists('fastcgi_finish_request')) {
             fastcgi_finish_request();
         } elseif (\function_exists('litespeed_finish_request')) {

src/Symfony/Component/Runtime/CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+6.4
+---
+
+ * Add argument `bool $debug = false` to `HttpKernelRunner::__construct()`
+
 5.4
 ---
 

src/Symfony/Component/Runtime/Runner/Symfony/HttpKernelRunner.php

@@ -24,13 +24,14 @@ class HttpKernelRunner implements RunnerInterface
     public function __construct(
         private readonly HttpKernelInterface $kernel,
         private readonly Request $request,
+        private readonly bool $debug = false,
     ) {
     }
 
     public function run(): int
     {
         $response = $this->kernel->handle($this->request);
-        $response->send();
+        $response->send(!$this->debug);
 
         if ($this->kernel instanceof TerminableInterface) {
             $this->kernel->terminate($this->request, $response);

src/Symfony/Component/Runtime/SymfonyRuntime.php

@@ -131,7 +131,7 @@ public function __construct(array $options = [])
     public function getRunner(?object $application): RunnerInterface
     {
         if ($application instanceof HttpKernelInterface) {
-            return new HttpKernelRunner($application, Request::createFromGlobals());
+            return new HttpKernelRunner($application, Request::createFromGlobals(), $this->options['debug'] ?? false);
         }
 
         if ($application instanceof Response) {