symfony
diff --git a/‎src/Symfony/Component/VarDumper/CHANGELOG.md
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+1 b/‎src/Symfony/Component/VarDumper/CHANGELOG.md
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+1
diff --git a/‎src/Symfony/Component/VarDumper/Tests/Dumper/functions/dump_with_accept_header_all.phpt
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+17 b/‎src/Symfony/Component/VarDumper/Tests/Dumper/functions/dump_with_accept_header_all.phpt
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+17
diff --git a/‎src/Symfony/Component/VarDumper/Tests/Dumper/functions/dump_with_accept_header_html.phpt
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+17 b/‎src/Symfony/Component/VarDumper/Tests/Dumper/functions/dump_with_accept_header_html.phpt
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+17
diff --git a/‎src/Symfony/Component/VarDumper/Tests/Dumper/functions/dump_with_some_accept_header.phpt
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+16 b/‎src/Symfony/Component/VarDumper/Tests/Dumper/functions/dump_with_some_accept_header.phpt
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+16
diff --git a/‎src/Symfony/Component/VarDumper/VarDumper.php
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+13-2 b/‎src/Symfony/Component/VarDumper/VarDumper.php
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+13-2
@@ -6,6 +6,7 @@ CHANGELOG
 
  * Add support for `FORCE_COLOR` environment variable
  * Add support for virtual properties
+ * Add automatic HTML output when `Accept: text/html` is set in the request headers
 
 7.1
 ---
 
@@ -0,0 +1,17 @@
+--TEST--
+Test dump() with Accept header set to "*/*"
+--FILE--
+<?php
+putenv('NO_COLOR=1');
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+$_SERVER['HTTP_ACCEPT'] = 'application/json, */*';
+dump('Test with HTML');
+--EXPECTF--
+%A<pre class=sf-dump id=sf-dump-%d data-indent-pad="  "><span class=sf-dump-label></span> "<span class=sf-dump-str title="14 characters">Test with HTML</span>"
+</pre><script>Sfdump("sf-dump-%d")</script>
@@ -0,0 +1,17 @@
+--TEST--
+Test dump() with Accept header set to "text/html"
+--FILE--
+<?php
+putenv('NO_COLOR=1');
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+$_SERVER['HTTP_ACCEPT'] = 'text/html, text/xml, application/json';
+dump('Test with HTML');
+--EXPECTF--
+%A<pre class=sf-dump id=sf-dump-%d data-indent-pad="  "><span class=sf-dump-label></span> "<span class=sf-dump-str title="14 characters">Test with HTML</span>"
+</pre><script>Sfdump("sf-dump-%d")</script>
@@ -0,0 +1,16 @@
+--TEST--
+Test dump() with Accept header without "text/html" should not output HTML
+--FILE--
+<?php
+putenv('NO_COLOR=1');
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+$_SERVER['HTTP_ACCEPT'] = 'application/json, text/xml';
+dump('Test with JSON');
+--EXPECT--
+"Test with JSON"
@@ -21,6 +21,7 @@
 use Symfony\Component\VarDumper\Dumper\ContextProvider\RequestContextProvider;
 use Symfony\Component\VarDumper\Dumper\ContextProvider\SourceContextProvider;
 use Symfony\Component\VarDumper\Dumper\ContextualizedDumper;
+use Symfony\Component\VarDumper\Dumper\DataDumperInterface;
 use Symfony\Component\VarDumper\Dumper\HtmlDumper;
 use Symfony\Component\VarDumper\Dumper\ServerDumper;
 
@@ -76,11 +77,11 @@ private static function register(): void
             case 'server' === $format:
             case $format && 'tcp' === parse_url($format, \PHP_URL_SCHEME):
                 $host = 'server' === $format ? $_SERVER['VAR_DUMPER_SERVER'] ?? '127.0.0.1:9912' : $format;
-                $dumper = \in_array(\PHP_SAPI, ['cli', 'phpdbg', 'embed'], true) ? new CliDumper() : new HtmlDumper();
+                $dumper = self::guessMostSuitableDumper();
                 $dumper = new ServerDumper($host, $dumper, self::getDefaultContextProviders());
                 break;
             default:
-                $dumper = \in_array(\PHP_SAPI, ['cli', 'phpdbg', 'embed'], true) ? new CliDumper() : new HtmlDumper();
+                $dumper = self::guessMostSuitableDumper();
         }
 
         if (!$dumper instanceof ServerDumper) {
@@ -115,4 +116,14 @@ private static function getDefaultContextProviders(): array
             'source' => new SourceContextProvider(null, null, $fileLinkFormatter),
         ];
     }
+
+    private static function guessMostSuitableDumper(): DataDumperInterface
+    {
+        $accepted = array_map('trim', explode(',', $_SERVER['HTTP_ACCEPT'] ?? ''));
+        if (array_intersect($accepted, ['text/html', '*/*'])) {
+            return new HtmlDumper();
+        }
+
+        return new CliDumper();
+    }
 }