diff --git a/src/Symfony/Component/HttpClient/MockHttpClient.php b/src/Symfony/Component/HttpClient/MockHttpClient.php
index 1d3d7b8b68..41bb20b299 100644
--- a/src/Symfony/Component/HttpClient/MockHttpClient.php
+++ b/src/Symfony/Component/HttpClient/MockHttpClient.php
@@ -31,16 +31,16 @@ class MockHttpClient implements HttpClientInterface
     private $baseUri;
 
     /**
-     * @param callable|ResponseInterface|ResponseInterface[]|iterable $responseFactory
+     * @param callable|ResponseInterface|ResponseInterface[]|iterable|null $responseFactory
      */
-    public function __construct($responseFactory, string $baseUri = null)
+    public function __construct($responseFactory = null, string $baseUri = null)
     {
         if ($responseFactory instanceof ResponseInterface) {
             $responseFactory = [$responseFactory];
         }
 
-        if (!\is_callable($responseFactory) && !$responseFactory instanceof \Iterator) {
-            $responseFactory = (function () use ($responseFactory) {
+        if (null !== $responseFactory && !\is_callable($responseFactory) && !$responseFactory instanceof \Iterator) {
+            $responseFactory = (static function () use ($responseFactory) {
                 yield from $responseFactory;
             })();
         }
@@ -57,7 +57,9 @@ class MockHttpClient implements HttpClientInterface
         [$url, $options] = $this->prepareRequest($method, $url, $options, ['base_uri' => $this->baseUri], true);
         $url = implode('', $url);
 
-        if (\is_callable($this->responseFactory)) {
+        if (null === $this->responseFactory) {
+            $response = new MockResponse();
+        } elseif (\is_callable($this->responseFactory)) {
             $response = ($this->responseFactory)($method, $url, $options);
         } elseif (!$this->responseFactory->valid()) {
             throw new TransportException('The response factory iterator passed to MockHttpClient is empty.');
diff --git a/src/Symfony/Component/HttpClient/Response/MockResponse.php b/src/Symfony/Component/HttpClient/Response/MockResponse.php
index 9ca47e6624..2eed8b9b88 100644
--- a/src/Symfony/Component/HttpClient/Response/MockResponse.php
+++ b/src/Symfony/Component/HttpClient/Response/MockResponse.php
@@ -111,6 +111,10 @@ class MockResponse implements ResponseInterface
         $response->info['user_data'] = $options['user_data'] ?? null;
         $response->info['url'] = $url;
 
+        if ($mock instanceof self) {
+            $mock->requestOptions = $response->requestOptions;
+        }
+
         self::writeRequest($response, $options, $mock);
         $response->body[] = [$options, $mock];
 
diff --git a/src/Symfony/Component/HttpClient/ScopingHttpClient.php b/src/Symfony/Component/HttpClient/ScopingHttpClient.php
index 5c8a0c411f..5b1da579bc 100644
--- a/src/Symfony/Component/HttpClient/ScopingHttpClient.php
+++ b/src/Symfony/Component/HttpClient/ScopingHttpClient.php
@@ -38,6 +38,17 @@ class ScopingHttpClient implements HttpClientInterface
         $this->defaultRegexp = $defaultRegexp;
     }
 
+    public static function forBaseUri(HttpClientInterface $client, string $baseUri, array $defaultOptions = [], $regexp = null): self
+    {
+        if (null === $regexp) {
+            $regexp = preg_quote(implode('', self::resolveUrl(self::parseUrl('.'), self::parseUrl($baseUri))));
+        }
+
+        $defaultOptions['base_uri'] = $baseUri;
+
+        return new self($client, [$regexp => $defaultOptions], $regexp);
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/src/Symfony/Component/HttpClient/Tests/ScopingHttpClientTest.php b/src/Symfony/Component/HttpClient/Tests/ScopingHttpClientTest.php
index 9ab34c2b1f..7fe9104442 100644
--- a/src/Symfony/Component/HttpClient/Tests/ScopingHttpClientTest.php
+++ b/src/Symfony/Component/HttpClient/Tests/ScopingHttpClientTest.php
@@ -14,14 +14,13 @@ namespace Symfony\Component\HttpClient\Tests;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpClient\Exception\InvalidArgumentException;
 use Symfony\Component\HttpClient\MockHttpClient;
-use Symfony\Component\HttpClient\Response\MockResponse;
 use Symfony\Component\HttpClient\ScopingHttpClient;
 
 class ScopingHttpClientTest extends TestCase
 {
     public function testRelativeUrl()
     {
-        $mockClient = new MockHttpClient([]);
+        $mockClient = new MockHttpClient();
         $client = new ScopingHttpClient($mockClient, []);
 
         $this->expectException(InvalidArgumentException::class);
@@ -30,7 +29,7 @@ class ScopingHttpClientTest extends TestCase
 
     public function testRelativeUrlWithDefaultRegexp()
     {
-        $mockClient = new MockHttpClient(new MockResponse());
+        $mockClient = new MockHttpClient();
         $client = new ScopingHttpClient($mockClient, ['.*' => ['base_uri' => 'http://example.com']], '.*');
 
         $this->assertSame('http://example.com/foo', $client->request('GET', '/foo')->getInfo('url'));
@@ -41,7 +40,7 @@ class ScopingHttpClientTest extends TestCase
      */
     public function testMatchingUrls(string $regexp, string $url, array $options)
     {
-        $mockClient = new MockHttpClient(new MockResponse());
+        $mockClient = new MockHttpClient();
         $client = new ScopingHttpClient($mockClient, $options);
 
         $response = $client->request('GET', $url);
@@ -69,13 +68,7 @@ class ScopingHttpClientTest extends TestCase
             '.*' => ['headers' => ['content-type' => 'text/html']],
         ];
 
-        $mockResponses = [
-            new MockResponse(),
-            new MockResponse(),
-            new MockResponse(),
-        ];
-
-        $mockClient = new MockHttpClient($mockResponses);
+        $mockClient = new MockHttpClient();
         $client = new ScopingHttpClient($mockClient, $defaultOptions);
 
         $response = $client->request('GET', 'http://example.com/foo-bar', ['json' => ['url' => 'http://example.com']]);
@@ -93,4 +86,16 @@ class ScopingHttpClientTest extends TestCase
         $this->assertEquals($requestOptions['headers']['x-app'][0], 'unit-test');
         $this->assertEquals($requestOptions['headers']['content-type'][0], 'text/html');
     }
+
+    public function testForBaseUri()
+    {
+        $client = ScopingHttpClient::forBaseUri(new MockHttpClient(), 'http://example.com/foo');
+
+        $response = $client->request('GET', '/bar');
+        $this->assertSame('http://example.com/foo', implode('', $response->getRequestOptions()['base_uri']));
+        $this->assertSame('http://example.com/bar', $response->getInfo('url'));
+
+        $response = $client->request('GET', 'http://foo.bar/');
+        $this->assertNull($response->getRequestOptions()['base_uri']);
+    }
 }