diff --git a/src/Illuminate/Http/Client/PendingRequest.php b/src/Illuminate/Http/Client/PendingRequest.php
index 8db4e46d05d5..b93e2933a127 100644
--- a/src/Illuminate/Http/Client/PendingRequest.php
+++ b/src/Illuminate/Http/Client/PendingRequest.php
@@ -886,10 +886,6 @@ public function pool(callable $callback)
      */
     public function send(string $method, string $url, array $options = [])
     {
-        if (! Str::startsWith($url, ['http://', 'https://'])) {
-            $url = ltrim(rtrim($this->baseUrl, '/').'/'.ltrim($url, '/'), '/');
-        }
-
         $url = $this->expandUrlParameters($url);
 
         $options = $this->parseHttpOptions($options);
@@ -966,6 +962,10 @@ protected function expandUrlParameters(string $url)
      */
     protected function parseHttpOptions(array $options)
     {
+        if ($this->baseUrl && ! isset($options['base_uri'])) {
+            $options['base_uri'] = $this->baseUrl;
+        }
+
         if (isset($options[$this->bodyFormat])) {
             if ($this->bodyFormat === 'multipart') {
                 $options[$this->bodyFormat] = $this->parseMultipartBodyFormat($options[$this->bodyFormat]);
diff --git a/tests/Http/HttpClientTest.php b/tests/Http/HttpClientTest.php
index 75fd630a418f..b690f024bff8 100644
--- a/tests/Http/HttpClientTest.php
+++ b/tests/Http/HttpClientTest.php
@@ -985,23 +985,62 @@ public function testGetWithArrayQueryParamEncodes()
         });
     }
 
-    public function testWithBaseUrl()
+    /**
+     * @dataProvider baseUriWithRefProvider
+     */
+    public function testWithBaseUrl(string $baseUri, string $ref, string $expectedResolvedUri)
     {
         $this->factory->fake();
 
-        $this->factory->baseUrl('http://foo.com/')->get('get');
+        $this->factory->baseUrl($baseUri)->get($ref);
 
-        $this->factory->assertSent(function (Request $request) {
-            return $request->url() === 'http://foo.com/get';
+        $this->factory->assertSent(function (Request $request) use ($expectedResolvedUri) {
+            return $request->url() === $expectedResolvedUri;
         });
+    }
 
-        $this->factory->fake();
-
-        $this->factory->baseUrl('http://foo.com/')->get('http://bar.com/get');
-
-        $this->factory->assertSent(function (Request $request) {
-            return $request->url() === 'http://bar.com/get';
-        });
+    /**
+     * @return array
+     */
+    public static function baseUriWithRefProvider()
+    {
+        return [
+            [
+                '',
+                'bar',
+                'bar'
+            ],
+            [
+                'http://foo.com',
+                '/bar',
+                'http://foo.com/bar'
+            ],
+            [
+                'http://foo.com/foo',
+                '/bar',
+                'http://foo.com/bar'
+            ],
+            [
+                'http://foo.com/foo',
+                'bar',
+                'http://foo.com/bar'
+            ],
+            [
+                'http://foo.com/foo/',
+                'bar',
+                'http://foo.com/foo/bar'
+            ],
+            [
+                'http://foo.com',
+                'http://baz.com',
+                'http://baz.com'
+            ],
+            [
+                'http://foo.com/?bar',
+                'bar',
+                'http://foo.com/bar'
+            ],
+        ];
     }
 
     public function testCanConfirmManyHeaders()