diff --git a/system/HTTP/CURLRequest.php b/system/HTTP/CURLRequest.php
index 9da231c17716..90157e4e05d4 100644
--- a/system/HTTP/CURLRequest.php
+++ b/system/HTTP/CURLRequest.php
@@ -389,7 +389,7 @@ public function send(string $method, string $url)
             $output = substr($output, strpos($output, $breakString) + 4);
         }
 
-        if (str_starts_with($output, 'HTTP/1.1 200 Connection established')) {
+        if (preg_match('/HTTP\/\d\.\d 200 Connection established/i', $output)) {
             $output = substr($output, strpos($output, $breakString) + 4);
         }
 
diff --git a/tests/system/HTTP/CURLRequestTest.php b/tests/system/HTTP/CURLRequestTest.php
index f14198be2264..df44c427a665 100644
--- a/tests/system/HTTP/CURLRequestTest.php
+++ b/tests/system/HTTP/CURLRequestTest.php
@@ -831,6 +831,21 @@ public function testSendProxied(): void
         $this->assertSame('Hi there', $response->getBody());
     }
 
+    public function testSendProxiedWithHTTP10(): void
+    {
+        $request = $this->getRequest([
+            'base_uri' => 'http://www.foo.com/api/v1/',
+            'delay'    => 100,
+        ]);
+
+        $output = "HTTP/1.0 200 Connection established
+Proxy-Agent: Fortinet-Proxy/1.0\x0d\x0a\x0d\x0aHTTP/1.1 200 OK\x0d\x0a\x0d\x0aHi there";
+        $request->setOutput($output);
+
+        $response = $request->get('answer');
+        $this->assertSame('Hi there', $response->getBody());
+    }
+
     /**
      * See: https://github.com/codeigniter4/CodeIgniter4/issues/7394
      */