feat: CURL option force_ip_resolve

system/HTTP/CURLRequest.php

@@ -649,6 +649,15 @@ protected function setCURLOptions(array $curlOptions = [], array $config = [])
             $this->setHeader('Content-Length', (string) strlen($json));
         }
 
+        // Resolve IP
+        if (array_key_exists('force_ip_resolve', $config)) {
+            $curlOptions[CURLOPT_IPRESOLVE] = match ($config['force_ip_resolve']) {
+                'v4'    => CURL_IPRESOLVE_V4,
+                'v6'    => CURL_IPRESOLVE_V6,
+                default => CURL_IPRESOLVE_WHATEVER
+            };
+        }
+
         // version
         if (! empty($config['version'])) {
             $version = sprintf('%.1F', $config['version']);

tests/system/HTTP/CURLRequestTest.php

@@ -1187,6 +1187,42 @@ public function testHTTPv3(): void
         $this->assertSame(CURL_HTTP_VERSION_3, $options[CURLOPT_HTTP_VERSION]);
     }
 
+    public function testForceResolveIPv4(): void
+    {
+        $this->request->request('POST', '/post', [
+            'force_ip_resolve' => 'v4',
+        ]);
+
+        $options = $this->request->curl_options;
+
+        $this->assertArrayHasKey(CURLOPT_IPRESOLVE, $options);
+        $this->assertSame(CURL_IPRESOLVE_V4, $options[CURLOPT_IPRESOLVE]);
+    }
+
+    public function testForceResolveIPv6(): void
+    {
+        $this->request->request('POST', '/post', [
+            'force_ip_resolve' => 'v6',
+        ]);
+
+        $options = $this->request->curl_options;
+
+        $this->assertArrayHasKey(CURLOPT_IPRESOLVE, $options);
+        $this->assertSame(CURL_IPRESOLVE_V6, $options[CURLOPT_IPRESOLVE]);
+    }
+
+    public function testForceResolveIPUnknown(): void
+    {
+        $this->request->request('POST', '/post', [
+            'force_ip_resolve' => 'v?',
+        ]);
+
+        $options = $this->request->curl_options;
+
+        $this->assertArrayHasKey(CURLOPT_IPRESOLVE, $options);
+        $this->assertSame(\CURL_IPRESOLVE_WHATEVER, $options[CURLOPT_IPRESOLVE]);
+    }
+
     public function testCookieOption(): void
     {
         $holder = SUPPORTPATH . 'HTTP/Files/CookiesHolder.txt';

user_guide_src/source/libraries/curlrequest.rst

@@ -364,6 +364,15 @@ is true:
 
 .. _curlrequest-version:
 
+force_ip_resolve
+================
+
+.. versionadded:: 4.6.0
+
+To set the HTTP handlers to use ``v4`` only ipv4 protocol or ``v6`` for ipv6 protocol:
+
+.. literalinclude:: curlrequest/036.php
+
 version
 =======
 

user_guide_src/source/libraries/curlrequest/036.php

@@ -0,0 +1,4 @@
+<?php
+
+// Force ipv4 resolve
+$client->request('GET', '/', ['force_ip_resolve' => 'v4']); // v4 or v6