Ticket #63547: 63547.patch

src/wp-includes/Requests/src/Transport/Curl.php

@@ -418 +418 @@
                                 }
                 }
 
-                // cURL requires a minimum timeout of 1 second when using the system
-                // DNS resolver, as it uses `alarm()`, which is second resolution only.
-                // There's no way to detect which DNS resolver is being used from our
-                // end, so we need to round up regardless of the supplied timeout.
-                //
-                // https://github.com/curl/curl/blob/4f45240bc84a9aa648c8f7243be7b79e9f9323a5/lib/hostip.c#L606-L609
-                $timeout = max($options['timeout'], 1);
+                $using_asynch_dns = false;
+                if (defined('CURL_VERSION_ASYNCHDNS')) {
+                        $curl_version = curl_version();
+                        // phpcs:ignore PHPCompatibility.Constants.NewConstants.curl_version_asynchdnsFound
+                        if (CURL_VERSION_ASYNCHDNS & $curl_version['features']) {
+                                $using_asynch_dns = true;
+                        }
+                }
+
+                if ($using_asynch_dns) {
+                        // It should be safe to use any timeout, even if less than 1 second.
+                        $timeout = $options['timeout'];
+                } else {
+                        // cURL requires a minimum timeout of 1 second when using the system
+                        // DNS resolver, as it uses `alarm()`, which is second resolution only.
+                        // There's no way to detect which DNS resolver is being used from our
+                        // end, so we need to round up regardless of the supplied timeout.
+                        //
+                        // https://github.com/curl/curl/blob/4f45240bc84a9aa648c8f7243be7b79e9f9323a5/lib/hostip.c#L606-L609
+                        $timeout = max($options['timeout'], 1);
+                }
 
                 if (is_int($timeout) || $this->version < self::CURL_7_16_2) {
                         curl_setopt($this->handle, CURLOPT_TIMEOUT, ceil($timeout));