diff --git a/output/swoole/constants.php b/output/swoole/constants.php
index 17160b0c..6470a27a 100644
--- a/output/swoole/constants.php
+++ b/output/swoole/constants.php
@@ -1,11 +1,11 @@
 <?php
 
-define('SWOOLE_VERSION', '4.5.3-beta');
+define('SWOOLE_VERSION', '4.5.3RC1');
 define('SWOOLE_VERSION_ID', 40503);
 define('SWOOLE_MAJOR_VERSION', 4);
 define('SWOOLE_MINOR_VERSION', 5);
 define('SWOOLE_RELEASE_VERSION', 3);
-define('SWOOLE_EXTRA_VERSION', 'beta');
+define('SWOOLE_EXTRA_VERSION', 'RC1');
 define('SWOOLE_DEBUG', '');
 define('SWOOLE_HAVE_COMPRESSION', '1');
 define('SWOOLE_HAVE_ZLIB', '1');
diff --git a/output/swoole/namespace/Coroutine/MySQL.php b/output/swoole/namespace/Coroutine/MySQL.php
index 9a44a94e..160c3864 100644
--- a/output/swoole/namespace/Coroutine/MySQL.php
+++ b/output/swoole/namespace/Coroutine/MySQL.php
@@ -118,7 +118,7 @@ public function rollback($timeout = null)
     /**
      * @return mixed
      */
-    public function escape($String, $flags = null)
+    public function escape($string, $flags = null)
     {
     }
 
diff --git a/output/swoole_library/src/core/ArrayObject.php b/output/swoole_library/src/core/ArrayObject.php
index e4cd389b..9eba271b 100644
--- a/output/swoole_library/src/core/ArrayObject.php
+++ b/output/swoole_library/src/core/ArrayObject.php
@@ -16,6 +16,7 @@
 use Iterator;
 use RuntimeException;
 use Serializable;
+use Swoole\Exception\ArrayKeyNotExists;
 
 class ArrayObject implements ArrayAccess, Serializable, Countable, Iterator
 {
@@ -95,6 +96,9 @@ public function next()
      */
     public function get($key)
     {
+        if (!$this->exists($key)) {
+            throw new ArrayKeyNotExists($key);
+        }
         return static::detectType($this->array[$key]);
     }
 
@@ -314,6 +318,12 @@ public function pushFront($value)
         return array_unshift($this->array, $value);
     }
 
+    public function append(...$values): ArrayObject
+    {
+        array_push($this->array, ...$values);
+        return $this;
+    }
+
     /**
      * @param mixed $value
      * @return int
diff --git a/output/swoole_library/src/core/Constant.php b/output/swoole_library/src/core/Constant.php
index fc35c82f..252667d5 100644
--- a/output/swoole_library/src/core/Constant.php
+++ b/output/swoole_library/src/core/Constant.php
@@ -72,16 +72,28 @@ class Constant
 
     public const OPTION_DNS_SERVER = 'dns_server';
 
+    public const OPTION_SOCKET_DNS_TIMEOUT = 'socket_dns_timeout';
+
+    public const OPTION_SOCKET_CONNECT_TIMEOUT = 'socket_connect_timeout';
+
+    public const OPTION_SOCKET_WRITE_TIMEOUT = 'socket_write_timeout';
+
     public const OPTION_SOCKET_SEND_TIMEOUT = 'socket_send_timeout';
 
+    public const OPTION_SOCKET_READ_TIMEOUT = 'socket_read_timeout';
+
+    public const OPTION_SOCKET_RECV_TIMEOUT = 'socket_recv_timeout';
+
+    public const OPTION_SOCKET_BUFFER_SIZE = 'socket_buffer_size';
+
+    public const OPTION_SOCKET_TIMEOUT = 'socket_timeout';
+
     public const OPTION_ENABLE_SIGNALFD = 'enable_signalfd';
 
     public const OPTION_WAIT_SIGNAL = 'wait_signal';
 
     public const OPTION_DNS_CACHE_REFRESH_TIME = 'dns_cache_refresh_time';
 
-    public const OPTION_SOCKET_BUFFER_SIZE = 'socket_buffer_size';
-
     public const OPTION_THREAD_NUM = 'thread_num';
 
     public const OPTION_MIN_THREAD_NUM = 'min_thread_num';
@@ -188,16 +200,6 @@ class Constant
 
     public const OPTION_STACK_SIZE = 'stack_size';
 
-    public const OPTION_SOCKET_DNS_TIMEOUT = 'socket_dns_timeout';
-
-    public const OPTION_SOCKET_CONNECT_TIMEOUT = 'socket_connect_timeout';
-
-    public const OPTION_SOCKET_TIMEOUT = 'socket_timeout';
-
-    public const OPTION_SOCKET_READ_TIMEOUT = 'socket_read_timeout';
-
-    public const OPTION_SOCKET_WRITE_TIMEOUT = 'socket_write_timeout';
-
     public const OPTION_DNS_CACHE_EXPIRE = 'dns_cache_expire';
 
     public const OPTION_DNS_CACHE_CAPACITY = 'dns_cache_capacity';
@@ -214,6 +216,8 @@ class Constant
 
     public const OPTION_DEFER = 'defer';
 
+    public const OPTION_LOWERCASE_HEADER = 'lowercase_header';
+
     public const OPTION_KEEP_ALIVE = 'keep_alive';
 
     public const OPTION_WEBSOCKET_MASK = 'websocket_mask';
@@ -372,6 +376,8 @@ class Constant
 
     public const OPTION_TCP_KEEPCOUNT = 'tcp_keepcount';
 
+    public const OPTION_TCP_USER_TIMEOUT = 'tcp_user_timeout';
+
     public const OPTION_TCP_FASTOPEN = 'tcp_fastopen';
 
     public const OPTION_PACKAGE_BODY_START = 'package_body_start';
diff --git a/output/swoole_library/src/core/Coroutine/Barrier.php b/output/swoole_library/src/core/Coroutine/Barrier.php
new file mode 100644
index 00000000..2e8f099e
--- /dev/null
+++ b/output/swoole_library/src/core/Coroutine/Barrier.php
@@ -0,0 +1,64 @@
+<?php
+/**
+ * This file is part of Swoole.
+ *
+ * @link     https://www.swoole.com
+ * @contact  team@swoole.com
+ * @license  https://github.com/swoole/library/blob/master/LICENSE
+ */
+
+declare(strict_types=1);
+
+namespace Swoole\Coroutine;
+
+use Swoole\Coroutine;
+use Swoole\Exception;
+use Swoole\Timer;
+
+class Barrier
+{
+    private $cid = -1;
+
+    private $timer = -1;
+
+    private static $cancel_list = [];
+
+    public function __destruct()
+    {
+        if ($this->timer != -1) {
+            Timer::clear($this->timer);
+            if (static::$cancel_list[$this->cid]) {
+                unset(static::$cancel_list[$this->cid]);
+                return;
+            }
+        }
+        if ($this->cid != -1) {
+            Coroutine::resume($this->cid);
+        }
+    }
+
+    public static function make()
+    {
+        return new static();
+    }
+
+    /**
+     * @throws Exception
+     */
+    public static function wait(Barrier &$barrier, float $timeout = -1)
+    {
+        if ($barrier->cid != -1) {
+            throw new Exception('The barrier is waiting, cannot wait again.');
+        }
+        $cid = Coroutine::getCid();
+        $barrier->cid = $cid;
+        if ($timeout > 0 && ($timeout_ms = intval($timeout * 1000)) > 0) {
+            $barrier->timer = Timer::after($timeout_ms, function () use ($cid) {
+                self::$cancel_list[$cid] = true;
+                Coroutine::resume($cid);
+            });
+        }
+        $barrier = null;
+        Coroutine::yield();
+    }
+}
diff --git a/output/swoole_library/src/core/Coroutine/WaitGroup.php b/output/swoole_library/src/core/Coroutine/WaitGroup.php
index dc2bfe10..f2b6a02c 100644
--- a/output/swoole_library/src/core/Coroutine/WaitGroup.php
+++ b/output/swoole_library/src/core/Coroutine/WaitGroup.php
@@ -22,9 +22,12 @@ class WaitGroup
 
     protected $waiting = false;
 
-    public function __construct()
+    public function __construct(int $delta = 0)
     {
         $this->chan = new Channel(1);
+        if ($delta > 0) {
+            $this->add($delta);
+        }
     }
 
     public function add(int $delta = 1): void
diff --git a/output/swoole_library/src/core/Coroutine/functions.php b/output/swoole_library/src/core/Coroutine/functions.php
index 40dcae38..a9a0cc37 100644
--- a/output/swoole_library/src/core/Coroutine/functions.php
+++ b/output/swoole_library/src/core/Coroutine/functions.php
@@ -27,3 +27,17 @@ function batch(array $tasks, float $timeout = -1): array
     $wg->wait($timeout);
     return $tasks;
 }
+
+function parallel(int $n, callable $fn): void
+{
+    $count = $n;
+    $wg = new WaitGroup();
+    $wg->add($n);
+    while ($count--) {
+        Coroutine::create(function () use ($fn, $wg) {
+            $fn();
+            $wg->done();
+        });
+    }
+    $wg->wait();
+}
diff --git a/output/swoole_library/src/core/Curl/Handler.php b/output/swoole_library/src/core/Curl/Handler.php
index ecd40b35..eff8406e 100644
--- a/output/swoole_library/src/core/Curl/Handler.php
+++ b/output/swoole_library/src/core/Curl/Handler.php
@@ -496,10 +496,15 @@ private function setOption(int $opt, $value): bool
                 $this->method = (string) $value;
                 break;
             case CURLOPT_PROTOCOLS:
-                if ($value > 3) {
+                if (($value & ~(CURLPROTO_HTTP | CURLPROTO_HTTPS)) != 0) {
                     throw new CurlException("swoole_curl_setopt(): CURLOPT_PROTOCOLS[{$value}] is not supported");
                 }
                 break;
+            case CURLOPT_REDIR_PROTOCOLS:
+                if (($value & ~(CURLPROTO_HTTP | CURLPROTO_HTTPS)) != 0) {
+                    throw new CurlException("swoole_curl_setopt(): CURLOPT_REDIR_PROTOCOLS[{$value}] is not supported");
+                }
+                break;
             case CURLOPT_HTTP_VERSION:
                 if ($value != CURL_HTTP_VERSION_1_1) {
                     trigger_error("swoole_curl_setopt(): CURLOPT_HTTP_VERSION[{$value}] is not supported", E_USER_WARNING);
@@ -710,6 +715,8 @@ private function execute()
                 $errCode = $client->errCode;
                 if ($errCode == SWOOLE_ERROR_DNSLOOKUP_RESOLVE_FAILED or $errCode == SWOOLE_ERROR_DNSLOOKUP_RESOLVE_TIMEOUT) {
                     $this->setError(CURLE_COULDNT_RESOLVE_HOST, 'Could not resolve host: ' . $client->host);
+                } else {
+                    $this->setError($errCode, $client->errMsg);
                 }
                 $this->info['total_time'] = microtime(true) - $timeBegin;
                 return false;
diff --git a/output/swoole_library/src/core/Database/MysqliPool.php b/output/swoole_library/src/core/Database/MysqliPool.php
index 70d3bde2..c63b34e9 100644
--- a/output/swoole_library/src/core/Database/MysqliPool.php
+++ b/output/swoole_library/src/core/Database/MysqliPool.php
@@ -40,7 +40,7 @@ public function __construct(MysqliConfig $config, int $size = self::DEFAULT_SIZE
                 $this->config->getUnixSocket()
             );
             if ($mysqli->connect_errno) {
-                throw new MysqliException($mysqli->connect_errno, $mysqli->connect_errno);
+                throw new MysqliException($mysqli->connect_error, $mysqli->connect_errno);
             }
             return $mysqli;
         }, $size, MysqliProxy::class);
diff --git a/output/swoole_library/src/core/Exception/ArrayKeyNotExists.php b/output/swoole_library/src/core/Exception/ArrayKeyNotExists.php
new file mode 100644
index 00000000..95b2a588
--- /dev/null
+++ b/output/swoole_library/src/core/Exception/ArrayKeyNotExists.php
@@ -0,0 +1,16 @@
+<?php
+/**
+ * This file is part of Swoole.
+ *
+ * @link     https://www.swoole.com
+ * @contact  team@swoole.com
+ * @license  https://github.com/swoole/library/blob/master/LICENSE
+ */
+
+declare(strict_types=1);
+
+namespace Swoole\Exception;
+
+class ArrayKeyNotExists extends \RuntimeException
+{
+}
diff --git a/output/swoole_library/src/core/StringObject.php b/output/swoole_library/src/core/StringObject.php
index d555c406..11f31174 100644
--- a/output/swoole_library/src/core/StringObject.php
+++ b/output/swoole_library/src/core/StringObject.php
@@ -156,14 +156,25 @@ public function startsWith(string $needle): bool
         return strpos($this->string, $needle) === 0;
     }
 
-    public function contains(string $subString): bool
+    public function endsWith(string $needle): bool
     {
-        return strpos($this->string, $subString) !== false;
+        return strrpos($this->string, $needle) === (strlen($this->string) - strlen($needle));
     }
 
-    public function endsWith(string $needle): bool
+    public function equals($str, bool $strict = false): bool
     {
-        return strrpos($this->string, $needle) === (strlen($this->string) - strlen($needle));
+        if ($str instanceof StringObject) {
+            $str = strval($str);
+        }
+        if ($strict) {
+            return $this->string === $str;
+        }
+        return $this->string == $str;
+    }
+
+    public function contains(string $subString): bool
+    {
+        return strpos($this->string, $subString) !== false;
     }
 
     public function split(string $delimiter, int $limit = PHP_INT_MAX): ArrayObject