協程中進行TCP異步調用，response read error

服務端: Swoole Hprose 客戶端: PHP Hprose

在客戶端創了個協程，協程中使用yield等待返回異步方法結果。請問為什麼結果會是response read error？但是，把服務端及客戶端由tcp改為http，就能正常操作。

\Hprose\Future\co(function() {
    $rpc = new \Hprose\Socket\Client("tcp://localhost:2099", true);
    $session = $rpc->session;
            try {
                $result1 = yield $session->test1();
                $result2 = yield $session->test2($result1);
                $session->testLog($result2);
            }catch (\Exception $e) {
                $session->testLog($e->getMessage());
                $session->testLog($e->getTraceAsString());
            }
}

Result:

string(19) "response read error"
string(885) "#0 D:\AppServ\www\test-hprose-laravel-client\vendor\hprose\hprose\src\Hprose\Socket\HalfDuplexTransporter.php(42): Hprose\Socket\Transporter->getLastError('response read e...')
#1 D:\AppServ\www\test-hprose-laravel-client\vendor\hprose\hprose\src\Hprose\Socket\Transporter.php(136): Hprose\Socket\HalfDuplexTransporter->asyncReadError(Object(stdClass), Resource id #235, 0)
#2 D:\AppServ\www\test-hprose-laravel-client\vendor\hprose\hprose\src\Hprose\Socket\Transporter.php(275): Hprose\Socket\Transporter->asyncRead(Resource id #235, Object(stdClass))
#3 D:\AppServ\www\test-hprose-laravel-client\vendor\hprose\hprose\src\Hprose\Socket\Client.php(107): Hprose\Socket\Transporter->loop()
#4 D:\AppServ\www\test-hprose-laravel-client\vendor\hprose\hprose\src\Hprose\Socket\Client.php(44): Hprose\Socket\Client->loop()
#5 [internal function]: Hprose\Socket\Client->__destruct()
#6 {main}"

服務端就是簡單一個swoole的程序:

<?php
    require_once "vendor/autoload.php";
    use Hprose\Swoole\Server;

    function session_testLog($text) {
        var_dump($text);
    }

    function session_test1() {
        return 'abc';
    }

    function session_test2($text) {
        return 'Input text: ' . $text;
    }

    $server = new Server('tcp://0.0.0.0:2099');
    $server->addFunction('session_getSession');
    $server->addFunction('session_testLog');
    $server->addFunction('session_test1');
    $server->addFunction('session_test2');
    $server->start();

hprose / hprose-php

協程中進行TCP異步調用，response read error #117