我的应用程序在本地开发计算机和其他两个云服务器上运行正常。
但是在客户端的云上，它位于防火墙之下，因此出现TCP错误：
PHP Fatal error:
Uncaught exception 'Zend_Http_Client_Adapter_Exception'
with message 'Unable to Connect to tcp://mydomain.com:80.
Error #110: Connection timed out' in /path/to/proj/library/Zend/Http/Client/Adapter/Socket.php:235
Stack trace:
#0 /path/to/proj/library/Zend/Http/Client.php(973): Zend_Http_Client_Adapter_Socket->connect('mydomain.com', 80, false)
#1 /path/to/proj/library/Zend/Rest/Client.php(137): Zend_Http_Client->request('GET')
#2 /path/to/proj/library/Rbs/DataSource/Dao/Service.php(17): Zend_Rest_Client->restGet('hrm/api/employe...', Array)
#3 /path/to/proj/Application/Models/EmployeeManager.php(13): Rbs_DataSource_Dao_Service->fetch('hrm/api/employe...', Array)
#4 /path/to/proj/Application/Models/Employee.php(16): Application_Models_EmployeeManager->fetch('hrm/api/employe...')
#5 /path/to/proj/library/Rbs/Controller/Action/Base.php(69): Application_Models_Employee->fetch('hrm/api/employe...')
#6 /path/to/proj/libr in /path/to/proj/library/Zend/Http/Client/Adapter/Socket.php on line 235, referer: http://mydomain.com/hrm/
那么，问题是如何通过防火墙并让应用程序为这些请求工作？