# NSAPI 仅当在Netscape / iPlanet / Sun Web服务器中将PHP作为NSAPI模块运行时，这些功能才可用 - [预定义常量](https://www.php.net/manual/zh/nsapi.constants.php) - [NSAPI 函数](https://www.php.net/manual/zh/ref.nsapi.php) - [nsapi\_request\_headers](https://www.php.net/manual/zh/function.nsapi-request-headers.php)— 取得所有HTTP头部请求 - [nsapi\_response\_headers](https://www.php.net/manual/zh/function.nsapi-response-headers.php)— 获取所有HTTP响应标头 - [nsapi\_virtual](https://www.php.net/manual/zh/function.nsapi-virtual.php)— 执行NSAPI子请求 NSAPI实现了Apache模块的部分功能，以实现最大的兼容性。 **NSAPI实现的Apache函数** Apache函数（仅作为别名）NSAPI功能描述[apache\_request\_headers()](https://www.php.net/manual/en/function.apache-request-headers.php)[nsapi\_request\_headers()](https://www.php.net/manual/en/function.nsapi-request-headers.php)提取所有HTTP请求标头[apache\_response\_headers()](https://www.php.net/manual/en/function.apache-response-headers.php)[nsapi\_response\_headers()](https://www.php.net/manual/en/function.nsapi-response-headers.php)提取所有HTTP响应标头[getallheaders()](https://www.php.net/manual/en/function.getallheaders.php)[nsapi\_request\_headers()](https://www.php.net/manual/en/function.nsapi-request-headers.php)提取所有HTTP请求标头[virtual()](https://www.php.net/manual/en/function.virtual.php)[nsapi\_virtual()](https://www.php.net/manual/en/function.nsapi-virtual.php)使NSAPI成为子请求