Javascript 如何使用php从客户端获取套接字的headers请求

我对这件事很陌生。我只是想知道是否有可能获取web套接字客户端请求头。这里我指的是来自客户端的握手头。 提前谢谢你
如果我问的问题不清楚，很抱歉
我想要的是获得如下标题格式：

GET ws://websocket.example.com/ HTTP/1.1
Origin: http://example.com
Connection: Upgrade
Host: websocket.example.com
Upgrade: websocket

见：

上面应该返回如下所示的内容：

HTTP_HOST: testdrive 
HTTP_CONNECTION: keep-alive 
HTTP_CACHE_CONTROL: max-age=0 
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 
HTTP_USER_AGENT: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36 
HTTP_ACCEPT_ENCODING: gzip,deflate,sdch 
HTTP_ACCEPT_LANGUAGE: nl,en-US;q=0.8,en;q=0.6 
HTTP_COOKIE: __atuvc=1%7C8 

---

快速澄清，你想得到这样的东西吗<代码>Mozilla/5.0（Windows NT 6.3；Win64；x64）AppleWebKit/537.36（KHTML，类似Gecko）Chrome/39.0.2171.36 Safari/537.36

foreach ($_SERVER as $header => $value) {
    echo "$header: $value <br />\n";
}

HTTP_HOST: testdrive 
HTTP_CONNECTION: keep-alive 
HTTP_CACHE_CONTROL: max-age=0 
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 
HTTP_USER_AGENT: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36 
HTTP_ACCEPT_ENCODING: gzip,deflate,sdch 
HTTP_ACCEPT_LANGUAGE: nl,en-US;q=0.8,en;q=0.6 
HTTP_COOKIE: __atuvc=1%7C8