The $_SERVER array contains the server variables, allowing us to interrogate the Accept HTTP header.

$_SERVER序列变量包含了服务器端变量，允许程序员重定义Accept HTTP头信息。

youdao

It is interesting to note that t can be extracted from the HTTP Date header that the server sends back to the client, together with the first time that the cookies are set.

我们注意到十分有趣的是，t可以从服务器返回到客户的HTTP Date标头中提取出来，与这个cookie第一次的设置一起。

youdao

Browsers use the HTTP header to satisfy many different kinds of requests with the same server-side code.

浏览器利用http头，通过相同的服务器端代码来满足不同类型的请求。

youdao

The 32-year-old, who played for Russain club CSKA Moscow earlier in his career, broke the deadlock with a header from captain Server Djeparov's free-kick and then stole in at the near post to convert a low cross.

CNN: STORY HIGHLIGHTS