之间的区别是什么：

头设置连接保持活动

和

的KeepAlive上

在Apache的htaccess的？

in Apache htaccess?

什么code，我们必须放在一个PHP文件的头选项？什么htaccess的文件吗？

What code and options we have to put in the header of a php file? And what in htaccess file?

推荐答案

如果您简单地将头连接：保持活动它不会是不够的。客户端将认为这是一个保持活动连接，但服务器可以决定关闭连接。此外，客户端不知道有多少请求可以通过保持活动连接提供服务。还有用于跟踪通过保持活动连接，看起来像这样的请求报文的附加头：

If you simply set the header Connection: keep-alive it isn't going to be enough. The client will think it's a keep-alive connection but the server may decide to close the connection. Additionally, the client doesn't know how many requests can be served through the keep-alive connection. There's an additional header that is used to track requests sent through a keep-alive connection that looks like this:

Keep-Alive: timeout=15, max=100

它告诉客户端，它最多可发送100个请求对当前保持活动连接（和倒计时，你继续使用表示保持活动连接），客户端有15秒的时间做出任何additioanl连接前请求被关闭。

which tells the client that it can send up to 100 more requests on the current keep-alive connection (and it counts down as you continue to use said keep-alive connection) and that the client has 15 seconds to make any additioanl requests before the connection is closed.

只需用头不足以建立永葆连接，因为服务器需要协商的。两端需要了解的保活和两端需要做适当的会计。你需要告诉Apache处理保活在它的结束，简单地发送头是不会做的。您需要打开保活在使用第二个指令：

Simply using the header isn't sufficient to establish a keep alive connection because the server needs to negotiate it. Both ends need to know about the keep-alive and both ends need to do proper accounting. You need to tell apache to handle keep-alive on its end and simply sending the header isn't going to do that. You need to turn keep-alive on using the second directive:

KeepAlive on

，另外，你可以调整保活机制，类似指令：

And additionally, you can tweak the keep-alive mechanism with directives like:

KeepAliveTimeout 15
MaxKeepAliveRequests 100