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Apache服务器关于KeepAlive的配置参数在/extra/httpd-default.conf这个文件中，涉及到3个参数：
#
# KeepAlive: Whether or not to allow persistent connections (more than
# one request per connection). Set to "Off" to deactivate.
#
KeepAlive On
#
# MaxKeepAliveRequests: The maximum number of requests to allow
# during a persistent connection. Set to 0 to allow an unlimited amount.
# We recommend you leave this number high, for maximum performance.
#
MaxKeepAliveRequests 100
#
# KeepAliveTimeout: Number of seconds to wait for the next request from the
# same client on the same connection.
#
KeepAliveTimeout 5
KeepAlive On，表示打开这个功能；
KeepAliveTimeout 5，表示HTTP底层的TCP连接成功之后，如果没有HTTP请求到来，超时时间是5秒；
KeepAliveTimeout的单位，可以使毫秒，millisecond。如果配置毫秒，需要在数字后面加一个postfix，ms。比如：
KeepAliveTimeout 2500ms
MaxKeepAliveRequests 100，表示在一个TCP连接中，最大支持的HTTP请求数量，100就是表示，HTTP的请求数量达到100后，TCP会强制中断。
要让此配置生效，需要先修改Apache的主配置文件httpd.conf：
Include conf/extra/httpd-default.conf
去掉这个配置文件前面的#，让其配置生效。最后重新Apache。
本文链接：https://cs.pynote.net/net/httpd/202204052/
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