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Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...息及时性的前提下，根据网络类型自适应的找出保活信令TCP连接的尽可能大的心跳间隔，从而达到减少安卓微信因心跳引起的空中信道资源消耗，减少心跳Server的负载，以及减少部分因心跳引起的耗电。
主要方法是参考WhatsApp...
CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...于缓存服务器通常部署在靠近用户端，所以能获得近似局域网的响应速度，并有效减少广域带宽的消耗。据统计，Internet上超过80%的用户重复访问20%的信息资源，给缓存技术的应用提供了先决的条件。缓存服务器的体系结构与Web...
CGRidCtrl控件 学习心得 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，Ctrl-A全选
u 当单元格成为焦点，并且在单元格的编辑区域按下字符键，就意味着在
那个单元格进行编辑了
u 可以在单元格中加入图片
u 对大型数据可以使用"虚拟"模式
u 充分的打印支持，支持文档/浏览环境（包括打印...
Freeing up a TCP/IP port?
...tening for http requests on port 80 (run as root or use sudo):
# fuser 80/tcp
If you want to kill them, then just add the -k option.
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Can't connect to localhost on SQL Server Express 2012 / 2016
... If not, start it.
You need to make sure that SQL Server is allowed to use TCP/IP or named pipes. You can turn these on by opening the SQL Server Configuration Manager in Start > Programs > Microsoft SQL Server 2012 > Configuration Tools (or SQL Server Configuration Manager), and make sure ...
Keep-alive header clarification
...this info kept ("this connection is between computer A and server F")?
A TCP connection is recognized by source IP and port and destination IP and port. Your OS, all intermediate session-aware devices and the server's OS will recognize the connection by this.
HTTP works with request-response: cli...
Who is listening on a given TCP port on Mac OS X?
On Linux, I can use netstat -pntl | grep $PORT or fuser -n tcp $PORT to find out which process (PID) is listening on the specified TCP port. How do I get the same information on Mac OS X?
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Can two applications listen to the same port?
... differs depending on what OS is being considered. In general though:
For TCP, no. You can only have one application listening on the same port at one time. Now if you had 2 network cards, you could have one application listen on the first IP and the second one on the second IP using the same port ...
When is TCP option SO_LINGER (0) required?
...TIME_WAIT state, tying up all the available resources on a server.
When a TCP connection is closed cleanly, the end that initiated the close ("active close") ends up with the connection sitting in TIME_WAIT for several minutes. So if your protocol is one where the server initiates the connection c...
Why is SCTP not much used/known
...Stevens and I found that there is a third transport layer standard besides TCP and UDP: SCTP .
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