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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议
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How are ssl certificates verified?
...ted certificate authority.
The certificate contains the domain name and/or ip address of the web server. Your web browser confirms with the certificate authority that the address listed in the certificate is the one to which it has an open connection.
Your web browser generates a shared symmetric k...
UDP vs TCP, how much faster is it? [closed]
...dges a set of packets, calculated by using the TCP window size and round-trip time (RTT).
For more information, I recommend the simple, but very comprehensible Skullbox explanation (TCP vs. UDP)
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Cookies vs. sessions
...omes invalid. If it was all based on cookies, a user (or hacker) could manipulate their cookie data and then play requests to your site.
Edit: I don't think there is any advantage to using cookies, other than simplicity. Look at it this way... Does the user have any reason to know their ID#? Ty...
Master-master vs master-slave database architecture?
... this is that it is very hard to preserve absolute consistency. See the wikipedia article for more.
Wikipedia seems to have a nice summary of the advantages and disadvantages
Advantages
If one master fails, other masters will continue to update the
database.
Masters can be located ...
403 Forbidden vs 401 Unauthorized HTTP responses
...as. I typically use this status code for resources that are locked down by IP address ranges or files in my webroot that I don't want direct access to (i.e. a script must serve them).
– Kyle
May 9 '13 at 13:20
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程序员保值的4个秘密 - 杂谈 - 清泛网 - 专注C/C++及内核技术
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相当大一部分的程序员都在做应用层面的开发，所做的软件用来解决特定场景的问题，给用户的工作和生活带来方便。
开发一个应用，经常会用到高级语言和框架，比如 C# 和 .NET ，比如 C++ 和 Qt ，比如 J2EE ，比如 Ruby on Rails ...
OnInitUpdate、OnUpdate、OnDraw与OnPaint - C/C++ - 清泛网 - 专注C/C++及内核技术
...清理工作。
在单文档结构中上面两点尤其重要，因为软件运行文档对象和视对象只会被产生并删除一次。所以应该将上面两点和C++对象构造和构析分清楚。
最后将一下文档模板（DocTemplate）的作用，文档模板分为两类单文...
What's the difference between streams and datagrams in network programming?
...datagram socket when order is less important than timely delivery (think VoIP or game protocols), when you don't want the higher overhead of a stream (this is why DNS is primarily a datagram protocol, so that servers can respond to many, many requests at once very quickly), or when you don't care to...
Using Custom Domains With IIS Express
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You could also use a URL like http://jam.127.0.0.1.xip.io/ if you don't want modify your hosts file. Plus, any collaborators won't need to modify theirs. See xip.io.
– Zack Martin
Aug 11 '16 at 16:12
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