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linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...也可以解决多用户需要同时访问外网但公有IP地址不足的问题。同时可以作为一个防火墙，隔离内网与外网，并且能提供监控网络和记录传输信息的功能，加强局域网的安全性等。它的主要作用有以下几点。
1．共享网络
2．...
Difference between numpy.array shape (R, 1) and (R,)
... slowly. If you prefer this to be the other way round, you can specify the order parameter:
>>> c = a.reshape((3, 4), order='F')
which results in an array indexed like this:
i= 0 1 2 0 1 2 0 1 2 0 1 2
j= 0 0 0 1 1 1 2 2 2 3 ...
$.focus() not working
...for your other one, the one thing that has given me trouble in the past is order of events. You cannot call focus() on an element that hasn't been attached to the DOM. Has the element you are trying to focus already been attached to the DOM?
...
What is the appropriate HTTP status code response for a general unsuccessful request (not an error)?
...ful API that will process a number of user interactions, including placing orders using stored credit cards.
7 Answers
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How do I prevent node.js from crashing? try-catch doesn't work
From my experience, a php server would throw an exception to the log or to the server end, but node.js just simply crashes. Surrounding my code with a try-catch doesn't work either since everything is done asynchronously. I would like to know what does everyone else do in their production servers.
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Foreign key constraints: When to use ON UPDATE and ON DELETE
... "I wouldn't want a customer delete to wipe out the financial data for the orders he had previously." In a situation like that, you probably still need the customer's data anyway. Your design should probably be marking the customer as inactive, not deleting their row from the database. In practice...
How to find memory leak in a C++ code/project?
...in C++
to overload and/or redefine operator
new and operator delete in order to
intercept the memory allocation and
deallocation calls, and thus debug a
program for memory usage. It often
involves defining a macro named
DEBUG_NEW, and makes new become
something like new(_FILE_, _LINE...
How do I set the UI language in vim?
...ystem, but with German semantics for letters, except that the default sort order is ASCIIbetical (ie. sort by codepoint, not according to language conventions). You could use a different variation; see man 7 locale for more.
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Python extending with - using super() Python 3 vs Python 2
...does is: it calls the method from the next class in MRO (method resolution order). The MRO for C is: (C, A, B, object). You can print C.__mro__ to see it.
So, C inherits __init__ from A and super in A.__init__ calls B.__init__ (B follows A in MRO).
So by doing nothing in C, you end up calling both...
Setting the correct encoding when piping stdout in Python
...ad and permanent choice of encoding on stdout at startup time, might be in order to prevent any badly encoded stuff coming out later on. Or changing it is just an unimplemented feature, in which case allowing the user to change it later on would be a reasonable Python feature request.
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