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程序员之网络安全系列（五）：数字证书以及12306的证书问题 - 更多技术 - ...
...个证书添加到操作系统里。
那么，问题来了，当你访问https://www.12306.cn 时，你就会得到下面的结果
这是为什么呢？
我相信你看完本文应该清楚，那是因为12306 自己给自己发了个证书，而这个证书默认是没有被操作系统信任...
When is the thread pool used?
...nchronous I/O is not always a thread pool, specifically in the case of the http module a different strategy appears to be used at this time. For our purposes here it's mainly important to note how the asynchronous context is achieved (by using libuv) and that the thread pool maintained by libuv is o...
How to check if a variable exists in a FreeMarker template?
...ter fit:
<#if userName?has_content>
... do something
</#if>
http://freemarker.sourceforge.net/docs/ref_builtins_expert.html
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follo...
Regex lookahead, lookbehind and atomic groups
...n succeed as s immediately follows in foots, and stop.
Some resources
http://www.regular-expressions.info/lookaround.html
http://www.rexegg.com/regex-lookarounds.html
Online testers
https://regex101.com
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To draw an Underline below the TextView in Android
...reate a drawable (hyperlink_underline.xml):
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:top="-10dp"
android:left="-10dp"
android:right="-10dp">
<shape android:shape="rectangle">
<solid android:color="@android...
What is Android keystore file, and what is it used for?
...ion about the signing process on the official Android documentation here : http://developer.android.com/guide/publishing/app-signing.html
Yes, you can sign several applications with the same keystore. But you must remember one important thing : if you publish an app on the Play Store, you have to s...
CSS: Set a background color which is 50% of the width of the window
... width: 50%;
height: 100%;
background-color: pink;
}
Example: http://jsfiddle.net/PLfLW/1704/
The solution uses an extra fixed div that fills half the screen. Since it's fixed, it will remain in position even when your users scroll. You may have to fiddle with some z-indexes later, to ...
How to delete a word and go into insert mode in Vim?
...ter, try: "change inner { block" and "change a { block".
Documentation at http://vimdoc.sourceforge.net/htmldoc/motion.html#text-objects
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follow...
Pandas dataframe get first row of each group
...nth(0) is the same as first()):
df.groupby('id').nth(1)
Documentation: http://pandas.pydata.org/pandas-docs/stable/groupby.html#taking-the-nth-row-of-each-group
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How can I create a link to a local file on a locally-run web page?
...s of many browsers (e.g. Firefox and Chrome) will refuse to cross from the http protocol to the file protocol to prevent malicious behaviour. You'll need to open your webpage locally using the file protocol if you want to do this stuff at all.
Why does it get stuck without file:///?
The first part...