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Content based HTTP Cache
Browsers may cache the webpages we visited, when user types a URL on the address bar, the browser may cache the webpage returned from server while displaying it. If there is no update on the webpage, then next time when the browser requests the same page, it will not download the page again, instead it will load the cached page. If the website explicitly specify that the page is updated, then the browser will download the page again from the server. What's HTTP Cache? You may be familiar with th...
HTTP Cache,Web crawler 2013-05-24 05:12:59
An experience of fixing a memory-corruption bug
During the last 4 months, I was disturbed by a memory-corruption bug, and this bug will cause program crash. Until last Monday, I found the root cause and fixed it. This debug process is a difficult but memorable experience, so I will share it in this article. My program works as a SMS Hub. When it receives a SMS, it will allocate a structure in heap memory like this: typedef struct { ...... int *a[8]; ...... } info; After processing the SMS, the program will free the m...
c, debug, unix, solaris, multi-thread 2014-05-04 03:52:43
Hide a file in a picture
Sometimes if you want to hide some important files on your computer which you don't want others to see, how would you do that? Find a professional tool? Set password for some folders? Change the file properties to hidden? They are possible, but they may not be so convenient or so secure. Here we share with you how to hide a file in a picture. Prerequisites 1 picture for example : test.jpg 1 test file, for example : test.txt WinRAR Steps Prepare the picture test.jpg and test file test.txt Use ...
Trick,Picture,Fil hiding,WinRAR 2012-09-13 19:36:36
Microsoft forms a new subsidiary focused on open source called Microsoft Open Technologies
Microsoft once again changes its attitude and intends to set up an open technology subsidiaries in order to promote the formulation of open-source projects and standards.The new company name is Microsoft Open Technologies and Jean Paoli, Microsoft executives will be the president of the new company. The company will also form interoperability strategy team in the future. The newly established company will have about 50-75 employees.Over the years, Microsoft has been considered to be the rival of...
Microsft,Open source,Microsoft Open Technologies 2012-04-13 06:10:45
Why can System.out.println be used to exit while loop
Let's first take a look at one simple Java thread code snippet which is supposed to exit the while loop after the first loop run. public class StopThread { private static boolean stopRequested; public static void main(String[] args) throws InterruptedException { Thread backgroundThread = new Thread(new Runnable() { @Override public void run() { int i = 0; while (!stopRequested) { i++; } } }); backgroundThread.start(); TimeUnit.SECONDS.sleep(1); stopRequested = true; } } But the tr...
In iOS6, no need to enter password for downloading free apps
In this coming autumn, Apple will release iOS6. User experience for downloading free apps or upgrading apps will be largely improved. Users are no longer required to enter password again when downloading free apps or upgrading downloaded apps(free or paid). This means that users only need to enter password when downloading paid apps.In iOS5, users need to enter password when they download or upgrade apps.In iOS6, if users want to download free apps, they only need to click the "Free" butto...
Only 4G can resolve the conflicts between China Telecom Carriers and WeChat ?
Why WeChat has made the three big Chinese telecom companies uncomfortable? Let's analyze from both technical and commercial levels. From a technical point of view, Mr. Huang, Dean of China Mobile Research Institute, described the impact of "always online service" applications like WeChat. Instead of using technical terms, we will explain in simple vivid phrases. First, mobile QQ, or WeChat, will have their own "request frequency". These requests are sent to the carrier network, to check the re...
Welcome the new Google logo
Google today changed their logo, the new logo adopts the flat design with a lighter color scheme. Apart from these, there are no major changes on the font style, character color etc. Old logo New logo Along with the new logo, Google also released a new navigation menu that sits next to the Share and account info. The launcher, which looks just like the app launcher on Chrome OS, brings up an App grid with your favorite Google services. Actually, Google wanted to replace the top black navigati...
Google logo,Chrome OS,App menu 2013-09-19 23:06:36
Turn browser into notepad with one line of code
This is the code shared by Jose on codewall. When you type data:text/html, into the address bar of the browser and press enter, the browser will turn into a notepad which you can edit. Why it works? This uses Data URI’s format and it tells the browser to render HTML. But contenteditable is a property of HTML5, so this can only work in the web browser which supports this property. Here are some interesting contents. Some people make some changes to the code encouraged by the ide...
HTML5, Browser editor 2013-01-30 04:20:54
Hurry up!Upgrade your Windows 8 before February 1
Microsoft announced on its official blog the price to upgrade to Windows 8 Pro would increase from $40 to $200 starting from February 1.According to the data released by Microsoft at the CES conference, since on sales in October last year, 60 million copies of Windows 8 licenses are sold, but they did not disclose the specific amount of activation. In order to attract users to upgrade to Windows 8, Microsoft set the upgrade fee to $39.99.Microsoft said that the price would change as follows fro...
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