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  Handle NXDomain error when resolving IP address in Ruby DNS resolver

In another post, we covered how to resolve SystemStackError when resolving IP address in Ruby. In this post, we would cover another common issue where a NXDomain error is returned when resolving an IP address. The NXDomain error means that the queried domain name does not exist in the DNS. In Ruby, DNS resolver library will use /etc/resolv.conf by default get the name servers to resolve the domain name. There are multiple DNS name servers can be specified in /etc/resolv.conf with below format. ...

   RUBY,RUBY ON RAILS,NETWORK,DNS,NXDOMAIN     2017-07-16 01:39:23

  OpenLDAP Proxy -- rwm-map vs map

OpenLDAP proxy is used to proxy ldap request and response between clients and servers, different servers may have different representations/attributes to mean the same thing. For example, in one LDAP server, the firstName may be represented by firstName, it may be represented by givenName in a different server. However, from the client perspective, it only wants to get the firstName, it doesn't care about the backend attributes. In this case, attribute mapping can help provide a virtual view of ...

   MAP,OPENLDAP,OPENLDAP PROXY,LDAP,RWM-MAP     2018-02-02 20:36:02

  Can you learn to invest successfully using your smartphone?

Got some spare cash saved away, and want to start looking into building a financial portfolio and perhaps investing for your future? Putting your smartphone to good use every now and again, and spending your time on it productively rather than just for mindless social media scrolling and games, can actually help you to reach a better financial position before you’ve even noticed. For those interested, here are a few different tips on how you can learn to invest successfully using your smar...

   PROMOTION,SMARTPHONE,INVESTMENT     2020-07-01 00:37:42

  Different types of keystore in Java -- DKS

Domain KeyStore(DKS) is a keystore of keystore. It abstracts a collection of keystores that are presented as a single logical keystore. Itself is actually not a keystore. This new keystore type is introduced in Java 8. There is a new class DomainLoadStoreParameter which closely relates to DKS. To load different keystores into the single logical keystore, some configuration is needed. Here is the format of the configuration for grouping different keystores. domain [ ...] { keystore [ ....

   Java,keystore,DKS,tutorial     2015-01-20 02:27:27

  A Sip of Go Log

Logging is indispensable in any code that we need its support both in debugging and in statistics. However, a package that filled withfmt.Println/fmt.Printf printing various messages can never be considered a read-to-be-adopted package, which can be optimized by a simple change, using Golang’s native log package to print information to standard output or to a file. Then, how to apply the log package? Are there any limitations? If so, can we seek open-source packages? Let&rsq...

   GOLANG,LOGGING     2022-06-16 05:43:24

  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

  Native Client Brings Sandboxed Native Code to Chrome Web Store Apps

Wouldn’t it be great if you could create web apps using your existing C and C++ code? Native Client lets you do just that, and it is now enabled for Chrome Web Store apps in Google Chrome’s beta channel. Native Client apps live on the web platform, so you don’t need to create separate versions of your app for each operating system. Rather than relying on OS-specific APIs, Native Client apps use Pepper, a set of interfaces that provide C and C++ bindings to the capabilities o...

   C++,Web application,Native Client,Useful     2011-08-24 02:23:03

  Going Simple with JavaScript

I was making a change to a page that needed to pull from a remote API and make changes to various parts of the page. Sounds like the time to pull out jQuery and Ajax, doesn't it? Instead, I just used old fashioned JavaScript. Actually, I used new fashioned JavaScript. Browsers haven't stood still in the advent of libraries and frameworks. As a result, we can take advantage of those features when we need to bake in a little extra. Some JSONP The first step was to get the JSONP call execu...

   JavaScript,new version,new addition,JSONP,querySelectorAll     2012-03-06 05:22:59

  5 Must See HTML5 Sites

With the release of the iPad, HTML5 technology has recently come into the spotlight.  The format that will likely kill Adobe’s Flash is a lot of fun to use, but we’ve  not seen much of it yet. The good news is that you don’t have to wait until the iPad is in your hands to see what HTML5 can do.  If you have a compatible browser, there are already a wealth of sites that show off the capabilities. First, make sure that you have a browser that is capable of ...

   HTML5,Web,Website,Demo     2011-07-01 11:24:44

  Why cannot Renren be China's Facebook?

Yizhou Chen, CEO of China's SNS community Renren, shouted "one war, three battles". We do not know now how the battle progresses. Currently Renren's net market value is $1.3 billion where 900 million of them are in cash, it means the market values Renren 400 million US dollars only which is far lower than Facebook. Why cannot Renren be China's Facebook? This is a very interesting topic, many users share their opinions, Some of the main points are summarized as follows:Facebook pay more attentio...

   Renren, Facebook,SNS     2012-11-22 11:44:33

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