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Category Archives: www updates

What does browser caching means? Answer is save a copy of the web page  visited by the browser for a temporary period.So that any further  access to the same web page does not require the browser to repeatedly collect all the content from the webserver again.But This tends to create problem in case of Dynamic website where content tends to change in minutes time (or even in seconds time).  With browser cache enabled there might be chances that the old content is shown in the same page wheres the previous content has already been updated. There are two ways you can prevent a browser from caching a web page.

1. Meta tags

We use the following lines of htl code to prevent the browser from caching.

<meta http-equiv="expires" content="Fri, 05 Dec 2008 01:00:00 GMT"/>
<meta http-equiv="pragma" content="no-cache" />

This tells the browser that the cached copy of the we page is already  out of date. hence the on reaching this tag the browser will prevent itself from caching the page. The http-equiv=”pragma” plays the same role but is guaranteed to work on different browsers.

2. HTTP Headers

The other way around would be through the dynamic scripting language (like PHP)  header functions (Cache-Control) as shown below.HTTP 1.1 compliant browsers.

<?php
header('Expires:
Fri, 05 Dec 2008 01:00:00 GMT');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Cache-Control: post-check=0, pre-check=0', FALSE);
header('Pragma: no-cache');
?>

This post is adapted from my personal blog .

Well Its been a while since the Web 2.0 is in use that introduced a new trends in web development since its evolution. Web 2.0 as officially defined  says

“Web 2.0 is the business revolution in the computer industry caused by the move to the Internet as platform, and an attempt to understand the rules for success on that new platform”

Web 2.0 was more more about business logic application  that empasisis on implenting business application .It also brought about a latest innovations of the time such as communities,forums,social networks, and so on. Webservices and Ajax could be the major ones.

Web 3.0 says

“Web 3.0 is defined as the creation of high-quality content and services produced by gifted individuals using Web 2.0 technology as an enabling platform. ”

Now is the time for Web 3.0. So what is web 3.0  all about and what is something new in it? Well altough web 3.0 still not a final product.An evolutionary stage of the Web that follows Web 2.0. But as of now Web 3.0 promises to bring with it a huge change in the trend of the web development.

Web 3.0 all speaks of semantic web (i.e information and services on the web is defined).This is all set to make a clean way in the next generation of the WWW. So we could say that Web 3.0 is Artificial Intelligence Web based systems. Artificial Intelligence Technology is expected to make the web intelligent. Natural language processing will provide new innovation in buidling database system with a capabilty to convert information from computer databases into normal-sounding human language.

Web 3.0 is expected to give birth to following trends challenges in web arena during its stage of evolution and maturity.(courtesy by Nova Spivack)

  • ubiquitous connectivity, broadband adoption, mobile Internet access and mobile devices
  • the intelligent web, Semantic Web technologies such as RDF, OWL, SWRL, SPARQL, GRDDL, semantic application platforms, and statement-based datastores;
  • distributed databases, the “World Wide Database” (enabled by Semantic Web technologies); and
  • intelligent applications, natural language processing, machine learning, machine reasoning, autonomous agents.

Yahoo the world most popular messenger service has come up with its latest innovation. The facility is known as Pingbox allows you to embed a chating widget on your blog or website and let your visitors chat from the widgets right into your Yahoo IM. The system was introduced with Yahoo messenger 9 .

 pingbox

Next one in the race is Google. Google talk also has come up with a similiar concept called Gtalk chatback  badges. That works on a concept similiar to yahoo.
gtalk