Interactive Rich Media

Amazon CloudFront is a web service for content delivery. It integrates with other Amazon Web Services (mainly Amazon S3) to give developers and businesses an easy way to distribute content to end users with low latency, high data transfer speeds, and no commitments.

Amazon CloudFront delivers the content using a global network of edge locations. Requests for  objects are automatically routed to the nearest edge location, so content is delivered with the best possible performance. Amazon CloudFront works seamlessly with Amazon Simple Storage Service (Amazon S3) which durably stores the original, definitive versions of the files.

In Amazon CloudFront, objects are organized into distributions. A distribution specifies the location of the original version of the objects. A distribution has a unique CloudFront.net domain name  that  can be used to reference an objects through the network of edge locations. It’s also possible to map an own domain name to a distribution.

Amazon CloudFront is

• fast
• simple
• cost-effective
• elastic
• reliable
• global
• designed for use with other Amazon Web Services

The price depends on the edge location and the volume transferred. The mean price per GB for low volumes is about 0,2$, for high volumes about 0,1$. A simple monthly AWS bill calculator is provided by Amazon. Normal fees will apply for Amazon S3 usage, including “origin fetches” – data transferred from Amazon S3 to edge locations.

The edge locations in Europe are:

• Amsterdam
• Dublin
• Frankfurt
• London

Amazon CloudFront is designed for delivery of objects that are frequently accessed – “popular” objects. Objects that aren’t accessed frequently are less likely to remain in CloudFront’s edge locations’ caches. Thus, for less popular objects, delivery out of Amazon S3 (rather than from CloudFront) is the better choice. Amazon S3 will provide strong distribution performance for these objects, and serving them directly from Amazon S3 saves the cost of continually copying less popular objects from Amazon S3 to the edge locations in CloudFront.

To delete and remove all existing post revisions entries and rows from WordPress database posts table, login to phpMyAdmin, select the appropriate WordPress database and then issue the following command :

DELETE FROM wp_posts WHERE post_type = “revision”;

To turn off and disable automatic post revisions, simply add the following line of code to wp-config.php file located in the root or home directory of WordPress blog:

define(’WP_POST_REVISIONS’, false);

If a new window is created by an user action, it will not be blocked by the browser’s popup blocker.

The dimensions (width & height) of the popup window are required, the other parameters are optional:

• left & top :  the distance from the top and left side of the screen
• toolbar :  if the popup should have a set of navigation buttons across the top
• location :  if the popup should have a location bar where the URL is displayed
• directories :  if the popup should have a row across the top with buttons to popular web sites
• status : if the popup should have a status bar across the bottom
• menubar : if the popup should have a menu
• scrollbars : if the popup should have scroll bars
• resizable : if users can resize the popup
• dependent : if the popup should close when its opener window closes
• full screen : how to open a full screen popup

The popup script has the following format:

window.open(href, windowname,

‘width=400,height=200,scrollbars=yes’);

An example is given below: