HTML5 Link Prefetching

Link prefetching is used to identify a resource that might be required by the next navigation, and that the user agent SHOULD fetch, such that the user agent can deliver a faster response once the resource is requested in the future.

<link rel="prefetch" href="" />

<link rel="prefetch" href="/images/sprite.png" />

Supported in:

  • MSIE 11+/Edge
  • Firefox 3.5+ (for HTTPS)
  • Chrome
  • Opera


Eclipse FileSync plugin

I’ve done a lot of front-end java coding over my career,  one particularly annoying aspect is the wait for a build (compile-deploy) cycle in my local developement servers to view or test a small change.  One particularly useful tool that I’ve been using for some time is a FileSync plugin for Eclipse.  It is useful as you can “map” folders from your Eclipse project to a path on your local filesystem, as such the individual files are automatically copied to your server installation.  I’ve personally used this approache with JBoss, Tomcat and WebSphere, but there is no reason that it should not work for other servers.

Setup of Static IP addresses on Ubuntu

In these examples, I have used the OpenDNS servers, please change as appropriate.

sudo vi /etc/network/interfaces

Example contents:

auto l0 eth0
auto lo
iface lo inet loopback
iface eth0 inet static
dns-search home

sudo vi /etc/resolv.conf

NOTE: I’m not 100% sure if this is required!
Add appropriate content, example:

search home

sudo restart networking
sudo ifdown eth0 && ifup eth0
sudo restart


HTTP Cookie Header

Obviously “Cookies” have a lot of advantages in web applications to maintain “state”, unfortunately using standard server configurations leads to even static content serving them up un-necessarily wasting some (minimal) bandwidth.

Adding the following to the Apache httpd.conf file is a start:
#Remove Cookie from all static content (except HTML as javascript could use it)
<FilesMatch "\.(html|htm|js|css|gif|jpe?g|png|pdf|txt|zip|7z|gz|jar|war|tar|ear|java|pac)$">
<IfModule header_module>
Header unset Cookie



Enerjy plugin for Eclipse IDE

I’ve previously written on the benefits of static analysis of java code with the use of PMD and FindBugs.  I was recently turned on to a new tool that performs similar testing of code within the Eclipse IDE.

When I first found this tool it was free, since that time it’s come out of beta and is now a little costly, but it may still be worth it due to the functionality it provides.

The premise of this tool is a little different than other ones, while it covers much of the same need, it also performs many tests that I would previously use CheckStyle to do.  This only provides them at runtime and in a common manner within the IDE.



Configuring Apache webserver for browser caching of web content…

This is a HUGE topic, I’ve outlined some simple steps below as well as my initial configuration for you to start with…

NOTE: this is for simple ‘static’ content such as images, additional work is required for dynamic (program generated) content, such as that generated in PHP.

1. In ‘httpd.conf’ make sure the following line is uncommented.

LoadModule expires_module modules/

2.  In ‘httpd.conf’ add the following:

ExpiresActive On
### Expire images 1 day from when they’re accessed
ExpiresByType application/java-archive “access plus 1 day”
ExpiresByType image/gif “access plus 1 day”
ExpiresByType image/png “access plus 1 day”
ExpiresByType image/jpg “access plus 1 day”
ExpiresByType image/jpeg “access plus 1 day”
ExpiresByType image/x-icon “access plus 1 day”
ExpiresByType text/css “access plus 1 day”
ExpiresByType text/javascript “access plus 1 day”
ExpiresByType text/xml “access plus 1 day”
ExpiresByType application/xml “access plus 1 day”
ExpiresByType text/plain “access plus 1 month”

3. (Optional) Set default expiry of content in ‘httpd.conf’:

### Expire everything else 1 day from when it’s last modified
ExpiresDefault “modified plus 1 day”

NOTE: These we’re my original settings, you may want to add attitional MIME type and expiry configurations particular to your web content.