Welcome!

Cognitive Computing Authors: Liz McMillan, Pat Romanski, Yeshim Deniz, Zakia Bouachraoui, Elizabeth White

Related Topics: Cognitive Computing

Cognitive Computing : Blog Feed Post

Friendly URL Redirection Scaling via iRules

Basically you want to make things in your application, on your website, etc. easier to access

The concept of a friendly URL is a pretty simple one. Basically you want to make things in your application, on your website, etc. easier to access. This stems from the fact that most applications these days make use of increasingly complex paths for a multitude of reasons. Whether it’s user specific content, auto generated pages or otherwise, typing in a URL that looks like “http://domain.com/a7391/users/0928179/events/live/release/20110403/regions.php?region=atl” isn’t something that’s easy or frankly even realistic for a user. I’m not going to remember that URL, and if I’m an 8 on the geek scale, certainly the 3s and 4s of the world won’t be able to manage that kind of a URL either. Nevertheless, these sort of paths are common amongst robust applications.

Enter friendly URL redirection. To combat the plague of uncivilized URLs many people, including DevCentral, turn to friendly URL redirection. That is, they make up a shorter, more usable URL and hand that out to users instead. Then, when a user accesses that URL, they get directed to the appropriate content. For instance, using the example above of a make believe user group in Atlanta “http://domain.com/ug/atl” might very well redirect me to the appropriate URL while being something humans can actually remember and reproduce when it comes time to type in a URL. To make this process even easier this is something that iRules can handle very smoothly. Simple HTTP::redirect lists in a switch or the like work great for getting started with this process, something like:

when HTTP_REQUEST {
switch -glob [string tolower ]HTTP::uri[] {
"/ug/atl" {
HTTP::redirect "http://[HTTP::host]/a7391/users/0928179/events/live/release/20110403/regions.php?region=atl"
}
"/ug/sea" {
HTTP::redirect "http://[HTTP::host]/a2416/users/0622375/events/live/release/20100602/regions.php?region=sea"
}
}
}

 

A very simple example, but you get the idea. Look for the short URL, redirect to the appropriate (usually longer, more complex) URL. All right, that’s well and good, but where does the scaling come into play, you ask? Well this concept is fine and dandy for 2 or 3 or even up to say 10 or 15 redirects. What if you have 100? 1000? Are you going to maintain a switch with 1000 cases? If your answer was yes turn off your computer, and go seek professional help. For those that are still here…of course you’re not. You’re going to find a way to make that management much simpler and re-use more generic logic.

As with most cases in an iRule when someone tells me they need to store several (more than a hundred, less than a million) records and parse through them at will, here will be using a class. With the semi-recent improvements to classes in both performance and scale they’re suited wonderfully to this kind of task. What we’ll need is a class that contains these mappings and some simple logic to parse the class, recall the key->value info as necessary and redirect based off of that. First the class:

   1: class "redirurls" {
   2:   "/ug/atl" {"/a7391/users/0928179/events/live/release/20110403/regions.php?region=atl"}
   3:   "/ug/sea" {"/a2416/users/0622375/events/live/release/20100602/regions.php?region=sea"}
   4:   "/ug/nyc" {"/a1753/users/0524611/events/live/release/20100714/regions.php?region=nyc"}
   5:   "/ug/la" {"/a6542/users/0316327/events/live/release/20100312/regions.php?region=la"}
   6: ...
   7: }

This could go on for however many entries you want, obviously. Also note that not all of them must be in the same format. It’s just coincidence (and efficiency) that my examples all look the same. It could be any incoming URI you want to redirect. Now that we have a class to parse, we need an iRule to do the parsing. This is a pretty simple setup but that’s kind of the idea:

 

   1: when HTTP_REQUEST {
   2:   set newuri [class match -value ]string tolower [HTTP::uri][ equals redirurls]
   3:   if {$newuri ne ""} {
   4:     HTTP::redirect "http://[HTTP::host]$newuri"
   5:     unset newuri
   6:   }
   7: }

As you can see the actual iRules code required is extremely simple. All you need is a class match to return the value in the class when searching based on the URI that’s coming in. If there’s a match, the HTTP::redirect fires and sends the user to the appropriate URI and they’re on their way. There are hundreds of tweaks, customizations and embellishments that could be made here, so feel free to think outside the box. This is just a basic look at the concept. From here the sky’s the limit.

So there you have it, a scalable way to handle Friendly URL Redirection via iRules.

Read the original blog entry...

More Stories By Colin Walker

Coming from a *Nix Software Engineering background, Colin is no stranger to long hours of coding, testing and deployment. His personal experiences such as on-stage performance and the like have helped to foster the evangelist in him. These days he splits his time between coding, technical writing and evangalism. He can be found on the road to just about anywhere to preach the good word about ADCs, Application Aware networking, Network Side Scripting and geekery in general to anyone that will listen.

Colin currently helps manage and maintain DevCentral (http://devcentral.f5.com). He is also a contributor in many ways, from Articles to Videos to numerous forum posts, to iRules coding and whatever else he can get his hands on that might benefit the community and allow it to continue to grow.

IoT & Smart Cities Stories
Druva is the global leader in Cloud Data Protection and Management, delivering the industry's first data management-as-a-service solution that aggregates data from endpoints, servers and cloud applications and leverages the public cloud to offer a single pane of glass to enable data protection, governance and intelligence-dramatically increasing the availability and visibility of business critical information, while reducing the risk, cost and complexity of managing and protecting it. Druva's...
At CloudEXPO Silicon Valley, June 24-26, 2019, Digital Transformation (DX) is a major focus with expanded DevOpsSUMMIT and FinTechEXPO programs within the DXWorldEXPO agenda. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throug...
BMC has unmatched experience in IT management, supporting 92 of the Forbes Global 100, and earning recognition as an ITSM Gartner Magic Quadrant Leader for five years running. Our solutions offer speed, agility, and efficiency to tackle business challenges in the areas of service management, automation, operations, and the mainframe.
The Jevons Paradox suggests that when technological advances increase efficiency of a resource, it results in an overall increase in consumption. Writing on the increased use of coal as a result of technological improvements, 19th-century economist William Stanley Jevons found that these improvements led to the development of new ways to utilize coal. In his session at 19th Cloud Expo, Mark Thiele, Chief Strategy Officer for Apcera, compared the Jevons Paradox to modern-day enterprise IT, examin...
With 10 simultaneous tracks, keynotes, general sessions and targeted breakout classes, @CloudEXPO and DXWorldEXPO are two of the most important technology events of the year. Since its launch over eight years ago, @CloudEXPO and DXWorldEXPO have presented a rock star faculty as well as showcased hundreds of sponsors and exhibitors! In this blog post, we provide 7 tips on how, as part of our world-class faculty, you can deliver one of the most popular sessions at our events. But before reading...
DSR is a supplier of project management, consultancy services and IT solutions that increase effectiveness of a company's operations in the production sector. The company combines in-depth knowledge of international companies with expert knowledge utilising IT tools that support manufacturing and distribution processes. DSR ensures optimization and integration of internal processes which is necessary for companies to grow rapidly. The rapid growth is possible thanks, to specialized services an...
At CloudEXPO Silicon Valley, June 24-26, 2019, Digital Transformation (DX) is a major focus with expanded DevOpsSUMMIT and FinTechEXPO programs within the DXWorldEXPO agenda. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throug...
There are many examples of disruption in consumer space – Uber disrupting the cab industry, Airbnb disrupting the hospitality industry and so on; but have you wondered who is disrupting support and operations? AISERA helps make businesses and customers successful by offering consumer-like user experience for support and operations. We have built the world’s first AI-driven IT / HR / Cloud / Customer Support and Operations solution.
Codete accelerates their clients growth through technological expertise and experience. Codite team works with organizations to meet the challenges that digitalization presents. Their clients include digital start-ups as well as established enterprises in the IT industry. To stay competitive in a highly innovative IT industry, strong R&D departments and bold spin-off initiatives is a must. Codete Data Science and Software Architects teams help corporate clients to stay up to date with the mod...
Scala Hosting is trusted by 50 000 customers from 120 countries and hosting 700 000+ websites. The company has local presence in the United States and Europe and runs an internal R&D department which focuses on changing the status quo in the web hosting industry. Imagine every website owner running their online business on a fully managed cloud VPS platform at an affordable price that's very close to the price of shared hosting. The efforts of the R&D department in the last 3 years made that pos...