Random thoughts

With most social networking sites offering birthday reminders, missing a friend's special day has become close to impossible, unless one of you completely abstains from social networks.

A chronologically sorted list of upcoming birthdays comes handy, and Facebook usually provides that. In the last week of the year, however, the sorting doesn't look quite right.

Dear Facebook, January does come before December but only in the same year:


At least you have a good excuse now if you missed a birthday this week.

PS. Have you noticed that Facebook informs you about your friends' birthdays even when they don't share that information on their profiles?

Labels: facebook, usability

When two men fight for their position in line at the fish stall,
When a truck and a car block each other at the car park and both drivers furiously refuse to back up,
When all the Briochekipferl are sold out as if everyone was going to have a Verhülltes Bauernmädchen for dessert this year,
Then it must be the most peaceful time of the year.



We wish you all the best for the holidays.

Frohe Weihnachten!
Merry Christmas!
Veselé Vianoce!
Joyeux Noël!
Feliz Natal!
کریسمس مبارک
圣诞节快乐!

Labels: personal

If you are like me and upgrade software only when there are critical security fixes or you badly need a few feature, you may have tried sticking to an older version of Yahoo! Messenger. I made the mistake of upgrading, and was almost cut off voice service for a few days. Fortunately, Yahoo! has a fix for the problem, which only seems to affect some users.

The new video calling capability in Yahoo! Messenger 10 didn't really draw my attention. Nevertheless I eventually gave in and allowed the automatic upgrade, if only to get rid of the nagging upgrade notice. At first everything seemed fine: The settings were copied over, and the user interface looked reasonably familiar. However, soon after, voice calls started failing with an obscure error message “Your computer is not connected to the network”. Restarting Yahoo! Messenger sometimes helped, but clearly this wasn't working as reliably as the previous version. “Works sometimes” wasn't good enough for me.

Yahoo! support was exceptionally helpful, within minutes the helpdesk agent had identified that I was running Yahoo! Messenger version 10.0.0.1270-us, which was the latest and greatest at the time but a few issues with voice telephony. He recommended uninstalling the current messenger and manually installing a slightly back-level version of Yahoo! Messenger 10, and disallow further automatic upgrades. The installation worked smoothly, and voice support in Yahoo! Messenger has been working flawlessly ever since.

Thank you, Yahoo! support.

Links:

• Yahoo! Messenger 10.0.0.1258-us for Windows installation file
• Yahoo! Messenger home

Labels: networking, technology, windows

When I embarked upon studying law in September last year, little did I know what to expect. How easily would I get back into learning? Which subjects would I find interesting? How much time would I be able to devote to studying besides job, family and teaching?

One year later I have answers to most of my questions. Getting back into the learning routine wasn’t too hard. The work commute has provided an excellent opportunity for reading text books (although they look somewhat shabby after a few round trips in the backpack). Watching the video streams in the narrow period during which they are made available turned out to be the biggest challenge, with soon-to-expire lectures piling up towards weekends and more than once requiring the family’s understanding and support.

One year later I am happy to report that things have been going well. I took most of the exams offered and passed with reasonable grades, and will soon have completed the first section of the program.

This week I attend the second lecture block at the Institut für Multimediale Linzer Rechtsstudien in Linz to learn about the courses offered in the upcoming years, to pick up more books and DVDs with recorded lectures, and to meet with other students.

Will this change what I do professionally? That question I haven’t answered yet, but it’s quite possible that one day it will. After I finish my courses, that is.

Labels: education, jku, personal

Today we take ubiquitous Internet access for granted and feel lost when our network connection briefly drops. It wasn't always like that.

On August 10, 1990, Austria became connected to the Internet with a 64 Kbit/s leased line between Vienna University and CERN in Geneva. Having Internet connectivity at one university didn’t mean everything moved to the Internet immediately.

The first online service I had used was CompuServe in 1985 while visiting friends in the UK. Watching the characters and occasional block graphics slowly trickle in over an acoustic coupler at 300 baud transfer rate was exciting (and expensive for my host). Back home, the post and telecom’s BTX service and Mupid decoders promised a colorful world of online content at “high speed”, relatively speaking, but most of the online conversations still happened on FidoNet, which was the easiest way to get connected. “His Master’s Voice” and “Cuckoo’s Nest” were my favorite nodes. At university our VAX terminals in the labs continued to run on DECNet, as did the university administration system. We learned the ISO/OSI reference model and RPC over Ethernet, but no word of TCP/IP. At work my 3279 terminal eventually gave way to an IBM PS/2 with a 3270 network card, and some foresighted folks in our network group Advantis and in IBM Research started putting gateways in place to link the mostly SNA connected mainframes with the Internet. The BITFTP service Melinda Varian provided at Princeton University opened another window to the Internet world (belatedly, Melinda, thank you!)

Meanwhile Tim Berners-Lee and Robert Cailliau made the first proposal for a system they modestly called the World Wide Web in 1989, and further refined it in 1990.

I don’t recall when I got my first Internet e-mail address and access to the Internet gateways after signing agreements that I wouldn’t distribute commercial information over NSFNet and only use the Internet responsibly, but it was only in 1994 when I took notice of the first Website, the now defunct Trojan Room Coffee Machine at the University of Cambridge, and another year before I had my first homepage and my own domain. As many Websites those days would read, “Welcome to the Internet”.

Happy 20th anniversary to the Internet in Austria!

Related links:

• 20 Jahre Internet in at – Die Revolution fraß ihre Kinder (derstandard.at)
• 20 Jahre Internet in Österreich (Futurezone interview with Austrian Internet pioneer Peter Rastl)
• 20 Years of Internet in Austria/20 Years of ACOnet Infrastructure

Labels: austria, technology

vienna.js, the Vienna JavaScript User Group meeting was held tonight at Metalab. Attendance wasn’t bad considering that it’s summer holiday season and lots of folks wouldn’t be in Vienna at this time of the year.

First, Matti Paksula from the University of Helsinki gave a mini-talk about SVG and JavaScript. Matti pointed out that canvas was unsuitable for shapes, “it’s for bitmaps, it’s not accessible, and it doesn’t scale”. Canvas isn’t all bad though; a combination of HTML 5, JavaScript, canvas and SVG is needed to replace Flash. (That probably means that Flash will be around for a while, despite the lack of support from some devices starting with an “i”.)

Demonstrations included the Canvas to SVG conversions and back as shown at SVG Open 2009, and a sneak preview on the latest version which runs completely client-side. Matti also mentioned the PottisJS SVG prototype library and showed an interactive SVG demo.

Next, Roland Schütz talked about JavaScript code management, specifically how to structure code and source files, implement an efficient workflow and automate the building (and testing) of JavaScript code. Roland mentioned a few nice tools for coding and testing JavaScript source code:

• gema general macro processor for pre-processing source files
• JSLint for code quality and consistency checks (for quick tests the online version of JavaScript Lint is quite useful, too)
• phpcpd to detect duplicate code
• Selenium for Web application testing

Roland welcomes followers on his newly created Twitter feed @rolandschuetz.

Finally, Lars Dieckow delivered an impromptu talk entitled “Sommerloch” about–Perl :-). More than fifteen years after the release of Perl 5.000, Perl 6 is just around the corner and the Rakudo Star release will be available from the usual sources starting tomorrow.

As a long time Perl programmer–the first Perl programs I touched were Perl 4 code and I am pretty sure there are some &function calls around still in code we use today–I hadn’t closely followed the development of Perl 6, and it was good to get an update on enhancements and changes in Perl 6 and a live demo of some of the new features after the talk.

Labels: events, javascript, perl, webdevelopment

“Human rights 2.0: Human rights in the information society” was the topic of two lectures in the series “Am Puls” by Dr. Jan Krone, professor for media science at the Fachhochschule St. Pölten, and Dr. Wolfgang Benedek, professor for public international law and international relations at the Karl-Franzens-Universität Graz.

Krone focused on freedom of the media, freedom of speech and data privacy in the European Union, pointing out that the Internet itself is not a mass medium but merely a communication channel that carries, amongst other things, media products: Individuals often gather information about others purely to satisfy their curiosity, and conversely share their personal information seeking for recognition. Companies mainly satisfy their business needs and sometimes manage to create “sect-like islands on the net like Apple does”, but generally lack the sensibility and awareness for data privacy needs. States need to balance the need for security and state intervention with the freedom of the people and basic rights.

In the following discussion, Krone suggested the Internet would eventually become fragmented along cultural or ideological borders, and Europe would have to build a European firewall similar to the Great Firewall in China (which uses technology from European IT and telecom suppliers). The audience strongly objected to the notion of a digital Schengen border, which goes against the liberal tradition in many European countries and doesn’t recognize the range of believes and the diversity within Europe.

Benedek talked about Internet governance and the role of the Internet Governance Forum (IGF), a “forum for multi-stakeholder policy dialogue”. Concepts for dealing with illegal activities and what is considered acceptable and appropriate encroachment upon basic rights such as those guaranteed by the European Convention on Human Rights (ECHR) vary between countries. Even more, what is illegal in one country may be perfectly legal and even socially accepted behavior elsewhere.

Touching on net neutrality and the digital divide, he mentioned that there is a push to make Internet access a human right and some countries have indeed added rights to participate in the information society to their constitutions. At the same time the copyright industry focuses on the three strikes model in the Anti-Counterfeiting Trade Agreement (ACTA) model as punishment for intellectual property violations.

ACTA is not the only threat to access for all though: Much content today is only available to people who understand English, and not all content is suitable for children or accessible to elderly people. How we can make the net accessible to people of all ages and qualifications, and in their native languages, remains a challenge.

Basic human rights, including the rights to education, freedom of speech and freedom of press, increasingly have a material dependency on the right to Internet access. As an audience member pointed out, “offline” studying at university is virtually impossible; long gone are the days of paper handouts and blackboard announcements.

Both speakers agreed that the right to privacy requires “educated decisions” by the people, and consequently educating people. The lectures and the following lively discussion last night served that purpose well.

Related links:

• Announcement “Menschenrechte 2.0 – Menschenrechte in unserer Informationsgesellschaft“
• Fonds zur Förderung der wissenschaftlichen Forschung (FWF)
• PR&D Kommunikationsdiensleistungen GmbH

Labels: education, events, privacy, society, technology

Google recently announced that they no longer support FTP publishing in Blogger after May 1, 2010, citing low usage and the drain on engineering resources as the reasons. The article also cited reasons why people wanted their blogs published on their site rather than going for the hosted solution.

If you are one of the .5% of bloggers who for whatever reason published via FTP or the more secure SFTP, you were left with a choice of moving your blog to blogspot.com or a custom domain name, or moving to another blogging platform. Importing your blog into WordPress is easy, WordPress has some nifty features that Blogger lacks, and you will easily find professionally designed WordPress themes, too, but switching to WordPress means going with the hosted solution on wordpress.com or installing and maintaining WordPress code on your server.

For those who want to stay with Blogger and have Blogger integrated into the Website there are two options, both requiring some hacking and configuration:

• Use the Blogger Data API to retrieve the blog in XML format and perform the rendering locally, most likely by processing the XML with XSLT stylesheets. While very flexible, this means losing the Blogger template capabilities.
• Build a reverse proxy that translates requests for blog resources to the correponding URL on Google's servers. The proxy solution gives flexbility with URL formats and also allows for tweaking the generated HTML code before sending it to the browser.

The Blogger proxy solution

Here is how it works:

1. Create backup copies of your blog in Blogger and on your server. The migration tool will update all previously published pages with a notice that your blog has moved, so you want to save the state of your blog first.
2. Create a secret hostname for your blog in a domain you control, say secretname.example.com, and CNAME this to ghs.google.com. Don't limit your creativity, although the name really doesn't matter much. The migration tool checks that secretname.example.com is CNAMEd to ghs.google.com during the migration.
3. Use the Blogger migration tool to move your blog to the new domain. At this point the blog will be up and running at secretname.example.com.
4. Install a proxy script on your site which intercepts requests, rewrites the request as needed and sets a Host: secretname.example.com header, sends the modified request to ghs.google.com and rewrites the response to correct absolute links, and optionally tweaks the generated HTML code before sending the response to the browser.
   
   
5. Configure the Webserver to invoke the script when no local content is available, for example in Apache
   
   RewriteEngine On
   RewriteRule ^$ index.html
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule . /bloggerproxy.php [L]
   
   
6. Google will eventually attempt to index your blog under secretname.example.com. To ensure a consistent appearance of the blog on your site, as the last step point secretname.example.com back to your Webserver and forward requests with that server name to your proxied blog using a 301 redirect.

Disclaimer: This solution is not for the faint of heart. It requires more changes and configuration than simply switching to a custom domain name, and isn't blessed or supported by Google. Use at your own risk.

Labels: google, web2.0, webdevelopment

Looping over a list of two values in Perl with for or foreach would seem trivial. What if the code suddenly appears stuck at the first value? That's exactly what happened with the Perl script below:

my $PROTOCOL = 'http';
for $PROTOCOL (qw(http https)) {
   dosomething();
}

sub dosomething {
   print "$PROTOCOL\n";
}

Even with use strict and warnings turned on, the script runs without warnings, but rather than printing http and https in sequence, it prints http twice!

As it turns out, after much debugging (the sample code is stripped down from a larger script which actually does something useful) and collectively scratching heads, this is indeed the documented behavior:

The foreach loop defaults to scoping its index variable dynamically in the manner of local. However, if the index variable is prefixed with the keyword my, or if there is already a lexical by that name in scope, then a new lexical is created instead.

Lessons learned:

1. After a decade of hacking Perl code, there's always something new to learn (and use strict doesn't stop the programmer from getting the scoping wrong).
2. Reading the documentation (sometimes) helps.
   

Labels: perl, technology

We wish everyone a Happy New Year 2010!

As we started the new year, we watched not only the fireworks but also the “blue moon”, as the rare occurrence of two full moons in one month is called. albeit incorrectly as Mayo noted. The next time we will see this astronomical phenomenon on a New Year's Eve will be in 2028. Unfortunately the weather conditions weren't too good, lots of clouds throughout the day and now dense fog.

2009 in retrospect

In January, organizational changes and painful staff reductions at work marked an unfortunate start of the year 2009. On a more positive note, the painter was almost done with the house, and we had a surprise party to celebrate Andrea’s birthday–the first in a series of round birthdays amongst friends and family–with rented tables and chairs in an otherwise empty house. With the beginning of the spring term, I also resumed teaching at Webster University in Vienna with courses in Web animation (yes, that’s mostly Flash development) and Web design principles.

February and March were mostly filled with going to furniture stores, chasing Kika to deliver the missing kitchen cupboard (and annoying everyone with frequent updates on the incorrect delivery, partial delivery, non-delivery) and running errands around the house.

On April 2 and 4. we moved to the new house with great help from Christian, Michael and Rainer. We were exhausted after hauling boxes and furniture. There was plenty of stuff left in the old apartments waiting to be moved in the months to come, and we were missing some furniture (did I mention a kitchen cupboard?) but immediately enjoyed living in our new home.

In May, Elias and Daniel welcomed their new cousin and gently put their arms around the newborn baby, very cute.

Our first real holiday trip with the kids in July started with a damaged engine and the desparate search for a replacement vehicle. Other than the rough start, we had a good time, enjoyed Italian cuisine, the sea and the nice sand beaches in Lido di Jesolo.

In August, Andrea and the kids spent some time with the grandparents in Salzburg, so I had the house to myself, which meant more visits to the hardware store and eventually getting all shelves in the basement properly secured.

With a week-long block course at the picturesque Burg Schlaining I started my legal studies at the Johannes Kepler Universität Linz in September. The degree program is suitable for distance learning and will take at least four years.

After a busy fourth quarter we were looking forward to the holiday season. This year for the first time we celebrated Christmas at our place instead of visiting family. Our plan was that Elias and Daniel would attend church in the afternoon with the grandparents while we decorated the tree on Christmas Eve; they were both so exhausted from the excitement about the holidays that they fell asleep instead. Judging from the expressions on their faces when they saw the tree, we did a good job :-)

Labels: personal

Today I attended the Internet Summit Austria 2009 held by the Internet Service Providers Austria association at the Austrian Academy of Sciences. The motto of the event was “We are Internet”, referring to the fact that the Internet is created by people and used by people.

ISPA chairman Andreas Koman opened the session with statistics about Internet use in Austria and an overview of current developments and challenges.

Claudia Bandion-Ortner, minister of justice, admitted her preference for paper files and reminded the audience that the Internet is not an area unregulated by law. There are legal issues specific to information technology, such as data theft and violation of data privacy rights. While fraudsters and other criminals use the Internet, most crimes are media neutral. One area that is closely linked to the Internet, though, is child pornography. Bandion-Ortner referred to the controversial German pilot for blocking access to illegal sites. Needless to say, the same filter technology could be used for censoring access to legitimate information or enforcing intellectual property rights.

Volker Grassmuck delivered a keynote about the reformation of intellectual property law in the digital age. Established “common sense” can block creativity and innovation. Some ideas worked well although most people would have assumed they wouldn’t:

• Shared space pioneered by Hans Moderman–“If you treat people like idiots, they will behave like idiots.”
• Shared code with the Free Software Foundation (FSF)
• Shared profits with the micro-payments of the Grameen bank– “People behave in a trustworthy way when they are trusted.”

Grassmuck touched on aspects of the digital age, the 40th birthday of the ARPANET and the 10th birthday of Napster this year, and the end-to-end principles in system design laid out by Saltzer, Reed and Clark at the MIT. Laboratory for Computer Science in 1984. The network is a universal transport mechanism, intelligence and innovation are at the ends of the network. “Today’s optimization is tomorrow’s bottleneck.”

On net neutrality Grassmuck mentioned a speech by FCC chairman Julius Genachowski and a refined view on the issue, with net neutrality but with network management to handle congestion or spam and with provisions for law enforcement, and transparency which would allow blocking or throttling certain types of traffic as long as customers are made aware.

There is no one solution that satisfies the needs of content producers, consumers and intermediaries. Working models will require a combination of an agreement between creative professionals and society, markets, free licenses, public subsidies and a “cultural flat rate”.

One of the conference gifts was, ironically, a USB stick with a locked down installation of Firefox using the Tor network to ensure privacy.

The keynote was followed by a lively discussion about intellectual property rights, including but not limited to compensation for the creator of content. The composer Johanna Doderer and the author Gerhard Ruiss pointed out that they want to maintain control over what happens with their works and reminded the audience that creative professionals are typically paid by how often their works sell. Georg Hitzenberger of Play.fm and Bettina Kann of the Austrian National Library outlined some of the challenges with obtaining rights for use in digital media and making content available. For example, the digital Web archive maintained by the Austrian National Library has unreasonably strict access requirements in selected locations only, one person at a time. Franz Schmidbauer touched on legal aspects and the adequacy of intellectual property rights enforcement.

MEP Eva Lichtenberger made an interesting comment about giving young people the ability to purchase digital media without requiring a credit card, quoting the large amounts spent on ringtones where suitable payment solutions are offered by telecom providers.

After the lunch break, Peter A. Gloor gave an entertaining presentation about “Coolhunting by Swarm Creativity” (that’s a lot of buzzwords for a title), explaining how their system combines different inputs–the wisdom of the crowd in the form of the Web, the wisdom of the swarms in the dynamics of fora and blogs, the knowledge in news and Wikipedia–to understand networks, trends and content. “Experts are right – in 50% of the cases. You never know which 50% you have.” swarmcreativity.net and ickn.org have good information about the concepts and the Condor software for non-commercial use.

Two panel discussions about social networks and business on the Internet concluded the agenda.

Labels: austria, events, technology, web2.0

Over twenty years after coming to Vienna to study computer science, I felt like going back to university and enrolled in a master's degree program in legal studies offered by the Institut für Multimediale Linzer Rechtsstudien at the Johannes Kepler Universität Linz.

The program started in early September with one week of lectures at the Burg Schlaining conference center. Besides getting an introduction into the concepts of law, registering and picking up the text books and DVDs, we had sufficient time for socializing and getting to know fellow students. On the first evening, the major invited to a reception at the town hall. I appreciated the warm welcome and thoroughly enjoyed the week, learning something new in the relaxed atmosphere of scenic Stadtschlaining and meeting nice people.

Having spent a good portion of my study period with checking bulletin boards distributed throughout the campus for announcements and organizing the study—the Web had not been invented—I was positively impressed how well things were organized here. The lectures and practice sessions are available on DVDs or as video streams, and textbooks are available for all courses, eliminating the need to take illegible notes.

What's nice about the program is the flexibility where and when you study. Of course that flexibility comes with the risk of procrastination, so feel free to ask me about my progress from time to time (read: no more than once a quarter!) as a gentle reminder.

Will I become a lawyer some day? Probably not. I haven't given much thought to how a law degree might change my career plans. Either way, it will be worth it to me.

Labels: education, jku, personal

Redirects are often discussed only in the context of search engine optimization (SEO). Here is a good example how redirects affect users as well, and why it is important to choose your redirects wisely.

The Central Intelligence Agency (CIA) in 2006 began serving its Website encrypted in an effort to improve security and privacy of the communication.

This is a clear case for a 301 redirect from the unencrypted URL http://www.cia.gov/page to the equivalent encrypted URL https://www.cia.gov/page. Instead, except for the homepage and very few other pages, all requests get redirected to a splash page informing visitors about the site changes:



Not only is this a bad idea for search since all those links out there on various sites now transfer link weight to a splash page which is marked as non-indexable. It is also an inconvenience to users who need to navigate to the specific content or go back to the previous page and try again with an edited link.

Even the old URL for the World Factbook, arguably one of the most popular resources on the site, no longer goes to the desired World Factbook homepage directly.

The CIA press release states: “We believe the inconveniences of implementing SSL for the entire website will be offset by increased visitor confidence that they are, in fact, connected to the CIA website and that their visits are secure and confidential.”

The effort to increased security and privacy is commendable, and encrypting all communication with the agency certainly isn't a bad idea. Doing so without the inconveniences would be even better though, and perfectly feasible, too.

Labels: networking, seo, technology

More often than not you will see someone recommend switching all redirects on your site to 301s because they pass “link equity” in Google. There is the simple and neat solution for search engine optimization, and it could be plain wrong. At the risk of diverging from the consensus in your favorite discussion forum or offending your SEO consultant, read on and decide for yourself.

Redirects instruct browsers and search engine crawlers that content is available under a different URL. They often go unnoticed as we access Websites. Along with the new location of the content, the server also sends a response code indicating the type of redirect. From an SEO perspective, you generally care about two response codes, 301 Moved permanently and 302 Found:

• 301 Moved permanently indicates that the resource has been assigned a different URL permanently, and the original URL should no longer be used. What this means for Search engines is that should index the new URL only. Google also transfers full link equity with a 301 redirect, which is the very reason why you will often see the advice to use 301 redirects.
• 302 Found indicates that the originally requested URL is still valid, and should continue to be used. Search engines vary in how they treat 302 redirects and which URL they show in search result pages, but generally will continue to crawl the original URL as recommended in the HTTP/1.1 specification: “The requested resource resides temporarily under a different URI. Since the redirection might be altered on occasion, the client SHOULD continue to use the Request-URI for future requests.”

Redirects are often used allow the publication of shorter or prettier “vanity” URLs. Shorter URLs are easier to scan and look much more enticing in the search engine results pages, and generally perform better according to MarketingSherpa's 2007 search marketing study and anecdotal evidence.

Choosing the right redirect response code

So which redirect response code should you use? Matt Cutts' description how Google treats on-domain and off-domain 302 redirects covers the basic principles and the heuristics that Google used at the time, which to a large extent still apply.

Let's summarize the effects of the two most common redirect status codes again:

• 301 redirects transfer link equity to the new URL.
• 301 redirects remove the original URL from the search index.
• 302 redirects often keep the original URL in the index.

The transfer of link equity is desirable in almost all cases. So the deciding factor really is whether you prefer the original URL in the index, and if that outweighs the disadvantages of potentially losing some link equity (more on that later).

The 301 redirect response is appropriate for the following scenarios:

• Content has moved to a different location permanently, for example to a different server name or a different directory structure of the same server. This may be triggered by the rebranding of content where you want all references to the original content to disappear.
• A Website is accessible under multiple host names, such as example.com and www.example.com, or typo catchers like eggsample.com and example.org, but only one name should be indexed.
• A temporary campaign URL is published in direct mail or print advertising, but the landing page has a different permanent URL that will remain accessible beyond the lifetime of the campaign.
• The requested URL does not match the canonical URL for the resource. Often extraneous session and tracking parameters can be stripped, or path information gets added to help with search rankings, for example http://www.amazon.com/Software-Development-Principles-Patterns-Practices/dp/0135974445

The 302 redirect response is the best choice for the following scenarios:

• The original URL is shorter, prettier, more meaningful, etc. and therefore should show on the search engine results page.
• Temporary session or tracking information gets added to the canonical URL. Those URL parameters should not be indexed since they will not apply to other visitors.
• Multiple load balanced servers deliver the content. Indexing an individual server would defeat the purpose of using load balancing. (There are better ways to load balance than having multiple server names, though.)

The “canonical” meta tag

How can you keep the short URL in the index and still transfer link equity? In summer 2008, we started observing that Google somehow “merged” related URLs and treated them as a single entity, showing identical page rank and identical number of inbound links to all of the URLs.

When Google introduced the “canonical” meta tag in February 2009, this suddenly made sense. Once multiple URLs are known to refer to the same page, or a slight variation of a page, the index only needs to keep one instance of the page.

The canonical meta tag helps the webmaster of a site who give search engines a hint about the preferred URL. The canonical meta tag also helps search engines since mapping multiple crawled URLs to the same page and indexing it only once just became easier.

Whether link equity fully transfers between multiple URLs mapped to the same page remains to be seen. At least within the same domain, this unification process may allow keeping the vanity URL in the index with a 302 redirect response while still transferring link equity.

PS. For an excellent and detailed description how redirects work, how to configure your Web server and what each status code does, see Sebstian's pamphlet The anatomy of a server sided redirect: 301, 302 and 307 illuminated SEO wise.

Labels: networking, seo, webdevelopment

No, we didn't get the distances wrong. Granted, Wiener Neustadt is about 60 km from Vienna whereas the distance to Jesolo is 600 km.

We left home in the dusk on July 1 with our van fully loaded, expecting to reach our vacation destination Jesolo by noon. Shortly after we had passed Wiener Neustadt, we noticed strange sounds under the hood, and the engine temperature started to rise quickly. “Stop engine. Oil pressure low.” destroyed our hope to reach at least a service station.

The towing service arrived promptly, we squeezed two child seats and ourselves into the tow truck and still hoped for a quick repair. The mechanic who first inspected our car suspected a more serious problem, and an hour later we had the sad certainty: our VW Sharan had suffered from a broken connecting rod and subsequent damage to the engine at less than 7000 km, “a manufacturing defect”. We would certainly not continue our journey with this car.

We weren't ready to give up, though. After all we had made travel arrangements, and the kids were excited about our first vacation trip abroad. Volkswagen offers a Mobility Guarantee, which sounds like you would retain your mobility when your car breaks down. It includes free roadside assistance and towing, which was indeed helpful, and a replacement vehicle of Volkswagen's choice for three days. Subject to availability, that is. Three days wouldn't helped much anyway but the rental car partner mentioned they had no large vans available for the rest of the year (mind you, this was on July 1!) and actually had no cars available at all, not even for an hour to drive to the airport to pick up another car. As good as the mobility guarantee sounds, it was pretty useless when we needed it.

It's summer time and most car rental companies were short on cars. In the end we managed to arrange for a reasonable large Opel Zaphira with the help of a wonderful agent at weekrent.com and I took the train back to Vienna to get the car. Meanwhile Andrea stayed at the dealership with two tired kids, not a good way to start a holiday.

We left Wiener Neustadt in the afternoon and arrived in Jesolo late at night, tired but glad that we made it after all.

Labels: personal, travel

For two decades, the European Union carefully regulated the size and shape of fruit. Often this has been quoted, and rightly so, as an example of the over-regulation by the commission.



Announced in November 2008, the return of the curvy cucumber will become effective on July 1, 2009. Now all those cucumbers and carrots will be “allowed” to grow in all shapes and sizes again (not that they cared too much about EC directives anyway).

Standards usually make life convenient. Just imagine what driving a rental car would be like if manufacturers implemented their own concept of speed and steering controls (too bad that other controls like air condition and radio aren't standardized and often not self-explanatory). Or withdrawing money from the bank without standardized bank cards and ATMs. Or connecting to networks if they weren't all using the same protocols.

Regulating the size and shape of fruit and vegetables, on the other hand, doesn't make life more convenient unless you like to see the cucumbers lined up nicely in the fridge. To me, this is mostly an indication of an unhealthy desire to control everything, including Mother Nature. More than two decades ago, the movement which eventually became the Green party started questioning large technology projects, be it nuclear power plants or ecologically questionable hydropower plants. Many of the environmental and energy related issues still need to be addressed. But, at least we have the curvy cucumber back.

Labels: business, technology

The disputed presidential elections in Iran reminded me of an observation a few weeks ago when the European Union held elections for the European Parliament.

Absentee voting, and mail voting in particular, present some interesting security and privacy challenges. For the European election, voters who wanted to cast their vote outside of their electoral district could request absentee ballots to vote in other districts or by mail. In a commendable effort to make voting as convenient as possible, the administration only required name, address and passport number for requesting absentee ballots and delivered them to voters by regular mail, leaving ample room for misuse already.

But I was unpleasantly surprised when I found a sticker(!) on my mailbox indicating that “important electoral mail” had been delivered:



Well intended for sure, but in my opinion the service orientation really went overboard here. With all the trust in the administration, the electoral process and the people in our neighborhood, privacy and security concerns should be considered.

Labels: austria, security

When it comes to usability, disagreeing with Jakob Nielsen is usually not an option. After all, he has been called king, czar, guru or Web usability for a reason, and his Alertbox offers invaluable advise most of the time.

Disagreeing with Jakob Nielsen on security is easier, especially when he advocates to remove password masking as a means to improve usability and claims that this doesn't lower security.

While not offering a high degree of protection, the password masking does a pretty good job for most situations. Certainly, a determined and skilled criminal would be able to observe which keys are pressed, or use other attack vectors to intercept my Web interactions. I am often surrounded by trustworthy people who still shouldn't know my passwords, don't care about my passwords and even politely turn their eyes away while I am logging in. Whether showing someone a Website or doing a demo to a larger audience, accessing protected areas of a site in a semi-public environment like a desk-sharing area at work or logging in from a mobile device, those little stars or dots protect my passwords well from becoming exposed.

Security and usability should not be conflicting objectives; in fact usability is an important aspect for any security system, or users will work around usability issues and use it in unintended ways, like copying and pasting passwords from a text file as Nielsen mentions. An extra checkbox to enable password masking just adds complexity to the user interface and may confuse users more than not being able to see their password.

Typing passwords on mobile devices (or foreign keyboards, for that matter) can be challenging. Some smartphones like the iPhone or the Nokia N95 show the letter as typed but then quickly replacing it with an asterisk, which is a reasonable compromise.

Instead of cluttering Web forms with additional checkboxes, web developers should demand that browsers and mobile devices provide an option to remove password masking when desired by the user. This would maintain the current level of security by not exposing the passwords to people looking over users' shoulders and address the usability issue for those who have difficulty typing their password and would benefit from visual feedback.

Until then, use this JavaScript bookmarklet to unmask password fields as needed:

for(var i=0;(var a=document.getElementsByTagName("input")[i]);i++){
  if(a.getAttribute("type").indexOf("password")!=-1){
    a.type="text"
  }
}
window.focus();

(all on one line, or simply drag the Unmask passwords bookmarklet link to your bookmarks).

PS. More ways to reveal passwords in a controlled manner can be found in Martin Brinkmann's blog post Reveal your saved Passwords in Firefox.

Labels: technology, usability, webdevelopment

Just in time for the World Environmental Day 2009, this morning a colleague shared an amazing animation showing air traffic over a 24 hour period:



Every yellow dot represents a flight with at least 250 passengers.

The animation was developed by the ZHAW Zürcher Hochschule für Angewandte Wissenschaften in cooperation with the Swiss science center Technorama (Larger version of the Air Traffic Worldwide video from ZHAW).

Watching this it becomes clear how even smallest improvements in fuel efficiency, reduction of emissions and optimization of flight patterns reduce the environmental impact (not that flying or most other forms of transportation will ever become eco-friendly). Smart traffic and transportation is also a theme in IBM's Smarter planet initiative.

So what did I do on World Environmental Day 2009? Nothing special, I used public transport as I do whenever possible, looked for local, organically grown food when doing my grocery shopping at the Naschmarkt (although a recent study suggests that shipping fruits and vegetables from warmer countries like Spain may be better environmentally than growing them in greenhouses locally, so much for trying to do the right thing), separated my waste—and calculated my ecological footprint at ecologicalfootprint.com and myfootprint.org, a great reminder how many of us use an above average share of natural resources.

Labels: travel

Posted by Klaus Johannes Rusch @ 3:17 AM 0 Comments
Link: http://klausrusch.atmedia.net/blog/2009/06/world-environmental-day-2009.html

I recently hacked a few lines of JavaScript for an online survey. The script looked fairly straightforward and worked well on Firefox in no time.

Fortunately I had just received a new ThinkPad (more about that later) and hadn't upgraded Internet Explorer yet. Testing with IE6, my code failed miserably. Debugging with the indispensable FireBug light tool revealed that a shared library function for accessing meta information didn't return any information. The very same library function was working nicely on the production Web site, though; at least we hadn't heard any complaints, which given the percentage of users accessing our Web site with IE6 was highly unlikely.

Staring at the screen in disbelieve, our resident jQuery guru eventually found the culprit. Unlike with the infamous Undefined is null or not an object problem, it was not an issue with an extra comma this time.

Rather, IE6 seems to get the structure of documents containing a base tag wrong, making subsequent meta and link elements children of the base element, turning this source



into this DOM tree:



So the selector which was correctly looking for html > meta would fail in the rare presence of a base tag, such as on a test page created by yours truly. The quick fix was a slightly less efficient selector html meta, and we were once again painfully reminded that IE6 tends to behave differently from current browsers and requires separate testing.


Related information:

• Justin Rogers, BASE tag changes in IE 7 with Examples

Labels: javascript, webdevelopment, windows