Programming

Customizing Apache Directory Listings with .htaccess

I was clearing off my desk today when I found an article I've been meaning to scan and send to somebody -- the story of how my friends almost elected a dalmatian and squirrel to the homecoming court of the University of North Texas in 1989. The alumni magazine wrote a feature on Hector the Eagle Dog and Agnes the Squirrel's campaign, which attracted national media and made a few of the human homecoming candidates very angry. I can never tell when a file's too big to send in email without ... (read more)

2008/11/26

Sharing Bookmarks and Feed Lists with XML

I'm working on a programming project that requires an XML format to represent bookmarks and other collections of URIs, but before I reinvent the wheel I'd like to see if there's an existing format that meets my goals. The format should be able to hold all of the following information: Bookmarks in web browsers Links in web directories like the Open Directory Project Feeds in an OPML subscription list Social bookmarks in Delicious There are several potential formats that could be put to use: ... (read more)

2008/11/25

New Comment Pages Added to Workbench

I spent a little time this morning improving the comment system on Workbench. There's now a comments page that shows the 50 most recent comments submitted to the weblog. After you submit a comment here, the site will store your name and home page link in cookies for 180 days so you don't have to type them in again. I've also added a line to the site's moderation policy: "Comments that have nothing to do with the subject of a post will be deleted." There's too much off-topic noise here. I'm not ... (read more)

2008/09/18

Adding ReCaptcha to a Weblog

I've added a ReCaptcha component to the comment form on Workbench to deter spammers. The ReCaptcha system presents two hard-to-read words that must be typed in successfully for a comment to be saved. Here's what the component looks like: I tried as long as possible to avoid using captchas, but the amount of spam hitting this blog continues to grow, particularly from foreign IP addresses. Workbench has received 16,000 comments and more than 260,000 spam since it began accepting comments in 2002. ... (read more)

2008/08/14

SiteMeter Crashes Internet Explorer with 'Operation Aborted'

Last night several of my web sites, including the Drudge Retort, began crashing Internet Explorer with the error message "Internet Explorer cannot open the Internet site ... Operation aborted." I've encountered this error before, and when it occurs out of the blue on a site you haven't changed, the culprit is usually a problem with third-party Javascript code, as CNet's Clientside blog explains: IE does this when you attempt to modify a DOM element before it is closed. This means that if you ... (read more)

2008/08/02

Displaying Twitter Updates on a Web Page

I recently began using Twitter, a microblogging service for posting short, chat-like blog entries and reading what other users of the service are doing. The site has severe reliability problems, but it's still an entertaining way to get real-time updates from bloggers I read along with others I know who've been sucked into Twitter's maw. I wrote some code to display my most recent Twitter update on my weblog, Workbench, in a sidebar at upper right. This afternoon, I've released the ... (read more)

2008/07/08

Following Web Page Redirects with Java

CNET moved a bunch of its blogs to a different domain this weekend, including Beyond Binary, Coop's Corner, Geek Gestalt, One More Thing, Outside the Lines and The Social. I mention this because the change hosed Meme13, which treated all six as if they were newly discovered sites. One of my ground rules for developing Meme13 is that I won't hand-edit the site to make it smarter. I need the application to recognize when existing sites in its database have moved. Meme13 monitors sites using a ... (read more)

2008/05/25

Setting the Link on a ShareThis Widget

I'm continuing to work on Meme13, a site that packages together the last 13 sites to show up on the Techmeme Leaderboard so they can be sampled as a feed or web site. The site has attracted around 25 RSS subscribers in its first month. I've added a ShareThis widget on each entry that makes it easy to share content from Meme13 on sites like De.licio.us, Digg and Facebook. Normally, ShareThis links to the page the widget has been displayed on. That doesn't suit my purposes on Meme13, because I'm ... (read more)

2008/05/19

How to Crash Your Apache Server with PHP

I returned from a trip out of town Monday to crashing web servers that ate my lunch all week long. For several days, I used the top command in Linux and watched helplessly as two servers ground to a halt with load averages higher than 100. Top reports the processes that are taking up the most CPU, memory and time. On the server running Workbench, the culprit was always httpd, the Apache web server. This didn't make sense, because Apache serves web pages, images, and other files with incredible ... (read more)

2008/05/02

Twitter: Where Ruby on Rails Goes Off the Track

An article posted on eWeek today was written in an alternate universe where Twitter works: As the maker of one of the largest applications using Ruby on Rails on the Web, Twitter knows a thing or two about scaling applications built with the popular development framework. Britt Selvitelle, a senior engineer at Twitter, offered a few tips and tricks for scaling Ruby on Rails and expressed particular appreciation for the Rails framework itself and the language is it based on, Ruby. "For us, for a ... (read more)

2008/05/01

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