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Configuring and Administering Your Server >>
Fixing a HTTP Error 500 - Internal Server Error
"For people who make websites" - A List Apart Magazine explores the design, development, and meaning of web content, with a special focus on web standards and best practices.
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen in the form of an icon in the status bar when browsing. The details of the errors are seen when looking the HTML source of the page.
The extension is based on Tidy and OpenSP. Both algorithms were originally developed by the Web Consortium W3C. Both algorithms are embedded inside Mozilla/Firefox and makes the validation locally on your machine, without sending HTML to a third party server.
The extension is based on Tidy and OpenSP. Both algorithms were originally developed by the Web Consortium W3C. Both algorithms are embedded inside Mozilla/Firefox and makes the validation locally on your machine, without sending HTML to a third party server.
This project aims to create an archive of user contributed clip art that can be freely used.
Starting at the beginning, this reference explains everything you need to know about using core JavaScript. It assumes you have the following basic background: a general understanding of the Internet and the World Wide Web and a good working knowledge of HTML. An excellent resource.
Edit your images on the fly online with Splashup, a web-based image editor that integrates with Flickr, Facebook, and Picasa. Splashup offers up a surprising array of image editing tools, far beyond the usual crop of resize and contrast-- you can also edit multiple images, play with filters and layers, use a variety of brushes, and more. Splashup is one of the best image editors in a long line of image editors; i.e., Picnik, Pixoh, and Resizr, to name just a few.[Lifehacker Annotation]
This website will let you:
- Create an XML sitemap format that can be submitted to Google to help them crawl your website better.
- Create a Text sitemap to submit to Yahoo.
- Create a ROR sitemap, which is an independant XML format for any search engine.
- Generate an HTML site map to allow human visitors to easily navigate on your site.
Clearspring's free Launchpad widget builder lets you easily turn your website's content into a widget which site visitors can use to place your content on all the major social media sites (MySpace, FaceBook, Google, hi5, Live, Yahoo, Wordpress, Blogger, etc.). The service also provides tracking and analysis.
This site features online text and html changing, modifying, converting tools designed to save you time making web pages or preparing text for web publication. If you've ever needed to capitalize sentences or convert line breaks to <p> or <br /> then this site can save you needless manual labor. There are other useful tools as well, like the one to uncompress html to make it readable and the ones to uppercase or lowercase text. Basically, the most common tasks that someone who works in an office or does freelance web development might encounter. Most of the tools have been created using javascript so you should be able to change large amounts of text as the processing is done on your computer instead of being limited by a server script.
You've downloaded and configured your Apache server and are ready to move on to the next project. Can it really be left to fend for itself in a darkened room?
Yes. To some degree, anyway. On the other hand, completely ignoring your Apache installation would be foolhardy.
Yes. To some degree, anyway. On the other hand, completely ignoring your Apache installation would be foolhardy.
The Wikipedia entry for Sender Policy Framework (SPF).
The Wikipedia entry for DomainKeys.
Useful Resources
View all resources
Editor Favorites
- A List Apart
- HTML Validator Firefox Plugin
- Open Clip Art Library
- Core JavaScript Guide: Version 1.5
- Splashup
- XML Sitemaps Generator
- Clearspring Launchpad
- Text Fixer
Other Resources
Links to Consider
The 500 Internal Server Error is a very general HTTP status code that means something has gone wrong on the web site's server but the server could not be more specific on what the exact problem is. When you receive such an error on your site, a good place to start your troubleshooting is with the error log, which can usually be accessed easily from your administrative panel (cPanel, Plesk, etc.). By looking at the most recent entries, you'll probably get an idea of what might be going on. From my personal experience and from some basic online research, typically one of three causes can be identified:
- File/directory permissions: These errors can be easily fixed by changing the permissions of the file or directory in question (via FTP program, file manager in your control panel, secure shell access, etc.). Usually, setting to 755 will do the trick.
- .htaccess problems: your .htaccess file could have a permission error (see above) or, more likely, it could be performing some odd redirect behaviors (e.g., an endless loop). This becomes more likely when you start using regular expressions. Note: I also read about people having problems with redirects that were caused by their server's httpd.conf file not being configured properly.
- Premature end of script headers: this type of error could be caused by a couple of things: (1) the script requires more than the usual time to be processed and is being killed by our system; (2) there is an error within the programming code of the script in question.
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