A SSL certificate is a way to encrypt a site's information and create a more secure connection. Additionally, the certificate can show the virtual private erver's identification information to site visitors. Certificate Authorities can issue SSL certificates that verify the server's details while a self-signed certificate has no 3rd party corroboration.

Colony graphs are a simple visualization of computer life forms. A process colony graph, or "ptree graph" for short, shows live processes and their parent and child relationships.

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A curated list of amazingly awesome open source sysadmin resources inspired by Awesome PHP.

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Python's SimpleHTTPServer is a great way of serve the contents of the current directory from the command line:

python -m SimpleHTTPServer

However, as far as web servers go, it's very slooooow...

-> npm install http-server -g

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A set of small, responsive CSS modules that you can use in every web project.

Web server in go

php -S 127.0.0.1:8080

Facebook Notes allows users to include <img> tags. Whenever a <img> tag is used, Facebook crawls the image from the external server and caches it. Facebook will only cache the image once however using random get parameters the cache can be by-passed and the feature can be abused to cause a huge HTTP GET flood.

There are many classic tech debates, and the question of what to formally call web addresses is one of the most nuanced. The way this normally manifests is someone asks for the "URL" to put into his or her browser, and someone perks up with,

Actually, that's called a URI, not a URL...

The response to this correction can range from quietly thinking this person needs to get out more, to agreeing indifferently via shoulder shrug, to removing the safety clasp on a Katana. This page hopes to serve as a simple, one page summary for navigating the subtleties of this debate.

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Have you ever wondered how Facebook is able to automatically display your Instagram photos? How about how Evernote syncs notes between your computer and smartphone? If so, then it’s time to get excited!

In this course, we walk you through what it takes for companies to link their systems together. We start off easy, defining some of the tech lingo you may have heard before, but didn’t fully understand. From there, each lesson introduces something new, slowly building up to the point where you are confident about what an API is and, for the brave, could actually take a stab at using one.

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