HTTP Status Codes & URL

The HTTP status codes belong to different families, depending on their first digit.

Family	Meaning	Examples
1xx	Information
2xx	Success	200: request handled successfully
3xx	Redirection
4xx	Client Error	404: resource not found
5xx	Server Error	500: internal server error

For a more in-depth presentation of the HTTP protocol, head over to the Mozilla Developer Network.

Addressing a resource with a URL

Web sites are usually accessed using their address, a piece of text of the form http://www.mywebsite.com/myresourcepath/myresource. This address can be split into several subparts

• http:// means an access through the HTTP protocol.
• www.mywebsite.com is the domain name of the web site.
• /myresourcepath/myresource is the path of the requested resource.

An address like this one is called a URL, or Uniform Resource Locator. A URL uniquely describes a web resource and the way to request it.