HTTP

HTTP or HyperText Transfer Protocol. HTTP is the standard protocol used to transfer digital media (including written text, videos, images, and so on) over the internet. The whole internet – or World Wide Web (WWW) – is actually billions of interconnected hypertext documents.
There’s a range of HTTP status codes you’ll often see displayed if your browser is unable to load the page you were looking for. The most common codes are:

• 404 – File Not Found (displayed if the server can’t find the file that’s been requested)
  
• 403 – Forbidden (displayed when you’re trying to access a page or asset that you don’t have permission to access
  
• 301 – Moved Permanently (commonly referred to as a “301 redirect,” this will direct your browser to the new, permanent location of the page or asset)
  
• 500 – Internal Server Error (displayed whenever there’s an unexpected server error – try refreshing the page, that sometimes fixes the problem!)
  
• 503 – Service Unavailable (displayed when there’s a temporary problem with the server, particularly if a website has exceeded its bandwidth limits or the server is overloaded with traffic at that moment)