What are HTTP status codes?

[rifat28dddd]

Screenshot of the "404 Page Not Found" error message from marvel.com

What are 404 pages?
A 404 page is an error message. “404” stands hong kong cell phone number list for the HTTP status code 404: Not Found . A 404 page is always displayed when

the domain exists
but not the requested subpage
Whenever you access a page through a browser, the browser sends a request to the website's server. This communication between browser and server is carried out via HTTP (Hyper Text Transfer Protocol). The server then delivers two things, if possible:

the contents of the page or a predefined alternative (404 page or redirect)
the status of the requested page as an HTTP status code
e.g. 200: OK , 301: Redirected , or 404: Not Found
SEO tipIn the SEO Compass you will find an overview of the most important HTTP status codes for SEO .

Where does error 404 come from?
As mentioned above, 404 pages occur whenever no content can be found at a given URL. This can happen for several reasons. Here are some examples: