SEO HTTP Response Codes List

First will know the abbreviation of HTTP, HTTP stands for Hypertext Transfer Protocol. These HTTP codes are in 3 digit numeric number. Generally, HTTP is a TCP/IP based communication protocol, it is used to deliver the HTML, Images and Query Result files etc. on the World Wide Web.

These HTTP Response Codes are communicate between you and servers on the internet, i.e browsers sends a request to a server for the information. These requests might be images, videos, files and etc, this is called HTTP request. When a server receives that request, it sends back an HTTP Response, with information for the You/Browsers.

Here are the common HTTP Response Codes are,

2xx: Success It means the action was successfully received, understood, and accepted.

3xx: Redirection It means further action must be taken in order to complete the request.

4xx: Client Error It means the request contains incorrect syntax or cannot be fulfilled.

5xx: Server Error It means the server failed to fulfill an apparently valid request.

HTTP Status Codes for SEO and Search Engines

200 OK

The request has succeeded. This is considered correct for most scenarios.

301 Moved Permanently

The requested resource has been assigned a new permanent URI and any future references to this resource should use one of the returned URIs. The 301 redirect, as it is commonly called by SEOs, should be utilized any time one URL needs to be redirected to another.

302 Found

A status code of 302 tells a client that the resource they asked for has temporarily moved to a new location. The response should also include this location. It tells the client that it should carry on using the same URL to access this resource.

403 - Forbidden

A 403 status code indicates that the client cannot access the requested resource. That might mean that the wrong username and password were sent in the request, or that the permissions on the server do not allow what was being asked.

404 File Not Found

The best known of them all, the 404 status code indicates that the requested resource was not found at the URL given, and the server has no idea how long for.

410 - Gone

A 410 status code is the 404's lesser known cousin. It indicates that a resource has permanently gone (a 404 status code gives no indication if a resource has gine permanently or temporarily), and no new address is known for it.

500 Server Error

Server Error: Valid request was made by the client, but the server failed to complete the request.

503 - Service Unavailable

A 503 status code is most often seen on extremely busy servers, and it indicates that the server was unable to complete the request due to a server overload.

External Sources:

https://moz.com/learn/seo/http-status-codes

https://www.addedbytes.com/articles/for-beginners/http-status-codes/

http://www.tutorialspoint.com/http/http_status_codes.htm