HTTP (Hypertext Transfer Protocol) is the foundation of data communication for the World Wide Web. It is a protocol for transmitting information over the internet, and it defines a set of rules for transmitting data between clients and servers. HTTP uses status codes to indicate the outcome of a request. The status codes are grouped into five classes, each with its own range of codes. In this article, we will explain each HTTP protocol status code in detail.

1xx: Informational

This class of status codes provides information about the request's progress. The most common status code in this class is 100 "Continue", which indicates that the client should continue with its request.

2xx: Successful

This class of status codes indicates that the request was successful. The most common status codes in this class are:

200	OK	The request was successful, and the server has returned the requested information.
201	Created	The request was successful, and the server has created a new resource as a result.
202	Accepted	The request was accepted for processing, but the processing has not been completed yet.
204	No Content	The request was successful, but there is no representation to return (e.g., a DELETE request).

3xx: Redirection

This class of status codes indicates that further action is required by the client to complete the request. The most common status codes in this class are:

301	Moved Permanently	The requested resource has been permanently moved to a new location. The client should use the new location in future requests.
302	Found	The requested resource is temporarily located at a different URI. The client should continue to use the original URI in future requests.
304	Not Modified	The client already has a cached copy of the requested resource and the server confirms that it has not been modified since the cached copy was created.
308	Permanent Redirect	The requested resource has been permanently moved to a new location, and future requests should use the new location.

4xx: Client Error

This class of status codes indicates that the request from the client was incorrect or cannot be fulfilled by the server. The most common status codes in this class are:

400	Bad Request	The request from the client was incorrect, and the server cannot fulfill it.
401	Unauthorized	The client is not authorized to access the requested resource.
403	Forbidden	The client is not authorized to access the requested resource, and the server will not provide a reason for the denial.
404	Not Found	The requested resource could not be found on the server.
405	Method Not Allowed	The requested method is not allowed for the specified resource.

5xx: Server Error

This class of status codes indicates that an error occurred on the server while processing the request. The most common status codes in this class are:

500	Internal Server Error	An error occurred on the server while processing the request.
502	Bad Gateway	The server received an invalid response from an upstream server while processing the request.
503	Service Unavailable	The server is currently unable to handle the request due to maintenance or capacity problems.
504	Gateway Timeout	The server did not receive a timely response from an upstream server while processing the request.

In conclusion, understanding HTTP status codes is a crucial aspect of web development and network administration. It is important to stay up-to-date with the latest developments in this field, and to continually refine one's knowledge and skills in this area. With the right understanding and expertise, web developers and network administrators can ensure the success of their web applications and websites, and provide their users with a seamless, seamless experience.

Web Architecture

A Comprehensive Guide to Understanding HTTP Protocol Status Codes