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Question: What are the HTTP response code blocks and what do they mean?

Answer: After a request is sent to a server, there are different possible response codes which can be returned by the server:

The blocks are:

2xx for Success, the most common one is 200 which means “OK”.
3xx for Redirection, the most common ones are 301 and 303 which mean “Permanent Redirect” and “Redirect for Undefined Reason”, respectively.
4xx for Application Error, the most common ones are 403 and 404 which mean “Forbidden” and “Not Found”, respectively.
5xx for Server Error, the most common one is 500 which means “Server Error”.

After a request is sent to a server, there are different possible response codes which can be returned by the server:

The blocks are:

2xx for Success, the most common one is 200 which means “OK”.
3xx for Redirection, the most common ones are 301 and 303 which mean “Permanent Redirect” and “Redirect for Undefined Reason”, respectively.
4xx for Application Error, the most common ones are 403 and 404 which mean “Forbidden” and “Not Found”, respectively.
5xx for Server Error, the most common one is 500 which means “Server Error”. Source: CoolInterview.com

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