Sometimes when you enter or request for some service or website, server displays some error like '404 Page not found'. You might be wondering that why such errors occurs and what does it mean ? So here is the description of why such error occurs :

400 – Bad Request

The 400 Bad Request error occurs when the request which you have sent to the website server was incorrect or corrupted and the server is unable to understand and process it.

401- Authentication Error

401 authentication error means the page you were trying to access cannot be loaded, the reason may be the credentials ( Username/ UserID or Password) that you have entered for login is invalid or incorrect.

403 – Forbidden

403 Forbidden error occurs when you request to access webpage, directory, file or script without appropriate permission, the server understood the request but cannot fulfill or allow.

404 – Not Found

404 Not Found error occurs when the server has not found anything for the URL you entered or may be that URL doesn’t exist or missing files.

500 – Internal Server Error

500 Internal Server Error is a very general error that occurs when something wrong has done on the website’s server but the server itself is not much specific to what exactly happen.

501 – Not Implemented

Generally, 501 – Not Implemented error occurs when the server doesn’t support the functionality to process the request that you have entered.

503 Service Unavailable

503 Service Unavailable error means that the website server is not available right now, may be due to maintenance of the server or temporarily overloading. And this server error is a temporary condition which will be solved in some time.

Server Error 5xx

Server Error 5xx occurs when the server is unaware of the error or is incapable of performing the request that you have entered.

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