3XX, 4XX, 5XX HTTP Status Code in best practices

This article is about HTTP Status Code. HTTP status code indicate whether a specific HTTP request has been successfully completed. Each group contains a lot of different responses, on this page you will find an overview of the most common HTTP status codes. Responses are grouped in five classes: informational responses, successful responses , redirects, client errors, and server errors.

3XX, 4XX, 5XX HTTP Status Code in best practices 1

The message that accompanies a server status response code doesn’t matter for clients. Most clients rely only on the status code ‘number’ itself. A message should be seen as a recommendation and it is not required the client should examine them.

The status message may differ by HTTP version or even between different RFC documents for the same HTTP version. And with the introduction of HTTP/2, the protocol does not contain a status message or reason at all.

HTTP Status Code:-

400 Bad Request:-
This is an error code indicates that the user’s request contains incorrect syntax.

401 Unauthorized:-
This is an error code indicates that the requested file requires authentication (a username and password).

403 Forbidden:-
This is an error code indicates that the server will not allow the visitor to access the requested file. If a visitor receives this code unexpectedly, you should check the file’s permission settings, or check whether the file has been protected.

404 Not Found:-
This is an error code indicates that the server could not find the file that the visitor requested. This commonly occurs when a URL is mistyped.

500 Internal Server Error:-
This is an error code indicates that the server has encountered an unexpected condition. This often occurs when an application request cannot be fulfilled due to the application being configured incorrectly on the server.

501 Not Implemented:-
This is an error code indicates that the HTTP method sent by the client is not supported by the server. This is most often caused by the server being out of date. It is a very rare error and generally requires that the web server be updated.

502 Bad Gateway:-
This error is usually due to improperly configured proxy servers. However, the problem may also arise when there is poor IP communication between back—end computers, when the client’s server is overloaded, or when a firewall is
functioning improperly.The first step in resolving the issue is to clear the client’s cache. This action should result in a different proxy being used to resolve the web server’s content.

503 Service Unavailable:-
This error occurs when the server is unable to handle requests due to a temporary overload or due to the server being temporarily closed for maintenance. The error indicates that the server will only temporarily be down. It is
possible to receive other errors in place of 503.Contact the server administrator if this problem persists.

504 Gateway Timeout:-
This is an error code which occurs when a server somewhere along the chain does not receive a timely response from a server further up the chain. The problem is caused entirely by slow communication between upstream computers.
To resolve this issue, contact the system administrator.

505 HTTP Version Not Supported:-
This is an error code which occurs when the server refuses to support the HTTP protocol that has been specified by the client computer. This can be caused by the protocol not being specified properly by the client computer; for example, if an invalid version number has been specified.

506 Variant Also Negotiates:-
This is an error code which indicates that the server is not properly configured. Contact the system administrator to resolve this issue.

507 Insufficient Storage:-
This is an error code which indicates that the server is out of free memory. This is most likely to occur when an application that is being requested cannot allocate the necessary system resources to run.
To resolve the issue, the server’s hard disk may need to be cleaned of any unnecessary documents to free up more hard disk space, its memory may need to be expanded, or it may simply need to be restarted.
Contact the system administrator for more information regarding this error message.

509 Bandwidth Limit Exceeded:-
This is an error which occurs when the bandwidth limit imposed by the system administrator has been reached. The only fix for this issue is to wait until the limit is reset in the following cycle.
Consult the system administrator for information about acquiring more bandwidth.

510 Not Extended:-
This is an error which occurs when an extension attached to the HTTP request is not supported by the web server.
To resolve the issue, you may need to update the server. Consult the system administrator for more information.

 

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